WO2013073008A1 - Sound output device and output sound control method - Google Patents

Sound output device and output sound control method Download PDF

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Publication number
WO2013073008A1
WO2013073008A1 PCT/JP2011/076295 JP2011076295W WO2013073008A1 WO 2013073008 A1 WO2013073008 A1 WO 2013073008A1 JP 2011076295 W JP2011076295 W JP 2011076295W WO 2013073008 A1 WO2013073008 A1 WO 2013073008A1
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WO
WIPO (PCT)
Prior art keywords
sound
unit
output
vehicle
source data
Prior art date
Application number
PCT/JP2011/076295
Other languages
French (fr)
Japanese (ja)
Inventor
淳一郎 渡邉
壮志 中川
雄介 高見
貴之 椎津
史雄 田村
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パイオニア株式会社
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Application filed by パイオニア株式会社 filed Critical パイオニア株式会社
Priority to PCT/JP2011/076295 priority Critical patent/WO2013073008A1/en
Publication of WO2013073008A1 publication Critical patent/WO2013073008A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L1/00—Supplying electric power to auxiliary equipment of vehicles
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K15/00—Acoustics not otherwise provided for
    • G10K15/02—Synthesis of acoustic waves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/10—Vehicle control parameters
    • B60L2240/12—Speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2250/00—Driver interactions
    • B60L2250/10—Driver interactions by alarm
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2270/00—Problem solutions or means not otherwise provided for
    • B60L2270/10—Emission reduction
    • B60L2270/14—Emission reduction of noise
    • B60L2270/142—Emission reduction of noise acoustic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones

Definitions

  • the present invention relates to a sound output device, an output sound control method, an output sound control program, and a recording medium on which the output sound control program is recorded.
  • Patent Document 1 hereinafter referred to as “conventional example”.
  • this conventional technology one type of traveling sound signal is generated based on the detection results of the vehicle speed, the rotational speed of the motor that is the power source, the accelerator opening, etc., and the traveling sound is output from the speaker to the front outside the vehicle, etc. It is supposed to be. Then, execution / non-execution of the running sound output is controlled according to the type of region in which the vehicle is running.
  • the conventional technology described above outputs an appropriate vehicle recall sound for alerting pedestrians outside the vehicle.
  • the vehicle-like sound output to the outside of the vehicle leaks into the vehicle interior. Since such vehicle recall sound is an artificial sound, if the vehicle recall sound continues to leak into the passenger compartment, the passenger may feel uncomfortable.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a new sound output device and an output sound control method capable of optimizing the vehicle recall sound with respect to the inside and outside of the vehicle. To do.
  • a supply unit that generates and supplies an external output sound signal to an external sound output unit that outputs sound toward the outside of the vehicle; and output from the external sound output unit
  • a level detection unit that detects a sound pressure level of an audible band of leaked sound leaked into the vehicle interior of the vehicle later; and generation of the external output sound signal by the supply unit based on a detection result of the level detection unit
  • a control unit that controls the sound output device.
  • a supply unit that generates an external output sound signal and supplies the external output sound signal to an external sound output unit that outputs sound toward the outside of the vehicle; and the external output sound signal by the supply unit
  • An output sound control method used in a sound output device comprising: a control unit that controls generation of sound; and an audible leak sound leaked into a vehicle compartment of the vehicle after being output from the external sound output unit A level detection step of detecting a sound pressure level of the band; and a control step of controlling the generation of the external output sound signal by the supply unit based on a detection result in the level detection step.
  • the present invention is an output sound control program characterized by causing an arithmetic unit to execute the output sound control method of the present invention.
  • the present invention is a recording medium in which the output sound control program of the present invention is recorded so as to be readable by a calculation unit.
  • FIG. 4 It is a block diagram for demonstrating the structure of the sound output device which concerns on 1st Embodiment of this invention. It is a block diagram for demonstrating the structure of the sound output device which concerns on 2nd Embodiment of this invention. It is a block diagram for demonstrating schematically the structure of the sound output device which concerns on one Example of this invention. It is a figure for demonstrating the content of the sound source information of FIG. It is a figure for demonstrating the content of the sound source data of FIG. 4 is a flowchart for explaining reference sound source data identification processing and reduction rate information determination processing in the apparatus of FIG. 3.
  • FIG. 1 shows a schematic configuration of a sound output device 700A according to the first embodiment.
  • the sound output device 700A is mounted on an electric vehicle MV (hereinafter referred to as “vehicle MV”), and is connected to an external sound output unit 790 and a sound collection unit 795. .
  • vehicle MV electric vehicle MV
  • the external sound output unit 790 includes a speaker.
  • the external sound output unit 790 receives the external output sound signal sent from the sound output device 700A. Then, the external sound output unit 790 outputs a sound according to the external output sound signal toward the outside of the vehicle MV.
  • the sound collection unit 795 is configured to include a microphone disposed in the vehicle interior of the vehicle MV.
  • the sound collection unit 795 collects sound that has reached the microphone.
  • the sound collection result by the sound collection unit 795 is sent to the sound output device 700A.
  • the sound output from the external sound output unit 790 is substantially the result of collecting the leaked sound that has leaked into the vehicle interior of the vehicle MV.
  • the sound output device 700A includes a storage unit 710 and a level detection unit 720.
  • the sound output device 700 ⁇ / b> A includes a control unit 740 and a supply unit 750.
  • the storage unit 710 has a nonvolatile storage area.
  • the storage unit 710 can be accessed by the supply unit 750.
  • a plurality of sound source data related to the vehicle recall sound output from the external sound output unit 790 while the vehicle MV is traveling is stored.
  • Each of these sound source data is composed of a plurality of sound data.
  • the plurality of sound data is time-series data, and a sound waveform is formed by arranging the plurality of sound data in time sequence. Each of the plurality of sound source data is different from each other.
  • the “vehicle recall sound” is a sound that can notify a pedestrian or the like of the presence of the vehicle MV.
  • “vehicle recall sound” includes pseudo engine sound, sine waveform sound, and the like.
  • the sound pressure level of the “vehicle recall sound” is adjusted by the supply unit 750 so as to be an appropriate sound pressure level as a warning sound for a pedestrian or the like.
  • the level detection unit 720 receives the sound collection result from the sound collection unit 795. And the level detection part 720 analyzes the said sound collection result, and detects the sound pressure level of the audible band of the leak sound into a vehicle interior. The level detection result by the level detection unit 720 is sent to the control unit 740.
  • the control unit 740 controls generation of an external output sound signal by the supply unit 750.
  • the control unit 740 is supplied prior to the control of the generation of the external output sound signal (that is, the vehicle evoked sound signal) while the vehicle MV is traveling on the assumption that the vehicle MV exists in a silent environment.
  • the unit 750 causes the external output sound signal corresponding to each of the plurality of sound source data stored in the storage unit 710 to be sequentially generated.
  • the control part 740 receives the level detection result sent from the level detection part 720 sequentially.
  • Sound source data (hereinafter referred to as “reference sound source data”) is specified from a plurality of sound source data in the storage unit 710.
  • control unit 740 provides an external corresponding to the identified reference sound source data to the supply unit 750 prior to the control of the generation of the vehicle recall sound signal. An output sound signal is generated.
  • the control unit 740 receives the level detection result sent from the level detection unit 720.
  • the control unit 740 analyzes the level detection result sent from the level detection unit 720 during the output of the external output sound corresponding to the reference sound source data, and the frequency band in which the sound pressure level is equal to or higher than a predetermined value, and The sound pressure level distribution in the frequency band is detected. Based on the detection result, the control unit 740 maintains the sound pressure level of the sound output from the external sound output unit 790 as much as possible, and outputs the external output sound corresponding to the reference sound source data to the vehicle interior.
  • the reduction rate information for causing the supply unit 750 to perform a sound pressure level reduction process for causing the leaked sound to be less than the predetermined value in the entire audible band region is determined.
  • the control unit 740 controls the generation of the external output sound signal by the supply unit 750 by designating the reference sound source data thus identified and the determined reduction rate information to the supply unit 750. Details of the control processing by the control unit 740 will be described later.
  • the supply unit 750 generates an external output sound signal with reference to a plurality of sound source data stored in the storage unit 710 according to control by the control unit 740. Further, the supply unit 750 generates an external output sound signal that has been subjected to the sound pressure level reduction process in accordance with the control by the control unit 740. The external output sound signal thus generated is sent to the external sound output unit 790.
  • Reference sound source data identification process In the process of specifying the reference sound source data, first, the control unit 740 sequentially generates external output sound signals corresponding to each of the plurality of sound source data stored in the storage unit 710 by the first time length in the supply unit 750. Therefore, a first detection signal generation control command designating one of the plurality of sound source data is sequentially sent to the supply unit 750 while changing the designated sound source data.
  • the supply unit 750 that has received the first detection signal generation control command sequentially reads the sound data included in the sound source data designated by the first detection signal generation control command from the storage unit 710. Then, the supply unit 750 sequentially outputs the read sound data at a predetermined cycle. As a result, an external output sound signal is generated. The external output sound signal thus generated is sent to the external sound output unit 790. In this way, the supply unit 750 sequentially generates external output sound signals corresponding to each of the plurality of sound source data under the control of the control unit 740.
  • the “first time length” is determined in advance based on experiments, simulations, experiences, etc. from the viewpoint of reliably and promptly detecting the maximum value of the sound pressure level of the audible band of the leaking sound into the vehicle interior to be described later. It is done.
  • the external sound output unit 790 that has received the external output sound signal outputs a sound according to the external output sound signal toward the outside of the vehicle MV. After the sound is output from the external sound output unit 790 in this way, the sound collection unit 795 collects the leakage sound that has leaked into the vehicle interior of the vehicle MV. Then, the sound collection unit 795 sends the sound collection result to the level detection unit 720.
  • the level detection unit 720 that has acquired the sound collection result analyzes the acquisition result and detects the sound pressure level in the audible band of the sound leaking into the vehicle interior. Then, the level detection unit 720 sequentially sends the level detection results to the control unit 740.
  • the control unit 740 that has received the level detection result corresponding to each of the plurality of sound source data transmitted from the level detection unit 720 has the audible band of the leakage sound among the plurality of sound source data stored in the storage unit 710.
  • the sound source data used when the maximum value of the sound pressure level is the lowest is specified as the reference sound source data.
  • the control unit 740 designates the reference sound source data in order to cause the supply unit 750 to generate the external output sound signal corresponding to the reference sound source data over the second time length.
  • a second detection signal generation control command is sent to the supply unit 750.
  • the supply unit 750 that has received the second detection signal generation control command sequentially reads sound data included in the reference sound source data from the storage unit 710. Then, the supply unit 750 sequentially outputs the read sound data at a predetermined cycle. As a result, an external output sound signal corresponding to the reference sound source data is generated.
  • the external output sound signal thus generated is sent to the external sound output unit 790. In this way, the supply unit 750 generates an external output sound signal corresponding to the reference sound source data under the control of the control unit 740.
  • the “second time length” is determined in advance based on experiments, simulations, experiences, and the like from the viewpoint of accurately and quickly acquiring a spectrum in the audible band of leaking sound into the vehicle interior, which will be described later.
  • the control unit 740 analyzes the level detection result sent from the level detection unit 720 and detects the frequency band where the sound pressure level is equal to or higher than a predetermined value and the sound pressure level distribution in the frequency band. Based on the detection result, the control unit 740 leaks into the vehicle interior while maintaining the sound pressure level of the external output sound corresponding to the reference sound source data output from the external sound output unit 790 during traveling as much as possible. Decrease rate information for causing the supply unit 750 to perform a sound pressure level reduction process for causing the sound to be less than the predetermined value in the entire region of the audible band is determined.
  • the control unit 740 specifies the reference sound source data and the determined reduction rate information specified in this way to the supply unit 750. With this designation, the waveform of the external output sound (that is, the vehicle recall sound) output from the external sound output unit 790 while the vehicle MV is traveling is controlled.
  • External output sound generation processing during running of vehicle MV In the process of generating the external output sound while the vehicle MV is traveling, the control unit 740 performs the designation for the reference sound source data identified as described above and the supply unit 750 for the determined reduction rate information. Then, a command to start generation of the vehicle recall sound signal is sent to the supply unit 750.
  • the supply unit 750 sequentially reads sound data included in the designated reference sound source data from the storage unit 710. Then, the supply unit 750 performs a sound pressure level reduction process according to the specified reduction rate information while internally outputting the read sound data sequentially in a predetermined cycle. As a result, an external output sound signal as a vehicle recall signal is generated. The external output sound signal thus generated is sent to the external sound output unit 790.
  • the external sound output unit 790 Upon receiving the external output sound signal, the external sound output unit 790 outputs the vehicle recall sound according to the signal toward the outside of the vehicle MV. As a result, the vehicle recall sound in which the sound pressure level in the audible band of the sound leaked into the vehicle interior is reduced is output outside the vehicle.
  • control unit 740 stores a plurality of data stored in the storage unit 710 with respect to the supply unit 750 prior to the generation of the external output sound signal while the vehicle MV is traveling. Control is performed to sequentially generate external output sound signals corresponding to each of the sound source data.
  • the external output sound signal generated by the supply unit 750 is sent to the external sound output unit 790, and the sound according to the signal is output toward the outside of the vehicle MV.
  • the sound collection unit 795 collects the leakage sound that has leaked into the vehicle interior of the vehicle MV.
  • the sound collection result by the sound collection unit 795 is sent to the level detection unit 720, and the level detection unit 720 detects the sound pressure level in the audible band of the leakage sound into the vehicle compartment.
  • the control unit 740 based on the level detection result by the level detection unit 720, the control unit 740 has the lowest sound pressure level in the audible band of the leaking sound among the plurality of sound source data stored in the storage unit 710. Identify the sound source data used when Subsequently, the control unit 740 designates the specified sound source data to the supply unit 750 as reference sound source data to be used while the vehicle MV is traveling.
  • control unit 740 detects a frequency band in which the sound pressure level of the external output sound corresponding to the reference sound source data is a predetermined value or more, and a sound pressure level distribution in the frequency band. Based on the detection result, the control unit 740 leaks into the vehicle interior while maintaining the sound pressure level of the external output sound corresponding to the reference sound source data output from the external sound output unit 790 during traveling as much as possible. Decrease rate information for causing the supply unit 750 to perform a sound pressure level reduction process for causing the sound to be less than the predetermined value in the entire region of the audible band is determined. Subsequently, the control unit 740 designates the determined reduction rate information to the supply unit 750.
  • the control unit 740 starts generation of the vehicle recall signal.
  • the command is sent to the supply unit 750.
  • the supply unit 750 performs a sound pressure level reduction process on the designated reference sound source data according to the determined reduction rate information.
  • the vehicle recall sound in which the sound pressure level in the audible band of the sound leaking into the vehicle interior is reduced is output outside the vehicle.
  • the specification of one reference sound source data suitable for the vehicle type and the vehicle interior environment from among the plurality of sound source data stored in the storage unit 710, and the leakage sound into the vehicle interior are all areas of the audible band.
  • the determination of the reduction rate information for causing the supply unit 750 to perform the sound pressure level reduction process for making the value less than the predetermined value is automatically performed. As a result, user convenience can be improved.
  • FIG. 2 shows a schematic configuration of a sound output device 700B according to the second embodiment.
  • the sound output device 700 ⁇ / b> B includes a server device 810 and a terminal device 910.
  • data communication using the communication network 500 is possible between the server device 810 and the terminal device 910.
  • the server device 810 is installed at a fixed position in a building, for example.
  • the server device 810 includes a storage unit 710, a level detection unit 720, a control unit 740, and a supply unit 750.
  • the terminal device 910 is mounted on the vehicle MV.
  • the terminal device 910 includes a transmission / reception unit 780.
  • the vehicle MV includes an external sound output unit 790 and a sound collection unit 795 and is connected to the transmission / reception unit 780.
  • the sound output device 700B is different from the sound output device 700A of the first embodiment described above in that it further includes a transmission / reception unit 780.
  • the sound collection result by the sound collection unit 795 is sent to the level detection unit 720 via the transmission / reception unit 780 and the communication network 500.
  • the external output sound signal generated by the supply unit 750 is sent to the external sound output unit 790 via the communication network 500 and the transmission / reception unit 780.
  • Reference sound source data identification process In the reference sound source data specifying process, first, the control unit 740 included in the server device 810 corresponds to each of the plurality of sound source data stored in the storage unit 710 in the same manner as in the first embodiment described above. A first detection signal generation control command for causing the supply unit 750 to sequentially generate the external output sound signal for each first time length is generated.
  • the supply unit 750 When the supply unit 750 receives the first detection signal generation control command, the supply unit 750 sequentially generates external output sound signals in the same manner as in the first embodiment described above. Then, the supply unit 750 sends the generated external output sound signal to the terminal device 910 via the communication network 500.
  • the transmission / reception unit 780 sequentially receives the external output sound signals sent from the supply unit 750. Then, the transmission / reception unit 780 sends the external output sound signal to the external sound output unit 790.
  • the external sound output unit 790 that has received the external output sound signal outputs the sound according to the signal toward the outside of the vehicle MV. After the sound is output from the external sound output unit 790 in this way, the sound collection unit 795 collects the leakage sound that has leaked into the vehicle interior of the vehicle MV. Then, the sound collection unit 795 sends the sound collection result to the transmission / reception unit 780.
  • the transmission / reception unit 780 When receiving the sound collection result sent from the sound collection unit 795, the transmission / reception unit 780 sends the sound collection result to the level detection unit 720 included in the server device 810 via the communication network 500.
  • the level detection unit 720 that acquired the sound collection result analyzes the sound collection result and detects the sound pressure level in the audible band of the leaked sound into the vehicle interior, as in the case of the first embodiment described above. . Then, the level detection unit 720 sequentially sends the level detection results to the control unit 740.
  • the control unit 740 that has received the level detection result corresponding to each of the plurality of sound source data, like the case of the first embodiment described above, based on the level detection result, a plurality of data stored in the storage unit 710.
  • the sound source data used when the maximum value of the sound pressure level in the audible band of the leaking sound is the lowest is specified as the reference sound source data.
  • the control unit 740 causes the supply unit 750 to generate an external output sound signal corresponding to the reference sound source data over the second time length, as in the case of the first embodiment described above. Then, a second detection signal generation control command specifying the reference sound source data is sent to the supply unit 750.
  • the supply unit 750 that has received the second detection signal generation control command sequentially reads sound data included in the reference sound source data from the storage unit 710. Then, the supply unit 750 sequentially outputs the read sound data at a predetermined cycle. As a result, an external output sound signal corresponding to the reference sound source data is generated.
  • the external output sound signal generated in this way is sent to the external sound output unit 790 via the communication network 500 and the transmission / reception unit 780.
  • the control unit 740 analyzes the level detection result sent from the level detection unit 720 and detects the frequency band where the sound pressure level is equal to or higher than a predetermined value and the sound pressure level distribution in the frequency band. Then, similarly to the case of the first embodiment described above, the control unit 740, based on the detection result, the sound pressure of the external output sound corresponding to the reference sound source data output from the external sound output unit 790 during traveling. While maintaining the level as much as possible, the reduction rate information for causing the supply unit 750 to perform sound pressure level reduction processing for causing the sound leaking into the vehicle interior to be less than the predetermined value in the entire audible band region is determined.
  • the control unit 740 specifies the reference sound source data and the determined reduction rate information specified in this way to the supply unit 750. With this designation, the waveform of the external output sound output from the external sound output unit 790 during the traveling of the vehicle MV is controlled.
  • the specified reference sound source data and the determined reduction rate information supply unit 750 are designated as in the case of the first embodiment described above.
  • the control unit 740 sends a command to start generating the vehicle recall sound signal to the supply unit 750.
  • the supply unit 750 sequentially reads sound data included in the designated reference sound source data from the storage unit 710. Then, the supply unit 750 performs a sound pressure level reduction process according to the specified reduction rate information while internally outputting the read sound data sequentially in a predetermined cycle. As a result, an external output sound signal as a vehicle recall signal is generated. Then, the supply unit 750 sends the generated external output sound signal to the terminal device 910 via the communication network 500.
  • the transmission / reception unit 780 receives an external output sound signal sent from the supply unit 750. Then, the transmission / reception unit 780 sends the external output sound signal to the external sound output unit 790. As a result, as in the case of the first embodiment, the vehicle-recollected sound in which the sound pressure level in the audible band of the leaking sound into the vehicle interior is reduced is output outside the vehicle.
  • the control unit maintains the sound pressure level of the external output sound corresponding to the reference sound source data as much as possible after specifying the reference sound source data to be used while the vehicle MV is traveling.
  • the reduction rate information for causing the supply unit to perform sound pressure level reduction processing for causing the sound leaking into the passenger compartment to be less than a predetermined value in the entire audible band is determined.
  • the control unit may specify only reference sound source data to be used while the vehicle MV is traveling. In this case, the determination process of the sound pressure level reduction rate information by the control unit can be omitted.
  • the external output sound signal can be a sweep signal.
  • the sound output device is not provided with the external sound output unit. However, if there is no existing external sound output unit available, the sound output device is not connected to the external sound output unit. It is good also as a structure provided with an output part.
  • the sound output device is not provided with the sound collection unit. However, if there is no existing sound collection unit that can be used, the sound output device does not include the sound collection unit. It is good also as a structure provided.
  • a plurality of sound source data is stored in the storage unit, but one sound source data may be stored. In this case, it is possible to omit the specific processing of the sound source data that is referred to during the traveling of the vehicle MV by the control unit.
  • the sound output device includes the storage unit. However, when there is an existing storage unit that stores sound source data, the existing storage unit is used. In this way, the sound output device may not include the storage unit.
  • the transmission / reception unit of the terminal device may store information reflecting the external output sound signal transmitted from the server device in association with the sound collection result by the sound collection unit. .
  • the vehicle-recollection sound is generated using the information reflecting the external output sound signal. Can be output outside the vehicle.
  • the server device 810 includes the storage unit 710, the level detection unit 720, the control unit 740, and the supply unit 750.
  • the storage unit 710 includes the storage unit 710, the level detection unit 720, the control unit 740, and the supply unit 750.
  • any of these components is optional. It can be mounted on the vehicle side.
  • FIG. 3 shows a schematic configuration of a sound output device 100 according to an embodiment.
  • the sound output device 100 is an aspect of the sound output device 700A (see FIG. 1) of the first embodiment described above.
  • the sound output device 100 is mounted on a vehicle CR that travels on a road using an electric motor as a drive mechanism.
  • An external sound output unit 210 as an external sound output unit 790 connected to the sound output device 100, a vehicle speed sensor 220, and a sound collection unit 230 as a sound collection unit 795 are connected to the vehicle CR.
  • the external sound output unit 210 includes a left speaker that outputs sound toward the left front and a right speaker that outputs sound toward the right front.
  • the external sound output unit 210 receives an external output sound signal AOS sent from the sound output device 100. Then, the external sound output unit 210 outputs an external output sound from the left and right speakers toward the outside of the vehicle CR according to the external output sound signal AOS.
  • the vehicle speed sensor 220 detects the rotation of the wheel or axle of the vehicle CR.
  • the vehicle speed detection result SPS by the vehicle speed sensor 220 is sent to the sound output device 100.
  • the sound collection unit 230 includes a sound collection device such as a microphone disposed at a predetermined position in the vehicle CR vehicle interior.
  • the sound collection unit 230 collects sound that has reached the microphone.
  • the sound collection result AAD by the sound collection unit 230 is sent to the sound output device 100 in the form of a voltage level.
  • the sound collection result by the sound collection unit 230 is from the external sound output unit 210. Is substantially the result of collecting the leaked sound that has leaked into the passenger compartment of the vehicle CR.
  • the sound output device 100 includes a sound source information storage unit 110 as a storage unit 710 and a travel information collection unit 120.
  • the sound output device 100 includes a level detection unit 130 as a level detection unit 720, a supply unit 150 as a supply unit 750, and a control unit 160 as a control unit 740.
  • the sound source information storage unit 110 includes a memory element, and stores sound source information SSI.
  • the sound source information storage unit 110 can be accessed by the supply unit 150. Details of the sound source information SSI will be described later.
  • the traveling information collection unit 120 receives the vehicle speed detection result SPS sent from the vehicle speed sensor 220. Then, the travel information collection unit 120 converts the vehicle speed detection result SPS into vehicle speed information SP that can be handled by the control unit 160. The vehicle speed information SP thus obtained is sent to the control unit 160.
  • the level detection unit 130 includes an A characteristic filter that approximates human auditory characteristics.
  • the level detection unit 130 acquires the sound collection result AAD in the form of a voltage level sent from the sound collection unit 230.
  • the level detection part 130 converts the sound collection result AAD of the form of a voltage level into a sound pressure level using the conversion formula calibrated previously. Subsequently, the level detector 130 performs a filtering process for detecting the sound pressure level in the audible band from the converted sound pressure level.
  • the level detection unit 130 sends the filtering result to the control unit 160 as the sound pressure level LVD.
  • the supply unit 150 includes a variable notch filter and the like.
  • the supply unit 150 sequentially reads a plurality of sound data included in the sound source data designated by the control unit 160 as sound data SDD, and sequentially reads the read sound data at a predetermined cycle ⁇ . To output automatically. Then, the supply unit 150 passes the internally output signal through the variable notch filter in accordance with the sound pressure level reduction process designation sent from the control unit 160. Subsequently, the supply unit 150 performs a volume adjustment process according to the volume designation value VLC sent from the control unit 160, and generates an external output sound signal AOS. The external output sound signal AOS thus generated is sent to the external sound output unit 210.
  • the control unit 160 includes a central processing unit (CPU). This control part 160 performs the external output sound control process toward the exterior of vehicle CR in the sound output device 100 by running a predetermined
  • CPU central processing unit
  • the sound source information SSI stored in the sound source information storage unit 110 described above will be described.
  • the sound source information SSI includes a plurality of sound source data SSD 1 , SSD 2 ,..., SSD M that are output from the external sound output unit 210 while the vehicle CR is traveling. Yes.
  • a sound signal is generated by repeating the sequential reading of the sound data # j1 to #jN and outputting in order of reading at a predetermined period ⁇ .
  • step S ⁇ b> 11 the control unit 160 specifies the first sound source data from among the plurality of sound source data stored in the sound source information storage unit 110.
  • a signal generation control command PDC for generating the external output sound signal AOS corresponding to the sound source data over the first time length is generated.
  • the control unit 160 sends the command PDC to the supply unit 150.
  • the control unit 160 generates a volume designation value VLC having a predetermined volume as a volume, and sends the generated volume designation value VLC to the supply unit 150.
  • the “first time length” is determined in advance based on experiments, simulations, experiences, and the like from the viewpoint of reliably and promptly detecting the maximum value of the sound pressure level of the audible band of the sound leaking into the passenger compartment.
  • the “certain predetermined value” is a normal volume of the external output sound while the vehicle CR is traveling, and is determined in advance based on experiments, simulations, experiences, and the like.
  • the supply unit 150 When the supply unit 150 receives the instruction PDC, the supply unit 150 sequentially reads the sound data included in the designated sound source data. Then, the supply unit 150 generates the external output sound signal AOS while sequentially outputting the read sound data internally at a predetermined cycle ⁇ . The external output sound signal AOS thus generated is sent to the external sound output unit 210.
  • the external sound output unit 210 Upon receiving the external output sound signal AOS, the external sound output unit 210 outputs a sound according to the external output sound signal AOS to the outside of the vehicle. After the sound is output from the external sound output unit 210 in this way, the sound collection unit 230 collects the leakage sound that has leaked into the vehicle CR cabin. And the level detection part 130 acquires the sound collection result by the sound collection part 230, and detects the sound pressure level of the audible band of the leak sound into a vehicle interior.
  • step S12 the control unit 160 obtains the sound pressure level in the audible band of the sound leaking into the vehicle compartment detected by the level detection unit 130. Thereafter, the process proceeds to step S13.
  • step S ⁇ b> 13 the control unit 160 determines whether sound pressure levels corresponding to all sound source data stored in the sound source information storage unit 110 have been acquired. If the result of this determination is negative (step S13: N), the process proceeds to step S14.
  • step S14 the control unit 160 specifies the next sound source data from the plurality of sound source data stored in the sound source information storage unit 110, and the external output sound signal corresponding to the sound source data over the first time length.
  • a signal generation control command PDC for generating AOS is generated.
  • control unit 160 sends the command PDC to the supply unit 150.
  • control unit 160 generates a volume designation value VLC having a predetermined volume as a volume, and sends the generated volume designation value VLC to the supply unit 150. Thereafter, the process returns to step S12. Thereafter, the processes in steps S12 to S14 are repeated until the result of the determination in step S13 becomes affirmative.
  • step S13 determines the sound pressure level of the audible band of the leaked sound among the plurality of sound source data stored in the sound source information storage unit 110 based on the acquired detection result of the sound pressure level.
  • the sound source data used when the maximum value is the lowest is specified as the reference sound source data.
  • the control part 160 designates the identified reference sound source data with respect to the supply part 150 as the sound source data used during driving
  • step S16 the control unit 160 designates reference sound source data, and generates a signal generation control command PDC for generating an external output sound signal AOS corresponding to the reference sound source data over a second time length. Then, the control unit 160 sends the command PDC to the supply unit 150. In addition, the control unit 160 generates a volume designation value VLC having a predetermined volume as a volume, and sends the generated volume designation value VLC to the supply unit 150.
  • the “second time length” is determined in advance based on experiments, simulations, experiences, and the like from the viewpoint of accurately and quickly acquiring a spectrum in the audible band of the leakage sound into the passenger compartment.
  • the supply unit 150 When the supply unit 150 receives the command PDC, the supply unit 150 generates an external output sound signal AOS corresponding to the reference sound source data, and sends the external output sound signal AOS to the external sound output unit 210. Then, after the sound is output from the external sound output unit 210, the sound collection unit 230 collects the leakage sound that has leaked into the vehicle interior of the vehicle CR. Subsequently, the level detection unit 130 acquires the sound collection result by the sound collection unit 230 and detects the sound pressure level of the audible band of the leaked sound into the vehicle interior.
  • step S17 the control unit 160 performs a fast Fourier transform process on the detection result by the level detection unit 130, and the frequency band in which the sound pressure level is a predetermined value or more, and the sound pressure level distribution in the frequency band. Is detected. Thereafter, the process proceeds to step S18.
  • step S18 the control unit 160 maintains the sound pressure level of the external output sound corresponding to the reference sound source data output from the external sound output unit 210 during traveling based on the detection result as much as possible. Decrease rate information for causing the supply unit 150 to perform sound pressure level reduction processing for causing the sound to leak to be less than the predetermined value in the entire region of the audible band is determined. Then, the control unit 160 specifies the determined reduction rate information for the supply unit 150.
  • Example output sound generation processing during travel of vehicle CR In the external output sound control process during the traveling of the vehicle CR, after the specified reference sound source data and the determined reduction rate information are designated to the supply unit 150, the control unit 160 performs the vehicle recall sound signal. A signal generation control command PDC, which is a command to start generation of. Then, the control unit 160 sends a signal generation control command PDC to the supply unit 150. In addition, the control unit 160 generates a volume designated value VLC based on the vehicle speed information SP sent from the travel information collecting unit 120 and sends the generated volume designated value VLC to the supply unit 150. Note that the volume specification value VLC is specified such that the volume of the external output sound is relatively increased as the vehicle speed is relatively higher.
  • the supply unit 150 When the supply unit 150 receives the signal generation control command PDC and the sound volume designation value VLC described above, the supply unit 150 sequentially reads the sound data included in the designated reference sound source data. Then, the supply unit 150 sequentially outputs the read sound data internally at a predetermined cycle ⁇ . Subsequently, the supply unit 150 passes the internally output signal through the variable notch filter according to the specified sound pressure level reduction rate information. Then, the supply unit 150 performs a volume adjustment process according to the volume designation value VLC sent from the control unit 160, and generates an external output sound signal AOS. The external output sound signal AOS thus generated is sent to the external sound output unit 210.
  • the external sound output unit 210 that has received the external output sound signal AOS sent from the supply unit 150 outputs a sound according to the external output sound signal AOS to the outside of the vehicle. As a result, according to the external output sound control process by the control unit 160, the vehicle recall sound is output outside the vehicle.
  • control unit 160 stores a plurality of information stored in the sound source information storage unit 110 with respect to the supply unit 150 prior to the generation of the external output sound signal during the traveling of the vehicle CR. Control for sequentially generating external output sound signals corresponding to each of the sound source data is performed.
  • the external output sound signal generated by the supply unit 150 is sent to the external sound output unit 210, and the sound according to the external output sound signal is output toward the outside of the vehicle CR.
  • the sound collection unit 230 collects the leakage sound that has leaked into the passenger compartment of the vehicle CR.
  • the level detection unit 130 acquires the sound collection result by the sound collection unit 230 and detects the sound pressure level of the audible band of the leaked sound into the vehicle interior.
  • the control unit 160 determines the maximum value of the sound pressure level in the audible band of the leaked sound among the plurality of sound source data stored in the sound source information storage unit 110. Identify the sound source data used when it was the lowest.
  • the control unit 160 designates the specified sound source data to the supply unit 150 as reference sound source data to be used while the vehicle CR is traveling.
  • control unit 160 detects a frequency band in which the sound pressure level of the external output sound corresponding to the reference sound source data is a predetermined value or more, and a sound pressure level distribution in the frequency band. Based on the detection result, the control unit 160 leaks into the vehicle interior while maintaining the sound pressure level of the external output sound corresponding to the reference sound source data output from the external sound output unit 210 during traveling as much as possible.
  • the reduction rate information for causing the supply unit 150 to perform a sound pressure level reduction process for causing the sound to be less than the predetermined value in the entire region of the audible band is determined. Subsequently, the control unit 160 specifies the supply unit 150 according to the determined reduction rate information.
  • the control unit 160 starts generation of the external output sound signal.
  • the command is sent to the supply unit 150.
  • the supply unit 150 performs a sound pressure level reduction process according to the determined reduction rate information for the designated reference sound source data.
  • the vehicle recall sound in which the sound pressure level in the audible band of the sound leaking into the vehicle interior is reduced is output outside the vehicle.
  • the identification of one reference sound source data suitable for the vehicle type and the vehicle interior environment and the sound leaking into the vehicle interior are in the audible band.
  • the determination of the reduction rate information for causing the supply unit 150 to perform the sound pressure level reduction process for making it less than the predetermined value is automatically performed. As a result, user convenience can be improved.
  • all the components of the sound output device 100 are mounted on the vehicle CR, but can communicate with the terminal device mounted on the vehicle CR as in the second embodiment described above.
  • the server device may include some of the components of the sound output device 100.
  • the control unit specifies the reference sound source data to be used while the vehicle CR is traveling, and then maintains the sound pressure level of the external output sound corresponding to the reference sound source data as much as possible.
  • the reduction rate information for causing the supply unit to perform sound pressure level reduction processing for causing the sound leaking to be less than a predetermined value in the entire range of the audible band is determined.
  • the control unit may specify only the reference sound source data to be used while the vehicle CR is traveling. In this case, the determination process of the sound pressure level reduction rate information by the control unit can be omitted.
  • the external output sound signal can be a sweep signal.
  • the background noise level may be measured in advance when performing the “reference sound source data identification process and reduction rate information determination process” in the above embodiment.
  • the reference sound source data specifying process and the reduction rate information determining process can be performed based on the detection result obtained by subtracting the background noise level measured in advance from the detection result of the level detection unit.
  • the sound output device 100 is not provided with the external sound output unit 210. However, when there is no existing external sound output unit 210 that can be used, the sound output device 100 outputs the external sound. It is good also as a structure provided with a part.
  • the sound output device 100 is not provided with the sound collection unit 230. However, when there is no existing sound collection unit 230 that can be used, the sound output device 100 includes the sound collection unit. It is good also as a structure.
  • a plurality of sound source data is stored in the storage unit, but one sound source data may be stored. In this case, it is possible to omit one sound source data identification process that is referred to during the traveling of the vehicle CR by the control unit.
  • the sound source information storage unit 110 included in the sound output device 100 stores the sound source information SSI. If there is an existing storage unit that stores the information, The sound output device 100 may be configured not to include the storage unit.
  • the supply unit sequentially reads the sound data constituting the sound source data and sequentially outputs the sound data at a predetermined period ⁇ .
  • the period ⁇ based on the vehicle speed information SP.
  • a sound having different frequency characteristics depending on the vehicle speed may be output.
  • the external sound output unit outputs the external output sound from the left and right speakers.
  • an external output sound may be output only from the left speaker according to the type of road that is running.
  • control unit 160 performs a control process for generating an external output sound by executing a program.
  • control unit 160 may be a dedicated LSI (Large Scale Integrated). circuit) or the like.
  • the program executed by the control unit 160 may be acquired in a form recorded on a portable recording medium such as a CD-ROM or DVD, or may be acquired in a form distributed via a network such as the Internet. You may be made to do.

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Abstract

A supply unit (750) sequentially generates external output sound signals corresponding to each of a plurality of sound source data stored in a storage unit (710), under the control of a control unit (740); and sound corresponding to said signals is sequentially output towards outside a vehicle. After sound has been output in this way, sound leaking towards inside the vehicle is collected by a sound-collection unit (795). A level detection unit (720) then analyzes the sequential sound collection results, and detects the sound pressure level in the audible band for the leaked sound. Then the control unit (740) causes the supply unit (750) to select, as reference sound source data, sound source data used when the maximum value for the sound pressure level in the audible band is the lowest among the sound source data, on the basis of the detection results. In addition, the control unit (740) causes the supply unit (750) to perform sound pressure reduction processing, on the basis of: a frequency band having at least a prescribed value for the sound pressure level corresponding to the reference sound source data; and the sound pressure level distribution within said frequency band. As a result, vehicle-like sound can be made more appropriate, relative to a vehicle interior and exterior.

Description

音出力装置及び出力音制御方法Sound output device and output sound control method
　本発明は、音出力装置、出力音制御方法、出力音制御プログラム、及び、当該出力音制御プログラムが記録された記録媒体に関する。 The present invention relates to a sound output device, an output sound control method, an output sound control program, and a recording medium on which the output sound control program is recorded.
　近年、電池を駆動力源とする電気自動車の普及が進んでいる。こうした自動車が走行する場合には、従来のガソリン車と比べて、車外における駆動音のレベルが飛躍的に低くなる。この結果、歩行者や自転車の運転者（以下、「歩行者等」と呼ぶ）が、後方等の視野外から接近する車両の存在に気付けない事態が起こり得る。かかる事態の発生は、交通安全上、深刻な問題である。 In recent years, electric vehicles using batteries as a driving force source have been spreading. When such a vehicle travels, the level of driving sound outside the vehicle is dramatically lower than that of a conventional gasoline vehicle. As a result, a situation may occur in which a pedestrian or a bicycle driver (hereinafter referred to as “pedestrian or the like”) does not notice the presence of a vehicle approaching from outside the field of view such as behind. The occurrence of such a situation is a serious problem for traffic safety.
　このため、車両の走行状況に対応する走行音を車外へ出力する技術が提案されている（特許文献１参照：以下、「従来例」と呼ぶ）。この従来例の技術では、車速、動力源であるモータの回転数、アクセル開度等の検出結果に基づいて、一種類の走行音信号を生成して、走行音をスピーカから車外前方等へ出力するようになっている。そして、車両が走行している地域の種類に応じて、走行音出力の実行／非実行を制御するようになっている。 For this reason, a technique for outputting a running sound corresponding to the running state of the vehicle to the outside of the vehicle has been proposed (see Patent Document 1: hereinafter referred to as “conventional example”). In this conventional technology, one type of traveling sound signal is generated based on the detection results of the vehicle speed, the rotational speed of the motor that is the power source, the accelerator opening, etc., and the traveling sound is output from the speaker to the front outside the vehicle, etc. It is supposed to be. Then, execution / non-execution of the running sound output is controlled according to the type of region in which the vehicle is running.
特開２００５－２５３２３６号公報JP 2005-253236 A
　上述した従来例の技術では、車外の歩行者等に対しては、注意喚起のために適切な車両想起音を出力する。しかしながら、従来例の技術では、車外へ出力した当該車両想起音が、車室内へ漏れてくる。こうした車両想起音は人工的な音であるため、車両想起音が車室内へ漏れ続けると、搭乗者に対して不快感を与えることがある。 The conventional technology described above outputs an appropriate vehicle recall sound for alerting pedestrians outside the vehicle. However, in the conventional technique, the vehicle-like sound output to the outside of the vehicle leaks into the vehicle interior. Since such vehicle recall sound is an artificial sound, if the vehicle recall sound continues to leak into the passenger compartment, the passenger may feel uncomfortable.
　このため、歩行者等への注意喚起のために適切な車両想起音を車外へ出力する場合において、車室内の搭乗者に対して、良好な車室内環境を提供することのできる技術が待望されている。かかる要請に応えることが、本発明が解決すべき課題の一つとして挙げられる。 For this reason, there is a need for a technology that can provide a favorable vehicle interior environment to passengers in the vehicle compartment when outputting an appropriate vehicle recall sound to the outside of the vehicle for alerting pedestrians and the like. ing. Meeting this requirement is one of the problems to be solved by the present invention.
　本発明は、上記の事情を鑑みてなされたものであり、車両の内外に対して車両想起音の適正化を図ることができる新たな音出力装置及び出力音制御方法を提供することを目的とする。 The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a new sound output device and an output sound control method capable of optimizing the vehicle recall sound with respect to the inside and outside of the vehicle. To do.
　本発明は、第１の観点からすると、車両の外部に向けて音を出力する外部音出力部に、外部出力音信号を生成して供給する供給部と；前記外部音出力部から出力された後に、前記車両の車室内に漏れてきた漏れ音の可聴帯域の音圧レベルを検出するレベル検出部と；前記レベル検出部の検出結果に基づいて、前記供給部による前記外部出力音信号の生成を制御する制御部と；を備えることを特徴とする音出力装置である。 According to a first aspect of the present invention, a supply unit that generates and supplies an external output sound signal to an external sound output unit that outputs sound toward the outside of the vehicle; and output from the external sound output unit A level detection unit that detects a sound pressure level of an audible band of leaked sound leaked into the vehicle interior of the vehicle later; and generation of the external output sound signal by the supply unit based on a detection result of the level detection unit And a control unit that controls the sound output device.
　本発明は、第２の観点からすると、外部出力音信号を生成して、車両の外部に向けて音を出力する外部音出力部へ供給する供給部と；前記供給部による前記外部出力音信号の生成を制御する制御部と；を備える音出力装置において使用される出力音制御方法であって、前記外部音出力部から出力された後に、前記車両の車室内に漏れてきた漏れ音の可聴帯域の音圧レベルを検出するレベル検出工程と；前記レベル検出工程における検出結果に基づいて、前記制御部が前記供給部による前記外部出力音信号の生成を制御する制御工程と；を備えることを特徴とする出力音制御方法である。 According to a second aspect of the present invention, a supply unit that generates an external output sound signal and supplies the external output sound signal to an external sound output unit that outputs sound toward the outside of the vehicle; and the external output sound signal by the supply unit An output sound control method used in a sound output device comprising: a control unit that controls generation of sound; and an audible leak sound leaked into a vehicle compartment of the vehicle after being output from the external sound output unit A level detection step of detecting a sound pressure level of the band; and a control step of controlling the generation of the external output sound signal by the supply unit based on a detection result in the level detection step. This is a characteristic output sound control method.
　本発明は、第３の観点からすると、本発明の出力音制御方法を演算部に実行させる、ことを特徴とする出力音制御プログラムである。 From the third aspect, the present invention is an output sound control program characterized by causing an arithmetic unit to execute the output sound control method of the present invention.
　本発明は、第４の観点からすると、本発明の出力音制御プログラムが、演算部により読み取り可能に記録されている、ことを特徴とする記録媒体である。 From the fourth aspect, the present invention is a recording medium in which the output sound control program of the present invention is recorded so as to be readable by a calculation unit.
本発明の第１実施形態に係る音出力装置の構成を説明するためのブロック図である。It is a block diagram for demonstrating the structure of the sound output device which concerns on 1st Embodiment of this invention. 本発明の第２実施形態に係る音出力装置の構成を説明するためのブロック図である。It is a block diagram for demonstrating the structure of the sound output device which concerns on 2nd Embodiment of this invention. 本発明の一実施例に係る音出力装置の構成を概略的に説明するためのブロック図である。It is a block diagram for demonstrating schematically the structure of the sound output device which concerns on one Example of this invention. 図３の音源情報の内容を説明するための図である。It is a figure for demonstrating the content of the sound source information of FIG. 図４の音源データの内容を説明するための図である。It is a figure for demonstrating the content of the sound source data of FIG. 図３の装置における参照音源データの特定処理及び低減率情報の決定処理を説明するためのフローチャートである。4 is a flowchart for explaining reference sound source data identification processing and reduction rate information determination processing in the apparatus of FIG. 3.
　以下、本発明の実施形態を、添付図面を参照して説明する。なお、以下の説明及び図面においては、同一又は同等の要素には同一の符号を付し、重複する説明を省略する。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description and drawings, the same or equivalent elements are denoted by the same reference numerals, and redundant description is omitted.
　［第１実施形態］
　まず、本発明の第１実施形態の音出力装置７００Ａについて、図１を参照して説明する。 [First Embodiment]
First, a sound output device 700A according to a first embodiment of the present invention will be described with reference to FIG.
　＜構成＞
　図１には、第１実施形態に係る音出力装置７００Ａの概略的な構成が示されている。図１に示されるように、音出力装置７００Ａは、電気自動車ＭＶ（以下、「車両ＭＶ」と呼ぶ）に搭載され、外部音出力部７９０及び収音部７９５が接続されるようになっている。 <Configuration>
FIG. 1 shows a schematic configuration of a sound output device 700A according to the first embodiment. As shown in FIG. 1, the sound output device 700A is mounted on an electric vehicle MV (hereinafter referred to as “vehicle MV”), and is connected to an external sound output unit 790 and a sound collection unit 795. .
　ここで、外部音出力部７９０は、スピーカを備えて構成される。外部音出力部７９０は、音出力装置７００Ａから送られた外部出力音信号を受ける。そして、外部音出力部７９０は、外部出力音信号に従った音を、車両ＭＶの外部へ向けて出力する。 Here, the external sound output unit 790 includes a speaker. The external sound output unit 790 receives the external output sound signal sent from the sound output device 700A. Then, the external sound output unit 790 outputs a sound according to the external output sound signal toward the outside of the vehicle MV.
　また、収音部７９５は、車両ＭＶの車室内に配置されたマイクロフォンを備えて構成される。収音部７９５は、当該マイクロフォンに到達した音を収音する。収音部７９５による収音結果は、音出力装置７００Ａへ送られる。 Further, the sound collection unit 795 is configured to include a microphone disposed in the vehicle interior of the vehicle MV. The sound collection unit 795 collects sound that has reached the microphone. The sound collection result by the sound collection unit 795 is sent to the sound output device 700A.
　なお、周囲音が無い、又は、殆ど無い静謐な音環境（以下、「静音環境」という）で、外部音出力部７９０から音が出力されている場合には、収音部７９５による収音結果は、外部音出力部７９０からの出力音が、実質的に、車両ＭＶの車室内に漏れてきた漏れ音の収音結果となる。 If a sound is output from the external sound output unit 790 in a quiet sound environment (hereinafter referred to as “silent environment”) with no or almost no ambient sound, the sound collection result by the sound collection unit 795 In other words, the sound output from the external sound output unit 790 is substantially the result of collecting the leaked sound that has leaked into the vehicle interior of the vehicle MV.
　上記の音出力装置７００Ａは、記憶部７１０と、レベル検出部７２０とを備えている。また、音出力装置７００Ａは、制御部７４０と、供給部７５０とを備えている。 The sound output device 700A includes a storage unit 710 and a level detection unit 720. The sound output device 700 </ b> A includes a control unit 740 and a supply unit 750.
　上記の記憶部７１０は、不揮発性の記憶領域を有している。この記憶部７１０には、供給部７５０がアクセスできるようになっている。記憶部７１０の当該不揮発性の記憶領域には、外部音出力部７９０から車両ＭＶの走行中に出力される車両想起音に関する複数の音源データが記憶される。そして、これらの音源データのそれぞれは、複数の音データから構成されている。当該複数の音データは、時系列データとなっており、これらの複数の音データが時間順次に並べられることにより、音波形が形成されるようになっている。なお、複数の音源データのそれぞれは、互いに異なるものとなっている。 The storage unit 710 has a nonvolatile storage area. The storage unit 710 can be accessed by the supply unit 750. In the non-volatile storage area of the storage unit 710, a plurality of sound source data related to the vehicle recall sound output from the external sound output unit 790 while the vehicle MV is traveling is stored. Each of these sound source data is composed of a plurality of sound data. The plurality of sound data is time-series data, and a sound waveform is formed by arranging the plurality of sound data in time sequence. Each of the plurality of sound source data is different from each other.
　ここで、「車両想起音」は、歩行者等に対して、車両ＭＶの存在を報知できるような音である。例えば、「車両想起音」としては、擬似的なエンジン音や、正弦波形の音等が挙げられる。なお、「車両想起音」の音圧レベルは、歩行者等に対する警告音として適切な音圧レベルとなるように、供給部７５０により調整されるようになっている。 Here, the “vehicle recall sound” is a sound that can notify a pedestrian or the like of the presence of the vehicle MV. For example, “vehicle recall sound” includes pseudo engine sound, sine waveform sound, and the like. The sound pressure level of the “vehicle recall sound” is adjusted by the supply unit 750 so as to be an appropriate sound pressure level as a warning sound for a pedestrian or the like.
　上記のレベル検出部７２０は、収音部７９５による収音結果を受ける。そして、レベル検出部７２０は、当該収音結果を解析して、車室内への漏れ音の可聴帯域の音圧レベルを検出する。レベル検出部７２０によるレベル検出結果は、制御部７４０へ送られる。 The level detection unit 720 receives the sound collection result from the sound collection unit 795. And the level detection part 720 analyzes the said sound collection result, and detects the sound pressure level of the audible band of the leak sound into a vehicle interior. The level detection result by the level detection unit 720 is sent to the control unit 740.
　上記の制御部７４０は、供給部７５０による外部出力音信号の生成を制御する。かかる制御に際して、制御部７４０は、車両ＭＶが静音環境中に存在することを前提として、車両ＭＶの走行中における外部出力音信号（すなわち、車両想起音信号）の生成の制御に先立って、供給部７５０に対して、記憶部７１０に記憶されている複数の音源データのそれぞれに対応する外部出力音信号を順次生成させる。そして、制御部７４０は、レベル検出部７２０から送られたレベル検出結果を順次、受ける。 The control unit 740 controls generation of an external output sound signal by the supply unit 750. In such control, the control unit 740 is supplied prior to the control of the generation of the external output sound signal (that is, the vehicle evoked sound signal) while the vehicle MV is traveling on the assumption that the vehicle MV exists in a silent environment. The unit 750 causes the external output sound signal corresponding to each of the plurality of sound source data stored in the storage unit 710 to be sequentially generated. And the control part 740 receives the level detection result sent from the level detection part 720 sequentially.
　引き続き、制御部７４０は、複数の音源データのそれぞれに対応するレベル検出結果に基づいて、車両ＭＶの走行中における外部音出力部７９０からの車両想起音の出力に際して供給部７５０が参照すべき一の音源データ（以下、「参照音源データ」と呼ぶ）を、記憶部７１０内の複数の音源データの中から特定する。 Subsequently, based on the level detection result corresponding to each of the plurality of sound source data, the control unit 740 should be referred to by the supply unit 750 when outputting the vehicle recall sound from the external sound output unit 790 while the vehicle MV is traveling. Sound source data (hereinafter referred to as “reference sound source data”) is specified from a plurality of sound source data in the storage unit 710.
　また、制御部７４０は、車両ＭＶが静音環境中に存在することを前提として、車両想起音信号の生成の制御に先立って、供給部７５０に対して、特定された参照音源データに対応する外部出力音信号を生成させる。そして、制御部７４０は、レベル検出部７２０から送られたレベル検出結果を受ける。 Further, on the assumption that the vehicle MV exists in a silent environment, the control unit 740 provides an external corresponding to the identified reference sound source data to the supply unit 750 prior to the control of the generation of the vehicle recall sound signal. An output sound signal is generated. The control unit 740 receives the level detection result sent from the level detection unit 720.
　引き続き、制御部７４０は、当該参照音源データに対応する外部出力音の出力中にレベル検出部７２０から送られたレベル検出結果を解析して、音圧レベルが所定値以上となる周波数帯域、及び、当該周波数帯域における音圧レベル分布を検出する。そして、制御部７４０は、当該検出結果に基づいて、外部音出力部７９０から出力される音の音圧レベルを極力維持しつつ、当該参照音源データに対応する外部出力音について、車室内への漏れ音が、可聴帯域の全領域において、当該所定値未満とさせるための音圧レベル低減処理を供給部７５０にさせるための低減率情報を決定する。 Subsequently, the control unit 740 analyzes the level detection result sent from the level detection unit 720 during the output of the external output sound corresponding to the reference sound source data, and the frequency band in which the sound pressure level is equal to or higher than a predetermined value, and The sound pressure level distribution in the frequency band is detected. Based on the detection result, the control unit 740 maintains the sound pressure level of the sound output from the external sound output unit 790 as much as possible, and outputs the external output sound corresponding to the reference sound source data to the vehicle interior. The reduction rate information for causing the supply unit 750 to perform a sound pressure level reduction process for causing the leaked sound to be less than the predetermined value in the entire audible band region is determined.
　こうして特定された参照音源データ、及び、決定された低減率情報を供給部７５０に対して指定することにより、制御部７４０は、供給部７５０による外部出力音信号の生成を制御する。なお、制御部７４０による制御処理の詳細については、後述する。 The control unit 740 controls the generation of the external output sound signal by the supply unit 750 by designating the reference sound source data thus identified and the determined reduction rate information to the supply unit 750. Details of the control processing by the control unit 740 will be described later.
　上記の供給部７５０は、制御部７４０による制御に従って、記憶部７１０に記憶された複数の音源データを参照して、外部出力音信号を生成する。また、供給部７５０は、制御部７４０による制御に従って、音圧レベル低減処理を行った外部出力音信号を生成する。こうして生成された外部出力音信号は、外部音出力部７９０へ送られる。 The supply unit 750 generates an external output sound signal with reference to a plurality of sound source data stored in the storage unit 710 according to control by the control unit 740. Further, the supply unit 750 generates an external output sound signal that has been subjected to the sound pressure level reduction process in accordance with the control by the control unit 740. The external output sound signal thus generated is sent to the external sound output unit 790.
　＜動作＞
　上記のように構成された音出力装置７００Ａの動作について、静音環境下において行われる参照音源データの特定処理及び低減率情報の決定処理に主に着目して説明する。 <Operation>
The operation of the sound output device 700A configured as described above will be described mainly focusing on the reference sound source data identification processing and reduction rate information determination processing performed in a silent environment.
　《参照音源データの特定処理》
　参照音源データの特定処理では、まず、制御部７４０が、記憶部７１０に記憶されている複数の音源データのそれぞれに対応する外部出力音信号を第１時間長ずつ、順次、供給部７５０に生成させるため、当該複数の音源データのうちの１つの音源データを指定した第１検出用信号生成制御指令を、指定する音源データを変化させつつ、順次、供給部７５０へ送る。第１検出用信号生成制御指令を受けた供給部７５０は、第１検出用信号生成制御指令で指定された音源データに含まれる音データを、記憶部７１０から順に読み取る。そして、供給部７５０は、読み取られた音データを、予め定められた周期で、順に、出力する。この結果、外部出力音信号が生成される。こうして生成された外部出力音信号は、外部音出力部７９０へ送られる。このようにして供給部７５０は、制御部７４０による制御の下で、複数の音源データのそれぞれに対応する外部出力音信号を順次、生成する。 << Reference sound source data identification process >>
In the process of specifying the reference sound source data, first, the control unit 740 sequentially generates external output sound signals corresponding to each of the plurality of sound source data stored in the storage unit 710 by the first time length in the supply unit 750. Therefore, a first detection signal generation control command designating one of the plurality of sound source data is sequentially sent to the supply unit 750 while changing the designated sound source data. The supply unit 750 that has received the first detection signal generation control command sequentially reads the sound data included in the sound source data designated by the first detection signal generation control command from the storage unit 710. Then, the supply unit 750 sequentially outputs the read sound data at a predetermined cycle. As a result, an external output sound signal is generated. The external output sound signal thus generated is sent to the external sound output unit 790. In this way, the supply unit 750 sequentially generates external output sound signals corresponding to each of the plurality of sound source data under the control of the control unit 740.
　なお、「第１時間長」は、後述する車室内への漏れ音の可聴帯域の音圧レベルの最大値を確実かつ迅速に検出する観点から、実験、シミュレーション、経験等に基づいて、予め定められる。 The “first time length” is determined in advance based on experiments, simulations, experiences, etc. from the viewpoint of reliably and promptly detecting the maximum value of the sound pressure level of the audible band of the leaking sound into the vehicle interior to be described later. It is done.
　外部出力音信号を受けた外部音出力部７９０は、外部出力音信号に従った音を車両ＭＶの外部に向けて出力する。こうして外部音出力部７９０から音が出力された後に、車両ＭＶの車室内に漏れてきた漏れ音を、収音部７９５が収音する。そして、収音部７９５は、収音結果をレベル検出部７２０へ送る。当該収音結果を取得したレベル検出部７２０は、取得結果を解析して、車室内への漏れ音の可聴帯域の音圧レベルを検出する。そして、レベル検出部７２０は、レベル検出結果を、順次、制御部７４０へ送る。 The external sound output unit 790 that has received the external output sound signal outputs a sound according to the external output sound signal toward the outside of the vehicle MV. After the sound is output from the external sound output unit 790 in this way, the sound collection unit 795 collects the leakage sound that has leaked into the vehicle interior of the vehicle MV. Then, the sound collection unit 795 sends the sound collection result to the level detection unit 720. The level detection unit 720 that has acquired the sound collection result analyzes the acquisition result and detects the sound pressure level in the audible band of the sound leaking into the vehicle interior. Then, the level detection unit 720 sequentially sends the level detection results to the control unit 740.
　レベル検出部７２０から送られた複数の音源データのそれぞれに対応するレベル検出結果を受けた制御部７４０は、記憶部７１０に記憶されている複数の音源データの中で、漏れ音の可聴帯域の音圧レベルの最大値が最も低かったときに使用した音源データを、参照音源データとして特定する。 The control unit 740 that has received the level detection result corresponding to each of the plurality of sound source data transmitted from the level detection unit 720 has the audible band of the leakage sound among the plurality of sound source data stored in the storage unit 710. The sound source data used when the maximum value of the sound pressure level is the lowest is specified as the reference sound source data.
　《低減率情報の決定処理》
　上述のようにして参照音源データが特定されると、制御部７４０は、参照音源データに対応する外部出力音信号を第２時間長にわたって、供給部７５０に生成させるため、参照音源データを指定した第２検出用信号生成制御指令を供給部７５０へ送る。第２検出用信号生成制御指令を受けた供給部７５０は、参照音源データに含まれる音データを、記憶部７１０から順に読み取る。そして、供給部７５０は、読み取られた音データを、予め定められた周期で、順に、出力する。この結果、参照音源データに対応する外部出力音信号が生成される。こうして生成された外部出力音信号は、外部音出力部７９０へ送られる。このようにして供給部７５０は、制御部７４０による制御の下で、参照音源データに対応する外部出力音信号を生成する。 << Reduction rate information determination process >>
When the reference sound source data is specified as described above, the control unit 740 designates the reference sound source data in order to cause the supply unit 750 to generate the external output sound signal corresponding to the reference sound source data over the second time length. A second detection signal generation control command is sent to the supply unit 750. The supply unit 750 that has received the second detection signal generation control command sequentially reads sound data included in the reference sound source data from the storage unit 710. Then, the supply unit 750 sequentially outputs the read sound data at a predetermined cycle. As a result, an external output sound signal corresponding to the reference sound source data is generated. The external output sound signal thus generated is sent to the external sound output unit 790. In this way, the supply unit 750 generates an external output sound signal corresponding to the reference sound source data under the control of the control unit 740.
　なお、「第２時間長」は、後述する車室内への漏れ音の可聴帯域におけるスペクトルを精度良くかつ迅速に取得するとの観点から、実験、シミュレーション、経験等に基づいて、予め定められる。 The “second time length” is determined in advance based on experiments, simulations, experiences, and the like from the viewpoint of accurately and quickly acquiring a spectrum in the audible band of leaking sound into the vehicle interior, which will be described later.
　次いで、制御部７４０は、レベル検出部７２０から送られたレベル検出結果を解析して、音圧レベルが所定値以上となる周波数帯域、及び、当該周波数帯域における音圧レベル分布を検出する。そして、制御部７４０は、当該検出結果に基づいて、走行中に外部音出力部７９０から出力される参照音源データに対応する外部出力音の音圧レベルを極力維持しつつ、車室内への漏れ音が、可聴帯域の全領域において、当該所定値未満とさせるための音圧レベル低減処理を供給部７５０にさせるための低減率情報を決定する。 Next, the control unit 740 analyzes the level detection result sent from the level detection unit 720 and detects the frequency band where the sound pressure level is equal to or higher than a predetermined value and the sound pressure level distribution in the frequency band. Based on the detection result, the control unit 740 leaks into the vehicle interior while maintaining the sound pressure level of the external output sound corresponding to the reference sound source data output from the external sound output unit 790 during traveling as much as possible. Decrease rate information for causing the supply unit 750 to perform a sound pressure level reduction process for causing the sound to be less than the predetermined value in the entire region of the audible band is determined.
　こうして特定された参照音源データ、及び、決定された低減率情報を、制御部７４０は、供給部７５０に対して指定する。かかる指定により、車両ＭＶの走行中において外部音出力部７９０から出力される外部出力音（すなわち、車両想起音）の波形が制御されることになる。 The control unit 740 specifies the reference sound source data and the determined reduction rate information specified in this way to the supply unit 750. With this designation, the waveform of the external output sound (that is, the vehicle recall sound) output from the external sound output unit 790 while the vehicle MV is traveling is controlled.
　《車両ＭＶの走行中における外部出力音発生処理》
　車両ＭＶの走行中における外部出力音発生処理に際しては、上述のようにして特定された参照音源データ、及び、決定された低減率情報の供給部７５０に対する指定が行われた後、制御部７４０が、車両想起音信号の生成開始の指令を供給部７５０へ送る。かかる車両想起音信号の生成開始の指令を受けると、供給部７５０は、指定されている参照音源データに含まれる音データを、記憶部７１０から順に読み取る。そして、供給部７５０は、読み取られた音データを、予め定められた周期で、順に、内部的に出力しつつ、指定されている低減率情報に従った音圧レベル低減処理を行う。この結果、車両想起音信号としての外部出力音信号が生成される。こうして生成された外部出力音信号は、外部音出力部７９０へ送られる。 << External output sound generation processing during running of vehicle MV >>
In the process of generating the external output sound while the vehicle MV is traveling, the control unit 740 performs the designation for the reference sound source data identified as described above and the supply unit 750 for the determined reduction rate information. Then, a command to start generation of the vehicle recall sound signal is sent to the supply unit 750. When receiving a command to start generation of the vehicle recall sound signal, the supply unit 750 sequentially reads sound data included in the designated reference sound source data from the storage unit 710. Then, the supply unit 750 performs a sound pressure level reduction process according to the specified reduction rate information while internally outputting the read sound data sequentially in a predetermined cycle. As a result, an external output sound signal as a vehicle recall signal is generated. The external output sound signal thus generated is sent to the external sound output unit 790.
　外部出力音信号を受けた外部音出力部７９０は、当該信号に従った車両想起音を車両ＭＶの外部に向けて出力する。この結果、車室内への漏れ音の可聴帯域のおける音圧レベルが低減された車両想起音が、車外へ出力される。 Upon receiving the external output sound signal, the external sound output unit 790 outputs the vehicle recall sound according to the signal toward the outside of the vehicle MV. As a result, the vehicle recall sound in which the sound pressure level in the audible band of the sound leaked into the vehicle interior is reduced is output outside the vehicle.
　以上説明したように、本第１実施形態では、制御部７４０が、車両ＭＶの走行中における外部出力音信号の生成に先立って、供給部７５０に対して、記憶部７１０に記憶されている複数の音源データのそれぞれに対応する外部出力音信号を順次生成させる制御を行う。供給部７５０により生成された外部出力音信号は、外部音出力部７９０へ送られ、当該信号に従った音が、車両ＭＶの外部に向けて出力される。 As described above, in the first embodiment, the control unit 740 stores a plurality of data stored in the storage unit 710 with respect to the supply unit 750 prior to the generation of the external output sound signal while the vehicle MV is traveling. Control is performed to sequentially generate external output sound signals corresponding to each of the sound source data. The external output sound signal generated by the supply unit 750 is sent to the external sound output unit 790, and the sound according to the signal is output toward the outside of the vehicle MV.
　こうして外部音出力部７９０から音が出力された後に、車両ＭＶの車室内に漏れてきた漏れ音を、収音部７９５が収音する。収音部７９５による収音結果は、レベル検出部７２０へ送られ、レベル検出部７２０が、車室内への漏れ音の可聴帯域の音圧レベルを検出する。そして、制御部７４０が、レベル検出部７２０によるレベル検出結果に基づいて、記憶部７１０に記憶されている複数の音源データの中で、漏れ音の可聴帯域の音圧レベルの最大値が最も低かったときに使用した音源データを特定する。引き続き、制御部７４０は、当該特定された音源データを、車両ＭＶの走行中において使用する参照音源データとして、供給部７５０に対して指定する。 Thus, after the sound is output from the external sound output unit 790, the sound collection unit 795 collects the leakage sound that has leaked into the vehicle interior of the vehicle MV. The sound collection result by the sound collection unit 795 is sent to the level detection unit 720, and the level detection unit 720 detects the sound pressure level in the audible band of the leakage sound into the vehicle compartment. Then, based on the level detection result by the level detection unit 720, the control unit 740 has the lowest sound pressure level in the audible band of the leaking sound among the plurality of sound source data stored in the storage unit 710. Identify the sound source data used when Subsequently, the control unit 740 designates the specified sound source data to the supply unit 750 as reference sound source data to be used while the vehicle MV is traveling.
　また、制御部７４０は、参照音源データに対応する外部出力音の音圧レベルが所定値以上となる周波数帯域、及び、当該周波数帯域における音圧レベル分布を検出する。そして、制御部７４０が、当該検出結果に基づいて、走行中に外部音出力部７９０から出力される参照音源データに対応する外部出力音の音圧レベルを極力維持しつつ、車室内への漏れ音が、可聴帯域の全領域において、当該所定値未満とさせるための音圧レベル低減処理を供給部７５０にさせるための低減率情報を決定する。引き続き、制御部７４０は、決定された低減率情報を、供給部７５０に対して指定する。 Further, the control unit 740 detects a frequency band in which the sound pressure level of the external output sound corresponding to the reference sound source data is a predetermined value or more, and a sound pressure level distribution in the frequency band. Based on the detection result, the control unit 740 leaks into the vehicle interior while maintaining the sound pressure level of the external output sound corresponding to the reference sound source data output from the external sound output unit 790 during traveling as much as possible. Decrease rate information for causing the supply unit 750 to perform a sound pressure level reduction process for causing the sound to be less than the predetermined value in the entire region of the audible band is determined. Subsequently, the control unit 740 designates the determined reduction rate information to the supply unit 750.
　そして、車両ＭＶの走行中においては、特定された参照音源データ、及び、決定された低減率情報の供給部７５０に対する指定が行われた後、制御部７４０が、車両想起音信号の生成開始の指令を供給部７５０へ送る。かかる車両想起音信号の生成開始の指令を受けると、供給部７５０は、指定された参照音源データに対し、決定された低減率情報に従った音圧レベルの低減処理を行う。この結果、車室内への漏れ音の可聴帯域における音圧レベルが低減された車両想起音が、車外へ出力される。 Then, while the vehicle MV is traveling, after the specified reference sound source data and the determined reduction rate information are specified for the supply unit 750, the control unit 740 starts generation of the vehicle recall signal. The command is sent to the supply unit 750. When receiving a command to start generation of such a vehicle-like sound signal, the supply unit 750 performs a sound pressure level reduction process on the designated reference sound source data according to the determined reduction rate information. As a result, the vehicle recall sound in which the sound pressure level in the audible band of the sound leaking into the vehicle interior is reduced is output outside the vehicle.
　このため、記憶部７１０に記憶されている複数の音源データの中から、車種や車室内環境に適した一の参照音源データの特定、並びに、車室内への漏れ音が、可聴帯域の全領域において、所定値未満とさせるための音圧レベル低減処理を供給部７５０にさせるための低減率情報の決定が自動で行われる。この結果、利用者の利便性を向上させることができる。 For this reason, the specification of one reference sound source data suitable for the vehicle type and the vehicle interior environment from among the plurality of sound source data stored in the storage unit 710, and the leakage sound into the vehicle interior are all areas of the audible band. , The determination of the reduction rate information for causing the supply unit 750 to perform the sound pressure level reduction process for making the value less than the predetermined value is automatically performed. As a result, user convenience can be improved.
　したがって、本発明の第１実施形態によれば、車両の内外に対して車両想起音の適正化を図ることができる。 Therefore, according to the first embodiment of the present invention, it is possible to optimize the vehicle recall sound for the inside and outside of the vehicle.
　［第２実施形態］
　次に、本発明の第２実施形態の音出力装置７００Ｂについて、図２を参照して説明する。 [Second Embodiment]
Next, a sound output device 700B according to a second embodiment of the present invention will be described with reference to FIG.
　＜構成＞
　図２には、第２実施形態に係る音出力装置７００Ｂの概略的な構成が示されている。図２に示されるように、音出力装置７００Ｂは、サーバ装置８１０と、端末装置９１０とを備えている。ここで、サーバ装置８１０と端末装置９１０との間では、通信ネットワーク５００を利用したデータ通信が可能となっている。 <Configuration>
FIG. 2 shows a schematic configuration of a sound output device 700B according to the second embodiment. As shown in FIG. 2, the sound output device 700 </ b> B includes a server device 810 and a terminal device 910. Here, data communication using the communication network 500 is possible between the server device 810 and the terminal device 910.
　上記のサーバ装置８１０は、例えば、建屋内の固定的な位置に設置される。サーバ装置８１０は、記憶部７１０と、レベル検出部７２０と、制御部７４０と、供給部７５０とを備えている。 The server device 810 is installed at a fixed position in a building, for example. The server device 810 includes a storage unit 710, a level detection unit 720, a control unit 740, and a supply unit 750.
　上記の端末装置９１０は、車両ＭＶに搭載される。端末装置９１０は、送受信部７８０を備えている。また、車両ＭＶには、外部音出力部７９０と、収音部７９５とが搭載され、送受信部７８０に接続されている。 The terminal device 910 is mounted on the vehicle MV. The terminal device 910 includes a transmission / reception unit 780. In addition, the vehicle MV includes an external sound output unit 790 and a sound collection unit 795 and is connected to the transmission / reception unit 780.
　すなわち、音出力装置７００Ｂは、上述した第１実施形態の音出力装置７００Ａと比べて、送受信部７８０を更に備える点が異なっている。そして、収音部７９５による収音結果は、送受信部７８０及び通信ネットワーク５００を介して、レベル検出部７２０へ送られるようになっている。また、供給部７５０により生成された外部出力音信号は、通信ネットワーク５００及び送受信部７８０を介して、外部音出力部７９０へ送られるようになっている。 That is, the sound output device 700B is different from the sound output device 700A of the first embodiment described above in that it further includes a transmission / reception unit 780. The sound collection result by the sound collection unit 795 is sent to the level detection unit 720 via the transmission / reception unit 780 and the communication network 500. Also, the external output sound signal generated by the supply unit 750 is sent to the external sound output unit 790 via the communication network 500 and the transmission / reception unit 780.
　＜動作＞
　上記のように構成された音出力装置７００Ｂの動作について、説明する。なお、サーバ装置８１０は、常時、動作しているものとする。 <Operation>
The operation of the sound output device 700B configured as described above will be described. Note that the server device 810 is always operating.
　《参照音源データの特定処理》
　参照音源データの特定処理では、まず、サーバ装置８１０が備える制御部７４０が、上述した第１実施形態の場合と同様にして、記憶部７１０に記憶されている複数の音源データのそれぞれに対応する外部出力音信号を第１時間長ずつ、順次、供給部７５０に生成させるための第１検出用信号生成制御指令を生成する。 << Reference sound source data identification process >>
In the reference sound source data specifying process, first, the control unit 740 included in the server device 810 corresponds to each of the plurality of sound source data stored in the storage unit 710 in the same manner as in the first embodiment described above. A first detection signal generation control command for causing the supply unit 750 to sequentially generate the external output sound signal for each first time length is generated.
　供給部７５０は、第１検出用信号生成制御指令を受けると、上述した第１実施形態の場合と同様にして、外部出力音信号を順次、生成する。そして、供給部７５０は、通信ネットワーク５００を介して、生成された外部出力音信号を端末装置９１０へ送る。 When the supply unit 750 receives the first detection signal generation control command, the supply unit 750 sequentially generates external output sound signals in the same manner as in the first embodiment described above. Then, the supply unit 750 sends the generated external output sound signal to the terminal device 910 via the communication network 500.
　端末装置９１０では、送受信部７８０が、供給部７５０から送られた外部出力音信号を順次、受ける。そして、送受信部７８０は、当該外部出力音信号を外部音出力部７９０へ送る。外部出力音信号を受けた外部音出力部７９０は、当該信号に従った音を車両ＭＶの外部に向けて出力する。こうして外部音出力部７９０から音が出力された後に、車両ＭＶの車室内に漏れてきた漏れ音を、収音部７９５が収音する。そして、収音部７９５は、収音結果を送受信部７８０へ送る。送受信部７８０は、収音部７９５から送られた収音結果を受けると、通信ネットワーク５００を介して、当該収音結果を、サーバ装置８１０が備えるレベル検出部７２０へ送る。当該収音結果を取得したレベル検出部７２０は、上述した第１実施形態の場合と同様に、当該収音結果を解析して、車室内への漏れ音の可聴帯域の音圧レベルを検出する。そして、レベル検出部７２０は、レベル検出結果を、順次、制御部７４０へ送る。 In the terminal device 910, the transmission / reception unit 780 sequentially receives the external output sound signals sent from the supply unit 750. Then, the transmission / reception unit 780 sends the external output sound signal to the external sound output unit 790. The external sound output unit 790 that has received the external output sound signal outputs the sound according to the signal toward the outside of the vehicle MV. After the sound is output from the external sound output unit 790 in this way, the sound collection unit 795 collects the leakage sound that has leaked into the vehicle interior of the vehicle MV. Then, the sound collection unit 795 sends the sound collection result to the transmission / reception unit 780. When receiving the sound collection result sent from the sound collection unit 795, the transmission / reception unit 780 sends the sound collection result to the level detection unit 720 included in the server device 810 via the communication network 500. The level detection unit 720 that acquired the sound collection result analyzes the sound collection result and detects the sound pressure level in the audible band of the leaked sound into the vehicle interior, as in the case of the first embodiment described above. . Then, the level detection unit 720 sequentially sends the level detection results to the control unit 740.
　複数の音源データのそれぞれに対応するレベル検出結果を受けた制御部７４０は、上述した第１実施形態の場合と同様に、当該レベル検出結果に基づいて、記憶部７１０に記憶されている複数の音源データの中で、漏れ音の可聴帯域の音圧レベルの最大値が最も低かったときに使用した音源データを、参照音源データとして特定する。
　《低減率情報の決定処理》 The control unit 740 that has received the level detection result corresponding to each of the plurality of sound source data, like the case of the first embodiment described above, based on the level detection result, a plurality of data stored in the storage unit 710. In the sound source data, the sound source data used when the maximum value of the sound pressure level in the audible band of the leaking sound is the lowest is specified as the reference sound source data.
<< Reduction rate information determination process >>
　参照音源データが特定されると、制御部７４０は、上述した第１実施形態の場合と同様に、参照音源データに対応する外部出力音信号を第２時間長にわたって、供給部７５０に生成させるため、参照音源データを指定した第２検出用信号生成制御指令を供給部７５０へ送る。第２検出用信号生成制御指令を受けた供給部７５０は、参照音源データに含まれる音データを、記憶部７１０から順に読み取る。そして、供給部７５０は、読み取られた音データを、予め定められた周期で、順に、出力する。この結果、参照音源データに対応する外部出力音信号が生成される。こうして生成された外部出力音信号は、通信ネットワーク５００及び送受信部７８０を介して、外部音出力部７９０へ送られる。 When the reference sound source data is specified, the control unit 740 causes the supply unit 750 to generate an external output sound signal corresponding to the reference sound source data over the second time length, as in the case of the first embodiment described above. Then, a second detection signal generation control command specifying the reference sound source data is sent to the supply unit 750. The supply unit 750 that has received the second detection signal generation control command sequentially reads sound data included in the reference sound source data from the storage unit 710. Then, the supply unit 750 sequentially outputs the read sound data at a predetermined cycle. As a result, an external output sound signal corresponding to the reference sound source data is generated. The external output sound signal generated in this way is sent to the external sound output unit 790 via the communication network 500 and the transmission / reception unit 780.
　次いで、制御部７４０は、レベル検出部７２０から送られたレベル検出結果を解析して、音圧レベルが所定値以上となる周波数帯域、及び、当該周波数帯域における音圧レベル分布を検出する。そして、制御部７４０は、上述した第１実施形態の場合と同様に、当該検出結果に基づいて、走行中に外部音出力部７９０から出力される参照音源データに対応する外部出力音の音圧レベルを極力維持しつつ、車室内への漏れ音が、可聴帯域の全領域において、当該所定値未満とさせるための音圧レベル低減処理を供給部７５０にさせるための低減率情報を決定する。 Next, the control unit 740 analyzes the level detection result sent from the level detection unit 720 and detects the frequency band where the sound pressure level is equal to or higher than a predetermined value and the sound pressure level distribution in the frequency band. Then, similarly to the case of the first embodiment described above, the control unit 740, based on the detection result, the sound pressure of the external output sound corresponding to the reference sound source data output from the external sound output unit 790 during traveling. While maintaining the level as much as possible, the reduction rate information for causing the supply unit 750 to perform sound pressure level reduction processing for causing the sound leaking into the vehicle interior to be less than the predetermined value in the entire audible band region is determined.
　こうして特定された参照音源データ、及び、決定された低減率情報を、制御部７４０は、供給部７５０に対して指定する。かかる指定により、車両ＭＶの走行中において外部音出力部７９０から出力される外部出力音の波形が制御されることになる。 The control unit 740 specifies the reference sound source data and the determined reduction rate information specified in this way to the supply unit 750. With this designation, the waveform of the external output sound output from the external sound output unit 790 during the traveling of the vehicle MV is controlled.
　《車両ＭＶの走行中における外部出力音発生処理》
　車両ＭＶの走行中における外部出力音発生処理に際しては、上述した第１実施形態の場合と同様に、特定された参照音源データ、及び、決定された低減率情報の供給部７５０に対する指定が行われた後、制御部７４０が、車両想起音信号の生成開始の指令を供給部７５０へ送る。かかる車両想起音信号の生成開始の指令を受けると、供給部７５０は、指定されている参照音源データに含まれる音データを、記憶部７１０から順に読み取る。そして、供給部７５０は、読み取られた音データを、予め定められた周期で、順に、内部的に出力しつつ、指定されている低減率情報に従った音圧レベル低減処理を行う。この結果、車両想起音信号としての外部出力音信号が生成される。そして、供給部７５０は、通信ネットワーク５００を介して、生成された外部出力音信号を端末装置９１０へ送る。 << External output sound generation processing during running of vehicle MV >>
In the external output sound generation processing while the vehicle MV is traveling, the specified reference sound source data and the determined reduction rate information supply unit 750 are designated as in the case of the first embodiment described above. After that, the control unit 740 sends a command to start generating the vehicle recall sound signal to the supply unit 750. When receiving a command to start generation of the vehicle recall sound signal, the supply unit 750 sequentially reads sound data included in the designated reference sound source data from the storage unit 710. Then, the supply unit 750 performs a sound pressure level reduction process according to the specified reduction rate information while internally outputting the read sound data sequentially in a predetermined cycle. As a result, an external output sound signal as a vehicle recall signal is generated. Then, the supply unit 750 sends the generated external output sound signal to the terminal device 910 via the communication network 500.
　端末装置９１０では、送受信部７８０が、供給部７５０から送られた外部出力音信号を受ける。そして、送受信部７８０は、当該外部出力音信号を外部音出力部７９０へ送る。この結果、第１実施形態の場合と同様に、車室内への漏れ音の可聴帯域における音圧レベルが低減された車両想起音が、車外へ出力される。 In the terminal device 910, the transmission / reception unit 780 receives an external output sound signal sent from the supply unit 750. Then, the transmission / reception unit 780 sends the external output sound signal to the external sound output unit 790. As a result, as in the case of the first embodiment, the vehicle-recollected sound in which the sound pressure level in the audible band of the leaking sound into the vehicle interior is reduced is output outside the vehicle.
　したがって、本発明の第２実施形態によれば、上述した第１実施形態の場合と同様に、車両の内外に対して車両想起音の適正化を図ることができる。 Therefore, according to the second embodiment of the present invention, as in the case of the first embodiment described above, it is possible to optimize the vehicle recall sound for the inside and outside of the vehicle.
　［実施形態の変形］
　なお、上記の第１及び第２実施形態では、制御部は、車両ＭＶの走行中において使用する参照音源データの特定した後に、参照音源データに対応する外部出力音の音圧レベルを極力維持しつつ、車室内への漏れ音が、可聴帯域の全領域において、所定値未満とさせるための音圧レベル低減処理を供給部にさせるための低減率情報を決定した。これに対して、制御部は、車両ＭＶの走行中において使用する参照音源データの特定のみを行うようにしてもよい。この場合には、制御部による音圧レベルの低減率情報の決定処理を省略することができる。また、この場合には、外部出力音信号をスイープ信号とすることができる。 [Modification of Embodiment]
In the first and second embodiments described above, the control unit maintains the sound pressure level of the external output sound corresponding to the reference sound source data as much as possible after specifying the reference sound source data to be used while the vehicle MV is traveling. On the other hand, the reduction rate information for causing the supply unit to perform sound pressure level reduction processing for causing the sound leaking into the passenger compartment to be less than a predetermined value in the entire audible band is determined. On the other hand, the control unit may specify only reference sound source data to be used while the vehicle MV is traveling. In this case, the determination process of the sound pressure level reduction rate information by the control unit can be omitted. In this case, the external output sound signal can be a sweep signal.
　また、上記の第１及び第２実施形態では、音出力装置は外部音出力部を備えないようにしたが、利用可能な既存の外部音出力部が無い場合には、音出力装置が外部音出力部を備える構成としてもよい。 In the first and second embodiments described above, the sound output device is not provided with the external sound output unit. However, if there is no existing external sound output unit available, the sound output device is not connected to the external sound output unit. It is good also as a structure provided with an output part.
　また、上記の第１及び第２実施形態では、音出力装置は収音部を備えないようにしたが、利用可能な既存の収音部が無い場合には、音出力装置が収音部を備える構成としてもよい。 In the first and second embodiments described above, the sound output device is not provided with the sound collection unit. However, if there is no existing sound collection unit that can be used, the sound output device does not include the sound collection unit. It is good also as a structure provided.
　また、上記の第１及び第２実施形態では、記憶部には、複数の音源データが記憶されるとしたが、１つの音源データを記憶させるようにしてもよい。この場合には、制御部による車両ＭＶの走行中において参照する一の音源データの特定処理を省略することができる。 In the first and second embodiments described above, a plurality of sound source data is stored in the storage unit, but one sound source data may be stored. In this case, it is possible to omit the specific processing of the sound source data that is referred to during the traveling of the vehicle MV by the control unit.
　また、上記の第１及び第２実施形態では、音出力装置は記憶部を備えるようにしたが、音源データを記憶した既存の記憶部が存在する場合には、当該既存の記憶部を利用するようにし、音出力装置が記憶部を備えない構成としてもよい。 In the first and second embodiments, the sound output device includes the storage unit. However, when there is an existing storage unit that stores sound source data, the existing storage unit is used. In this way, the sound output device may not include the storage unit.
　また、上記の第２実施形態において、端末装置の送受信部が、収音部による収音結果に対応付けて、サーバ装置から送られる外部出力音信号を反映した情報を記憶するようにしてもよい。この場合には、サーバ装置と端末装置との間で、通信ネットワークを利用したデータ通信ができなくなった場合であっても、当該外部出力音信号を反映した情報を利用して、車両想起音を車外へ出力することができる。 In the second embodiment, the transmission / reception unit of the terminal device may store information reflecting the external output sound signal transmitted from the server device in association with the sound collection result by the sound collection unit. . In this case, even if the data communication using the communication network cannot be performed between the server device and the terminal device, the vehicle-recollection sound is generated using the information reflecting the external output sound signal. Can be output outside the vehicle.
　また、第２実施形態では、サーバ装置８１０が、記憶部７１０と、レベル検出部７２０と、制御部７４０と、供給部７５０とを備えるようにしたが、これらの構成要素のいずれについても、任意に車両側に搭載するようにできる。 In the second embodiment, the server device 810 includes the storage unit 710, the level detection unit 720, the control unit 740, and the supply unit 750. However, any of these components is optional. It can be mounted on the vehicle side.
　以下、本発明の音出力装置の一実施例を、図３～図６を参照して説明する。なお、以下の説明及び図面においては、同一又は同等の要素については同一の符号を付し、重複する説明を省略する。 Hereinafter, an embodiment of the sound output device of the present invention will be described with reference to FIGS. In the following description and drawings, the same or equivalent elements are denoted by the same reference numerals, and redundant description is omitted.
　［構成］
　図３には、一実施例に係る音出力装置１００の概略的な構成が示されている。なお、音出力装置１００は、上述した第１実施形態の音出力装置７００Ａ（図１参照）の一態様となっている。 [Constitution]
FIG. 3 shows a schematic configuration of a sound output device 100 according to an embodiment. The sound output device 100 is an aspect of the sound output device 700A (see FIG. 1) of the first embodiment described above.
　音出力装置１００は、電気モータを駆動機構とし、道路上を走行する車両ＣＲに搭載される。この車両ＣＲには、音出力装置１００に接続される外部音出力部７９０としての外部音出力部２１０、車速センサ２２０、及び、収音部７９５としての収音部２３０が接続されている。 The sound output device 100 is mounted on a vehicle CR that travels on a road using an electric motor as a drive mechanism. An external sound output unit 210 as an external sound output unit 790 connected to the sound output device 100, a vehicle speed sensor 220, and a sound collection unit 230 as a sound collection unit 795 are connected to the vehicle CR.
　ここで、上記の外部音出力部２１０は、左側前方へ向けて音を出力する左スピーカと、右側前方へ向けて音を出力する右スピーカとを備えて構成されている。この外部音出力部２１０は、音出力装置１００から送られた外部出力音信号ＡＯＳを受ける。そして、外部音出力部２１０は、当該外部出力音信号ＡＯＳに従って、左右のスピーカから車両ＣＲの外部に向けて外部出力音を出力する。 Here, the external sound output unit 210 includes a left speaker that outputs sound toward the left front and a right speaker that outputs sound toward the right front. The external sound output unit 210 receives an external output sound signal AOS sent from the sound output device 100. Then, the external sound output unit 210 outputs an external output sound from the left and right speakers toward the outside of the vehicle CR according to the external output sound signal AOS.
　また、上記の車速センサ２２０は、車両ＣＲの車輪又は車軸の回転を検出する。車速センサ２２０による車速検出結果ＳＰＳは、音出力装置１００へ送られる。 Further, the vehicle speed sensor 220 detects the rotation of the wheel or axle of the vehicle CR. The vehicle speed detection result SPS by the vehicle speed sensor 220 is sent to the sound output device 100.
　また、上記の収音部２３０は、車両ＣＲの車室内の所定位置に配置させたマイクロフォン等の収音デバイスを備えて構成されている。この収音部２３０は、当該マイクロフォンに到達した音を収音する。収音部２３０による収音結果ＡＡＤは電圧レベルの形態で、音出力装置１００へ送られる。 The sound collection unit 230 includes a sound collection device such as a microphone disposed at a predetermined position in the vehicle CR vehicle interior. The sound collection unit 230 collects sound that has reached the microphone. The sound collection result AAD by the sound collection unit 230 is sent to the sound output device 100 in the form of a voltage level.
　なお、周囲音が無い、又は、殆ど無い静謐な静音環境下で、外部音出力部２１０から音が出力されている場合には、収音部２３０による収音結果は、外部音出力部２１０からの出力音が、実質的に、車両ＣＲの車室内に漏れてきた漏れ音の収音結果となる。 Note that when sound is output from the external sound output unit 210 in a quiet and quiet environment with no ambient sound or almost no sound, the sound collection result by the sound collection unit 230 is from the external sound output unit 210. Is substantially the result of collecting the leaked sound that has leaked into the passenger compartment of the vehicle CR.
　次に、音出力装置１００の構成について、説明する。音出力装置１００は、図３に示されるように、記憶部７１０としての音源情報記憶部１１０と、走行情報収集部１２０とを備えている。また、音出力装置１００は、レベル検出部７２０としてのレベル検出部１３０と、供給部７５０としての供給部１５０と、制御部７４０としての制御部１６０とを備えている。 Next, the configuration of the sound output device 100 will be described. As shown in FIG. 3, the sound output device 100 includes a sound source information storage unit 110 as a storage unit 710 and a travel information collection unit 120. In addition, the sound output device 100 includes a level detection unit 130 as a level detection unit 720, a supply unit 150 as a supply unit 750, and a control unit 160 as a control unit 740.
　上記の音源情報記憶部１１０は、メモリ素子を備えて構成され、音源情報ＳＳＩが記憶される。この音源情報記憶部１１０には、供給部１５０がアクセスできるようになっている。なお、音源情報ＳＳＩの詳細については、後述する。 The sound source information storage unit 110 includes a memory element, and stores sound source information SSI. The sound source information storage unit 110 can be accessed by the supply unit 150. Details of the sound source information SSI will be described later.
　上記の走行情報収集部１２０は、車速センサ２２０から送られた車速検出結果ＳＰＳを受ける。そして、走行情報収集部１２０は、車速検出結果ＳＰＳを、制御部１６０で取扱可能な形態の車速情報ＳＰに変換する。こうして得られた車速情報ＳＰは、制御部１６０へ送られる。 The traveling information collection unit 120 receives the vehicle speed detection result SPS sent from the vehicle speed sensor 220. Then, the travel information collection unit 120 converts the vehicle speed detection result SPS into vehicle speed information SP that can be handled by the control unit 160. The vehicle speed information SP thus obtained is sent to the control unit 160.
　上記のレベル検出部１３０は、人間の聴覚特性を近似するＡ特性フィルタを備えて構成される。レベル検出部１３０は、収音部２３０から送られた電圧レベルの形態の収音結果ＡＡＤを取得する。そして、レベル検出部１３０は、予め較正された変換式を利用して、電圧レベルの形態の収音結果ＡＡＤを音圧レベルに変換する。引き続き、レベル検出部１３０は、変換された音圧レベルから可聴帯域の音圧レベルを検出するためのフィルタリング処理を行う。レベル検出部１３０は、フィルタリング結果を音圧レベルＬＶＤとして、制御部１６０へ送る。 The level detection unit 130 includes an A characteristic filter that approximates human auditory characteristics. The level detection unit 130 acquires the sound collection result AAD in the form of a voltage level sent from the sound collection unit 230. And the level detection part 130 converts the sound collection result AAD of the form of a voltage level into a sound pressure level using the conversion formula calibrated previously. Subsequently, the level detector 130 performs a filtering process for detecting the sound pressure level in the audible band from the converted sound pressure level. The level detection unit 130 sends the filtering result to the control unit 160 as the sound pressure level LVD.
　上記の供給部１５０は、可変ノッチフィルタ等を備えて構成されている。この供給部１５０は、制御部１６０により指定された音源データに含まれる複数の音データを、順次、音データＳＤＤとして読み取った後、所定の周期τで、読み取られた音データを、順次、内部的に出力する。そして、供給部１５０は、制御部１６０から送られた音圧レベル低減処理指定に従って、内部的に出力した信号を可変ノッチフィルタに通過させる。引き続き、供給部１５０は、制御部１６０から送られた音量指定値ＶＬＣに従った音量調整処理を施して、外部出力音信号ＡＯＳを生成する。こうして生成された外部出力音信号ＡＯＳは、外部音出力部２１０へ送られる The supply unit 150 includes a variable notch filter and the like. The supply unit 150 sequentially reads a plurality of sound data included in the sound source data designated by the control unit 160 as sound data SDD, and sequentially reads the read sound data at a predetermined cycle τ. To output automatically. Then, the supply unit 150 passes the internally output signal through the variable notch filter in accordance with the sound pressure level reduction process designation sent from the control unit 160. Subsequently, the supply unit 150 performs a volume adjustment process according to the volume designation value VLC sent from the control unit 160, and generates an external output sound signal AOS. The external output sound signal AOS thus generated is sent to the external sound output unit 210.
　上記の制御部１６０は、中央処理装置（ＣＰＵ）を備えて構成されている。この制御部１６０は、所定のプログラムを実行することにより、音出力装置１００における車両ＣＲの外部へ向けての外部出力音制御処理を行う。制御部１６０による外部出力音制御処理については、後述する。 The control unit 160 includes a central processing unit (CPU). This control part 160 performs the external output sound control process toward the exterior of vehicle CR in the sound output device 100 by running a predetermined | prescribed program. The external output sound control process by the control unit 160 will be described later.
　次に、上述した音源情報記憶部１１０に記憶された音源情報ＳＳＩについて説明する。この音源情報ＳＳＩは、図４に示されるように、外部音出力部２１０から車両ＣＲの走行中に出力される車両想起音に関する複数の音源データＳＳＤ1，ＳＳＤ2，…，ＳＳＤMを含んでいる。そして、音源データＳＳＤj（ｊ＝１，…，Ｍ）のそれぞれは、図５に示されるように、複数の音データ（音データ＃ｊ１，音データ＃ｊ２，…，音データ＃ｊＮ）から構成されている。これらの音データ＃ｊ１～＃ｊＮの順次読み取りを繰り返しつつ、所定の周期τで読み取り順に出力することにより、音信号が生成されるようになっている。 Next, the sound source information SSI stored in the sound source information storage unit 110 described above will be described. As shown in FIG. 4, the sound source information SSI includes a plurality of sound source data SSD 1 , SSD 2 ,..., SSD M that are output from the external sound output unit 210 while the vehicle CR is traveling. Yes. Each of the sound source data SSD j (j = 1,..., M) is obtained from a plurality of sound data (sound data # j1, sound data # j2,..., Sound data #jN) as shown in FIG. It is configured. A sound signal is generated by repeating the sequential reading of the sound data # j1 to #jN and outputting in order of reading at a predetermined period τ.
　［動作］
　以上のようにして構成された音出力装置１００の動作について、制御部１６０による外部出力音制御処理に主に着目して説明する。 [Operation]
The operation of the sound output device 100 configured as described above will be described mainly focusing on the external output sound control processing by the control unit 160.
　＜参照音源データの特定処理及び低減率情報の決定処理＞
　本実施例では、図６に示されるように、まず、ステップＳ１１において、制御部１６０が、音源情報記憶部１１０に記憶されている複数の音源データの中から、最初の音源データを指定し、第１時間長にわたって当該音源データに対応する外部出力音信号ＡＯＳを生成させるための信号生成制御指令ＰＤＣを生成する。そして、制御部１６０は、当該指令ＰＤＣを供給部１５０へ送る。また、制御部１６０は、音量を一定の所定値とする音量指定値ＶＬＣを生成し、生成された音量指定値ＶＬＣを供給部１５０へ送る。なお、「第１時間長」は、車室内への漏れ音の可聴帯域の音圧レベルの最大値を確実かつ迅速に検出する観点から、実験、シミュレーション、経験等に基づいて、予め定められる。また、「一定の所定値」は、車両ＣＲの走行中における外部出力音の通常の音量であり、実験、シミュレーション、経験等に基づいて、予め定められる。 <Reference sound source data identification processing and reduction rate information determination processing>
In the present embodiment, as shown in FIG. 6, first, in step S <b> 11, the control unit 160 specifies the first sound source data from among the plurality of sound source data stored in the sound source information storage unit 110. A signal generation control command PDC for generating the external output sound signal AOS corresponding to the sound source data over the first time length is generated. Then, the control unit 160 sends the command PDC to the supply unit 150. In addition, the control unit 160 generates a volume designation value VLC having a predetermined volume as a volume, and sends the generated volume designation value VLC to the supply unit 150. The “first time length” is determined in advance based on experiments, simulations, experiences, and the like from the viewpoint of reliably and promptly detecting the maximum value of the sound pressure level of the audible band of the sound leaking into the passenger compartment. Further, the “certain predetermined value” is a normal volume of the external output sound while the vehicle CR is traveling, and is determined in advance based on experiments, simulations, experiences, and the like.
　供給部１５０は、当該指令ＰＤＣを受けると、指定された音源データに含まれる音データを順次読み取る。そして、供給部１５０は、読み取られた音データを、所定の周期τで、順次、内部的に出力しつつ、外部出力音信号ＡＯＳを生成する。こうして生成された外部出力音信号ＡＯＳは、外部音出力部２１０へ送られる。 When the supply unit 150 receives the instruction PDC, the supply unit 150 sequentially reads the sound data included in the designated sound source data. Then, the supply unit 150 generates the external output sound signal AOS while sequentially outputting the read sound data internally at a predetermined cycle τ. The external output sound signal AOS thus generated is sent to the external sound output unit 210.
　当該外部出力音信号ＡＯＳを受けた外部音出力部２１０は、外部出力音信号ＡＯＳに従った音を車外へ出力する。こうして外部音出力部２１０から音が出力された後に、車両ＣＲの車室内に漏れてきた漏れ音を、収音部２３０が収音する。そして、レベル検出部１３０が、収音部２３０による収音結果を取得して、車室内への漏れ音の可聴帯域の音圧レベルを検出する。 Upon receiving the external output sound signal AOS, the external sound output unit 210 outputs a sound according to the external output sound signal AOS to the outside of the vehicle. After the sound is output from the external sound output unit 210 in this way, the sound collection unit 230 collects the leakage sound that has leaked into the vehicle CR cabin. And the level detection part 130 acquires the sound collection result by the sound collection part 230, and detects the sound pressure level of the audible band of the leak sound into a vehicle interior.
　次に、ステップＳ１２において、制御部１６０が、レベル検出部１３０により検出された車室内への漏れ音の可聴帯域の音圧レベルを取得する。この後、処理はステップＳ１３へ進む。ステップＳ１３では、制御部１６０が、音源情報記憶部１１０に記憶されている全ての音源データに対応する音圧レベルを取得したか否かを判定する。この判定の結果が否定的であった場合（ステップＳ１３：Ｎ）には、処理はステップＳ１４へ進む。ステップＳ１４では、制御部１６０が、音源情報記憶部１１０に記憶されている複数の音源データの中から、次の音源データを指定し、第１時間長にわたって当該音源データに対応する外部出力音信号ＡＯＳを生成させるための信号生成制御指令ＰＤＣを生成する。そして、制御部１６０は、当該指令ＰＤＣを供給部１５０へ送る。また、制御部１６０は、音量を一定の所定値とする音量指定値ＶＬＣを生成し、生成された音量指定値ＶＬＣを供給部１５０へ送る。この後、処理はステップＳ１２へ戻る。以後、ステップＳ１３における判定の結果が肯定的となるまで、ステップＳ１２～Ｓ１４の処理が繰り返される。 Next, in step S12, the control unit 160 obtains the sound pressure level in the audible band of the sound leaking into the vehicle compartment detected by the level detection unit 130. Thereafter, the process proceeds to step S13. In step S <b> 13, the control unit 160 determines whether sound pressure levels corresponding to all sound source data stored in the sound source information storage unit 110 have been acquired. If the result of this determination is negative (step S13: N), the process proceeds to step S14. In step S14, the control unit 160 specifies the next sound source data from the plurality of sound source data stored in the sound source information storage unit 110, and the external output sound signal corresponding to the sound source data over the first time length. A signal generation control command PDC for generating AOS is generated. Then, the control unit 160 sends the command PDC to the supply unit 150. In addition, the control unit 160 generates a volume designation value VLC having a predetermined volume as a volume, and sends the generated volume designation value VLC to the supply unit 150. Thereafter, the process returns to step S12. Thereafter, the processes in steps S12 to S14 are repeated until the result of the determination in step S13 becomes affirmative.
　一方、ステップＳ１３における判定の結果が肯定的になると（ステップＳ１３：Ｙ）、処理はステップＳ１５へ進む。このステップＳ１５では、制御部１６０は、取得した音圧レベルの検出結果に基づいて、音源情報記憶部１１０に記憶されている複数の音源データの中で、漏れ音の可聴帯域の音圧レベルの最大値が最も低かったときに使用した音源データを、参照音源データとして特定する。そして、制御部１６０は、供給部１５０に対して、特定された参照音源データを、車両ＣＲの走行中において使用する音源データに指定する。 On the other hand, when the result of the determination in step S13 is affirmative (step S13: Y), the process proceeds to step S15. In step S15, the control unit 160 determines the sound pressure level of the audible band of the leaked sound among the plurality of sound source data stored in the sound source information storage unit 110 based on the acquired detection result of the sound pressure level. The sound source data used when the maximum value is the lowest is specified as the reference sound source data. And the control part 160 designates the identified reference sound source data with respect to the supply part 150 as the sound source data used during driving | running | working of vehicle CR.
　次いで、ステップＳ１６において、制御部１６０が、参照音源データを指定し、第２時間長にわたって当該参照音源データに対応する外部出力音信号ＡＯＳを生成させるための信号生成制御指令ＰＤＣを生成する。そして、制御部１６０は、当該指令ＰＤＣを供給部１５０へ送る。また、制御部１６０は、音量を一定の所定値とする音量指定値ＶＬＣを生成し、生成された音量指定値ＶＬＣを供給部１５０へ送る。なお、「第２時間長」は、車室内への漏れ音の可聴帯域におけるスペクトルを精度良くかつ迅速に取得するとの観点から、実験、シミュレーション、経験等に基づいて、予め定められる。 Next, in step S16, the control unit 160 designates reference sound source data, and generates a signal generation control command PDC for generating an external output sound signal AOS corresponding to the reference sound source data over a second time length. Then, the control unit 160 sends the command PDC to the supply unit 150. In addition, the control unit 160 generates a volume designation value VLC having a predetermined volume as a volume, and sends the generated volume designation value VLC to the supply unit 150. The “second time length” is determined in advance based on experiments, simulations, experiences, and the like from the viewpoint of accurately and quickly acquiring a spectrum in the audible band of the leakage sound into the passenger compartment.
　供給部１５０は、当該指令ＰＤＣを受けると、参照音源データに対応する外部出力音信号ＡＯＳを生成し、外部音出力部２１０へ送る。そして、外部音出力部２１０から音が出力された後に、車両ＣＲの車室内に漏れてきた漏れ音を、収音部２３０が収音する。引き続き、レベル検出部１３０が、収音部２３０による収音結果を取得して、車室内への漏れ音の可聴帯域の音圧レベルを検出する。 When the supply unit 150 receives the command PDC, the supply unit 150 generates an external output sound signal AOS corresponding to the reference sound source data, and sends the external output sound signal AOS to the external sound output unit 210. Then, after the sound is output from the external sound output unit 210, the sound collection unit 230 collects the leakage sound that has leaked into the vehicle interior of the vehicle CR. Subsequently, the level detection unit 130 acquires the sound collection result by the sound collection unit 230 and detects the sound pressure level of the audible band of the leaked sound into the vehicle interior.
　次いで、ステップＳ１７において、制御部１６０が、レベル検出部１３０による検出結果に対して高速フーリエ変換処理を行い、音圧レベルが所定値以上となる周波数帯域、及び、当該周波数帯域における音圧レベル分布を検出する。この後、処理はステップＳ１８へ進む。このステップＳ１８では、制御部１６０が、当該検出結果に基づいて、走行中に外部音出力部２１０から出力される参照音源データに対応する外部出力音の音圧レベルを極力維持しつつ、車室内への漏れ音が、可聴帯域の全領域において、当該所定値未満とさせるための音圧レベル低減処理を供給部１５０にさせるための低減率情報を決定する。そして、制御部１６０は、決定された低減率情報を供給部１５０に対して指定する。 Next, in step S17, the control unit 160 performs a fast Fourier transform process on the detection result by the level detection unit 130, and the frequency band in which the sound pressure level is a predetermined value or more, and the sound pressure level distribution in the frequency band. Is detected. Thereafter, the process proceeds to step S18. In step S18, the control unit 160 maintains the sound pressure level of the external output sound corresponding to the reference sound source data output from the external sound output unit 210 during traveling based on the detection result as much as possible. Decrease rate information for causing the supply unit 150 to perform sound pressure level reduction processing for causing the sound to leak to be less than the predetermined value in the entire region of the audible band is determined. Then, the control unit 160 specifies the determined reduction rate information for the supply unit 150.
　＜車両ＣＲの走行中における外部出力音発生処理＞
　車両ＣＲの走行中における外部出力音制御処理に際しては、特定された参照音源データ、及び、決定された低減率情報の供給部１５０に対する指定が行われた後、制御部１６０が、車両想起音信号の生成開始の指令である信号生成制御指令ＰＤＣを生成する。そして、制御部１６０は、信号生成制御指令ＰＤＣを供給部１５０へ送る。また、制御部１６０は、走行情報収集部１２０から送られた車速情報ＳＰに基づいて、音量指定値ＶＬＣを生成し、生成された音量指定値ＶＬＣを供給部１５０へ送る。なお、音量指定値ＶＬＣは、車速が相対的に速いほど、外部出力音の音量が相対的に大きくなる指定となっている。 <External output sound generation processing during travel of vehicle CR>
In the external output sound control process during the traveling of the vehicle CR, after the specified reference sound source data and the determined reduction rate information are designated to the supply unit 150, the control unit 160 performs the vehicle recall sound signal. A signal generation control command PDC, which is a command to start generation of. Then, the control unit 160 sends a signal generation control command PDC to the supply unit 150. In addition, the control unit 160 generates a volume designated value VLC based on the vehicle speed information SP sent from the travel information collecting unit 120 and sends the generated volume designated value VLC to the supply unit 150. Note that the volume specification value VLC is specified such that the volume of the external output sound is relatively increased as the vehicle speed is relatively higher.
　供給部１５０は、上述した信号生成制御指令ＰＤＣ及び音量指定値ＶＬＣを受けると、指定された参照音源データに含まれる音データを順次読み取る。そして、供給部１５０は、読み取られた音データを、所定の周期τで、順次、内部的に出力する。引き続き、供給部１５０は、指定された音圧レベルの低減率情報に従って、内部的に出力した信号を可変ノッチフィルタに通過させる。そして、供給部１５０は、制御部１６０から送られた音量指定値ＶＬＣに従った音量調整処理を施して、外部出力音信号ＡＯＳを生成する。こうして生成された外部出力音信号ＡＯＳは、外部音出力部２１０へ送られる。 When the supply unit 150 receives the signal generation control command PDC and the sound volume designation value VLC described above, the supply unit 150 sequentially reads the sound data included in the designated reference sound source data. Then, the supply unit 150 sequentially outputs the read sound data internally at a predetermined cycle τ. Subsequently, the supply unit 150 passes the internally output signal through the variable notch filter according to the specified sound pressure level reduction rate information. Then, the supply unit 150 performs a volume adjustment process according to the volume designation value VLC sent from the control unit 160, and generates an external output sound signal AOS. The external output sound signal AOS thus generated is sent to the external sound output unit 210.
　供給部１５０から送られた外部出力音信号ＡＯＳを受けた外部音出力部２１０は、外部出力音信号ＡＯＳに従った音を車外へ出力する。この結果、制御部１６０による外部出力音制御処理に従って、車両想起音が車外へ出力される。 The external sound output unit 210 that has received the external output sound signal AOS sent from the supply unit 150 outputs a sound according to the external output sound signal AOS to the outside of the vehicle. As a result, according to the external output sound control process by the control unit 160, the vehicle recall sound is output outside the vehicle.
　以上説明したように、本実施例では、制御部１６０が、車両ＣＲの走行中における外部出力音信号の生成に先立って、供給部１５０に対し、音源情報記憶部１１０に記憶されている複数の音源データのそれぞれに対応する外部出力音信号を順次、生成させる制御を行う。供給部１５０により生成された外部出力音信号は、外部音出力部２１０に送られ、外部出力音信号に従った音が、車両ＣＲの外部に向けて出力される。 As described above, in this embodiment, the control unit 160 stores a plurality of information stored in the sound source information storage unit 110 with respect to the supply unit 150 prior to the generation of the external output sound signal during the traveling of the vehicle CR. Control for sequentially generating external output sound signals corresponding to each of the sound source data is performed. The external output sound signal generated by the supply unit 150 is sent to the external sound output unit 210, and the sound according to the external output sound signal is output toward the outside of the vehicle CR.
　こうして外部音出力部２１０から音が出力された後に、車両ＣＲの車室内に漏れてきた漏れ音を、収音部２３０が収音する。引き続き、レベル検出部１３０が、収音部２３０による収音結果を取得し、車室内への漏れ音の可聴帯域の音圧レベルを検出する。そして、制御部１６０が、レベル検出部１３０によるレベル検出結果に基づいて、音源情報記憶部１１０に記憶されている複数の音源データの中で、漏れ音の可聴帯域の音圧レベルの最大値が最も低かったときに使用した音源データを特定する。引き続き、制御部１６０は、当該特定された音源データを、車両ＣＲの走行中において使用する参照音源データとして、供給部１５０に対して指定する。 Thus, after the sound is output from the external sound output unit 210, the sound collection unit 230 collects the leakage sound that has leaked into the passenger compartment of the vehicle CR. Subsequently, the level detection unit 130 acquires the sound collection result by the sound collection unit 230 and detects the sound pressure level of the audible band of the leaked sound into the vehicle interior. Then, based on the level detection result by the level detection unit 130, the control unit 160 determines the maximum value of the sound pressure level in the audible band of the leaked sound among the plurality of sound source data stored in the sound source information storage unit 110. Identify the sound source data used when it was the lowest. Subsequently, the control unit 160 designates the specified sound source data to the supply unit 150 as reference sound source data to be used while the vehicle CR is traveling.
　また、制御部１６０は、参照音源データに対応する外部出力音の音圧レベルが所定値以上となる周波数帯域、及び、当該周波数帯域における音圧レベル分布を検出する。そして、制御部１６０が、当該検出結果に基づいて、走行中に外部音出力部２１０から出力される参照音源データに対応する外部出力音の音圧レベルを極力維持しつつ、車室内への漏れ音が、可聴帯域の全領域において、当該所定値未満とさせるための音圧レベル低減処理を供給部１５０にさせるための低減率情報を決定する。引き続き、制御部１６０は、決定された低減率情報に従って、供給部１５０に対して指定する。 Further, the control unit 160 detects a frequency band in which the sound pressure level of the external output sound corresponding to the reference sound source data is a predetermined value or more, and a sound pressure level distribution in the frequency band. Based on the detection result, the control unit 160 leaks into the vehicle interior while maintaining the sound pressure level of the external output sound corresponding to the reference sound source data output from the external sound output unit 210 during traveling as much as possible. The reduction rate information for causing the supply unit 150 to perform a sound pressure level reduction process for causing the sound to be less than the predetermined value in the entire region of the audible band is determined. Subsequently, the control unit 160 specifies the supply unit 150 according to the determined reduction rate information.
　そして、車両ＣＲの走行中においては、特定された参照音源データ、及び、決定された低減率情報の供給部１５０に対する指定が行われた後、制御部１６０が、外部出力音信号の生成開始の指令を供給部１５０へ送る。かかる指令を受けると、供給部１５０は、指定された参照音源データに対し、決定された低減率情報に従った音圧レベルの低減処理を行う。この結果、車室内への漏れ音の可聴帯域における音圧レベルが低減された車両想起音が、車外へ出力される。 Then, while the vehicle CR is traveling, after the specified reference sound source data and the determined reduction rate information are specified for the supply unit 150, the control unit 160 starts generation of the external output sound signal. The command is sent to the supply unit 150. Upon receiving such a command, the supply unit 150 performs a sound pressure level reduction process according to the determined reduction rate information for the designated reference sound source data. As a result, the vehicle recall sound in which the sound pressure level in the audible band of the sound leaking into the vehicle interior is reduced is output outside the vehicle.
　このため、音源情報記憶部１１０に記憶されている複数の音源データの中から、車種や車室内環境に適した一の参照音源データの特定、並びに、車室内への漏れ音が、可聴帯域の全領域において、所定値未満とさせるための音圧レベル低減処理を供給部１５０にさせるための低減率情報の決定が自動で行われる。この結果、利用者の利便性を向上させることができる。 For this reason, from among the plurality of sound source data stored in the sound source information storage unit 110, the identification of one reference sound source data suitable for the vehicle type and the vehicle interior environment and the sound leaking into the vehicle interior are in the audible band. In all areas, the determination of the reduction rate information for causing the supply unit 150 to perform the sound pressure level reduction process for making it less than the predetermined value is automatically performed. As a result, user convenience can be improved.
　したがって、本実施例によれば、車両の内外に対して車両想起音の適正化を図ることができる。 Therefore, according to the present embodiment, it is possible to optimize the vehicle recall sound for the inside and outside of the vehicle.
　［実施例の変形］
　本発明は、上記の実施例に限定されるものではなく、様々な変形が可能である。 [Modification of Example]
The present invention is not limited to the above-described embodiments, and various modifications can be made.
　例えば、上記の実施例では、音出力装置１００の構成要素が全て車両ＣＲに搭載されるようにしたが、上述した第２実施形態のように、車両ＣＲの搭載される端末装置と通信可能なサーバ装置が、音出力装置１００の構成要素の一部を備えるようにしてもよい。 For example, in the above embodiment, all the components of the sound output device 100 are mounted on the vehicle CR, but can communicate with the terminal device mounted on the vehicle CR as in the second embodiment described above. The server device may include some of the components of the sound output device 100.
　また、上記の実施例では、制御部は、車両ＣＲの走行中において使用する参照音源データの特定した後に、当該参照音源データに対応する外部出力音の音圧レベルを極力維持しつつ、車室内への漏れ音が、可聴帯域の全領域において、所定値未満とさせるための音圧レベル低減処理を供給部にさせるための低減率情報を決定した。これに対して、制御部は、車両ＣＲの走行中において使用する参照音源データの特定のみを行うようにしてもよい。この場合には、制御部による音圧レベルの低減率情報の決定処理を省略することができる。また、この場合には、外部出力音信号をスイープ信号とすることができる。 In the above embodiment, the control unit specifies the reference sound source data to be used while the vehicle CR is traveling, and then maintains the sound pressure level of the external output sound corresponding to the reference sound source data as much as possible. The reduction rate information for causing the supply unit to perform sound pressure level reduction processing for causing the sound leaking to be less than a predetermined value in the entire range of the audible band is determined. In contrast, the control unit may specify only the reference sound source data to be used while the vehicle CR is traveling. In this case, the determination process of the sound pressure level reduction rate information by the control unit can be omitted. In this case, the external output sound signal can be a sweep signal.
　また、上記の実施例における「参照音源データの特定処理及び低減率情報の決定処理」を行うに際して、予め暗騒音レベルを測定するようにしてもよい。この場合には、レベル検出部による検出結果から予め測定した暗騒音レベルを差し引いた検出結果に基づいて、参照音源データの特定処理及び低減率情報の決定処理を行うことができる。 Also, the background noise level may be measured in advance when performing the “reference sound source data identification process and reduction rate information determination process” in the above embodiment. In this case, the reference sound source data specifying process and the reduction rate information determining process can be performed based on the detection result obtained by subtracting the background noise level measured in advance from the detection result of the level detection unit.
　また、上記の実施例では、音出力装置１００は外部音出力部２１０を備えないようにしたが、利用可能な既存の外部音出力部２１０が無い場合には、音出力装置１００が外部音出力部を備える構成としてもよい。 In the above embodiment, the sound output device 100 is not provided with the external sound output unit 210. However, when there is no existing external sound output unit 210 that can be used, the sound output device 100 outputs the external sound. It is good also as a structure provided with a part.
　また、上記の実施例では、音出力装置１００は収音部２３０を備えないようにしたが、利用可能な既存の収音部２３０が無い場合には、音出力装置１００が収音部を備える構成としてもよい。 In the above embodiment, the sound output device 100 is not provided with the sound collection unit 230. However, when there is no existing sound collection unit 230 that can be used, the sound output device 100 includes the sound collection unit. It is good also as a structure.
　また、上記の実施例では、記憶部には、複数の音源データが記憶されるとしたが、１つの音源データを記憶させるようにしてもよい。この場合には、制御部による車両ＣＲの走行中において参照する一の音源データの特定処理を省略することができる。 In the above embodiment, a plurality of sound source data is stored in the storage unit, but one sound source data may be stored. In this case, it is possible to omit one sound source data identification process that is referred to during the traveling of the vehicle CR by the control unit.
　また、上記の実施例では、音出力装置１００が備える音源情報記憶部１１０は、音源情報ＳＳＩを記憶するようにしたが、当該情報を記憶した既存の記憶部が存在する場合には、当該既存の記憶部を利用するようにし、音出力装置１００が記憶部を備えない構成としてもよい。 In the above embodiment, the sound source information storage unit 110 included in the sound output device 100 stores the sound source information SSI. If there is an existing storage unit that stores the information, The sound output device 100 may be configured not to include the storage unit.
　また、上記の実施例では、供給部は、音源データを構成する音データを順次読み取り、所定の周期τで順次出力するようにしたが、当該周期τを車速情報ＳＰに基づいて変化させることで、車速に応じて異なる周波数特性を有する音を出力させるようにしてもよい。 In the above-described embodiment, the supply unit sequentially reads the sound data constituting the sound source data and sequentially outputs the sound data at a predetermined period τ. However, by changing the period τ based on the vehicle speed information SP. A sound having different frequency characteristics depending on the vehicle speed may be output.
　また、上記の実施例では、外部音出力部は、左右のスピーカから外部出力音を出力するようにした。これに対して、走行中の道路種別等に応じて、例えば、車両の左側に歩道がある場合には、左スピーカからのみ外部出力音を出力するようにしてもよい。 In the above embodiment, the external sound output unit outputs the external output sound from the left and right speakers. On the other hand, for example, when there is a sidewalk on the left side of the vehicle, an external output sound may be output only from the left speaker according to the type of road that is running.
　なお、上記の実施例では、制御部１６０がプログラムの実行により、外部出力音発生のための制御処理を行うようにしたが、制御部１６０の全部又は一部を、専用のＬＳＩ（Large Scale Integrated circuit）等を用いたハードウェアにより行うようにしてもよい。 In the above embodiment, the control unit 160 performs a control process for generating an external output sound by executing a program. However, all or a part of the control unit 160 may be a dedicated LSI (Large Scale Integrated). circuit) or the like.
　また、制御部１６０が実行するプログラムは、ＣＤ－ＲＯＭ，ＤＶＤ等の可搬型記録媒体に記録された形態で取得されるようにしてもよいし、インターネットなどのネットワークを介した配信の形態で取得されるようにしてもよい。 The program executed by the control unit 160 may be acquired in a form recorded on a portable recording medium such as a CD-ROM or DVD, or may be acquired in a form distributed via a network such as the Internet. You may be made to do.

Claims (8)

  1. 　車両の外部に向けて音を出力する外部音出力部に、外部出力音信号を生成して供給する供給部と；
    　前記外部音出力部から出力された後に、前記車両の車室内に漏れてきた漏れ音の可聴帯域の音圧レベルを検出するレベル検出部と；
    　前記レベル検出部の検出結果に基づいて、前記供給部による前記外部出力音信号の生成を制御する制御部と；
    　を備えることを特徴とする音出力装置。     A supply unit that generates and supplies an external output sound signal to an external sound output unit that outputs sound toward the outside of the vehicle;
    A level detection unit for detecting a sound pressure level in an audible band of leaked sound leaked into the vehicle interior of the vehicle after being output from the external sound output unit;
    A control unit that controls generation of the external output sound signal by the supply unit based on a detection result of the level detection unit;
    A sound output device comprising:
  2. 　前記制御部は、前記レベル検出部の検出結果に基づいて、記憶部に記憶されている複数の音源データの中から、前記車両の走行中において参照する一の音源データを前記供給部に選択させる、ことを特徴とする請求項１に記載の音出力装置。 The control unit causes the supply unit to select one sound source data to be referred to during traveling of the vehicle from a plurality of sound source data stored in the storage unit based on a detection result of the level detection unit. The sound output device according to claim 1.
  3. 　前記制御部は、前記車両の走行中における前記外部出力音信号の生成に先立って、
    　　前記供給部に対して、前記複数の音源データのそれぞれに対応する外部出力音信号を順次生成させる制御を行い、
    　　前記レベル検出部の検出結果に基づいて、前記複数の音源データの中で、前記漏れ音の可聴帯域の音圧レベルが最も低かったときに参照した音源データを、前記供給部に選択させる、
    　ことを特徴とする請求項２に記載の音出力装置。     Prior to the generation of the external output sound signal during travel of the vehicle, the control unit,
    The supply unit is controlled to sequentially generate external output sound signals corresponding to each of the plurality of sound source data,
    Based on the detection result of the level detection unit, the sound source data referred to when the sound pressure level of the audible band of the leaked sound is the lowest among the plurality of sound source data is selected by the supply unit,
    The sound output device according to claim 2.
  4. 　前記制御部は、前記車両の走行中における前記外部出力音信号の生成に先立って、
    　　前記レベル検出部の検出結果に基づいて、前記外部出力音信号を生成するときに音圧レベルを低減させる周波数帯域、及び、前記周波数帯域における音圧レベルの低減率を決定し、
    　　前記決定された前記周波数帯域における音圧レベルの低減率に従って、前記供給部に音圧レベル低減処理をさせる、
    　ことを特徴とする請求項１～３のいずれか一項に記載の音出力装置。     Prior to the generation of the external output sound signal during travel of the vehicle, the control unit,
    Based on the detection result of the level detection unit, a frequency band for reducing the sound pressure level when generating the external output sound signal, and a sound pressure level reduction rate in the frequency band,
    According to the sound pressure level reduction rate in the determined frequency band, the supply unit is caused to perform a sound pressure level reduction process.
    The sound output device according to any one of claims 1 to 3, wherein:
  5. 　前記制御部は、
    　　前記レベル検出部により検出された音圧レベルが所定値以上となる周波数帯域、及び、前記周波数帯域における音圧レベル分布を検出し、
    　　前記検出された前記所定値以上となる周波数帯域、及び、前記周波数帯域における音圧レベル分布に基づいて、前記供給部に前記音圧レベル低減処理をさせる、
    　ことを特徴とする請求項４に記載の音出力装置。     The controller is
    A frequency band in which the sound pressure level detected by the level detection unit is a predetermined value or more, and a sound pressure level distribution in the frequency band;
    Based on the detected frequency band equal to or higher than the predetermined value and the sound pressure level distribution in the frequency band, the supply unit is caused to perform the sound pressure level reduction process.
    The sound output device according to claim 4.
  6. 　外部出力音信号を生成して、車両の外部に向けて音を出力する外部音出力部へ供給する供給部と；前記供給部による前記外部出力音信号の生成を制御する制御部と；を備える音出力装置において使用される出力音制御方法であって、
    　前記外部音出力部から出力された後に、前記車両の車室内に漏れてきた漏れ音の可聴帯域の音圧レベルを検出するレベル検出工程と；
    　前記レベル検出工程における検出結果に基づいて、前記制御部が前記供給部による前記外部出力音信号の生成を制御する制御工程と；
    　を備えることを特徴とする出力音制御方法。     A supply unit that generates an external output sound signal and supplies the sound to an external sound output unit that outputs the sound toward the outside of the vehicle; and a control unit that controls generation of the external output sound signal by the supply unit. An output sound control method used in a sound output device,
    A level detection step of detecting a sound pressure level in an audible band of leaked sound leaked into the vehicle interior of the vehicle after being output from the external sound output unit;
    A control step in which the control unit controls generation of the external output sound signal by the supply unit based on a detection result in the level detection step;
    An output sound control method comprising:
  7. 　請求項６に記載の出力音制御方法を演算部に実行させる、ことを特徴とする出力音制御プログラム。 An output sound control program for causing an arithmetic unit to execute the output sound control method according to claim 6.
  8. 　請求項７に記載の出力音制御プログラムが、演算部により読み取り可能に記録されている、ことを特徴とする記録媒体。 8. A recording medium in which the output sound control program according to claim 7 is recorded so as to be readable by an arithmetic unit.
PCT/JP2011/076295 2011-11-15 2011-11-15 Sound output device and output sound control method WO2013073008A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011030422A1 (en) * 2009-09-10 2011-03-17 パイオニア株式会社 Noise reduction device
JP2011051446A (en) * 2009-09-01 2011-03-17 Kazuhiro Yamauchi Sound generating system and device
JP2011183964A (en) * 2010-03-09 2011-09-22 Sumitomo Electric Ind Ltd Alarm sound generator of electric automobile

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011051446A (en) * 2009-09-01 2011-03-17 Kazuhiro Yamauchi Sound generating system and device
WO2011030422A1 (en) * 2009-09-10 2011-03-17 パイオニア株式会社 Noise reduction device
JP2011183964A (en) * 2010-03-09 2011-09-22 Sumitomo Electric Ind Ltd Alarm sound generator of electric automobile

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