CN116568623A - Sound system for elevator - Google Patents

Abstract

An elevator sound system is provided with: a speaker system disposed on a ceiling of an inner space of the elevator car; a storage unit that stores sound content emitted from a speaker system; a sound field control unit for reproducing the sound content and causing the speaker system to radiate the sound content to the inner space of the car; and a detection unit provided in the car for detecting a physical quantity indicating a traveling state of the car, wherein the sound field control unit determines the traveling state of the car based on the physical quantity detected by the detection unit, and adjusts the sound pressure level of the sound content in accordance with the traveling state of the car.

Description

Sound system for elevator

Technical Field

The present invention relates to an elevator sound system for radiating sound from a space in a car of an elevator.

Background

In the car of the existing elevator, a speaker is provided for guiding voice to a user in the car. In addition, an intercom is provided in the car, and the intercom is used for enabling a user to communicate with an external person in an emergency. These speakers and interphones are provided on, for example, car operating panels or car ceilings.

In addition, in a conventional elevator, there is proposed an elevator that plays BGM (Background Music) in a car in addition to voice guidance (for example, refer to patent document 1). In this elevator, a speaker and a BGM playback device that plays back BGM are provided in the car.

In the elevator described in patent document 1, the BGM playback device is electrically connected to an elevator control device, and a button information signal indicating a button operation by a user is input from the elevator control device. The BGM playback device controls playback of BGM based on a button information signal from the elevator control device. Specifically, when a user wants to listen to BGM being reproduced from the beginning while the elevator is traveling, the BGM can be reproduced from the beginning by pressing the door opening button once. In addition, when the user wants to skip a dislike BGM and listen to the next BGM, the next BGM can be reproduced from the beginning by pressing the door close button once during the elevator traveling. In addition, when the user does not want to listen to BGM during playback, the playback can be stopped by pressing the door opening button twice or more during elevator travel.

Generally, the space within the car of an elevator is required to maintain a certain degree of tightness and quietness. In a special confined space such as an elevator car space, which is different from a normal living space, it is difficult for users and acquainted people to talk together. As a result, many users are "embarrassed" and "uncomfortable", thereby creating stress.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 2009-35340

Disclosure of Invention

Problems to be solved by the invention

As described above, in the elevator described in patent document 1, since the operation buttons in the elevator are used for the reproduction operation or the stop operation of BGM, the user can freely control the reproduction and stop of BGM by operating the operation buttons. Therefore, in some cases, BGM reproduction may be performed at random due to miscreants of some users. In this case, other users who are on the same line may feel uncomfortable more. In this way, in the BGM playback of patent document 1, the pressure caused by the "embarrassment" and the "uncomfortable feeling" of the user may not be necessarily reduced, and depending on the situation, the pressure of the user may be increased.

In the elevator described in patent document 1, the BGM playback device is configured to acquire a button information signal from an elevator control device. Therefore, when the BGM playback device is provided, it is necessary to electrically connect the BGM playback device and the elevator control device using a signal line. Since the wiring operation of the signal lines is complicated and requires technical knowledge of the operator, it is actually difficult to mount the BGM playback device on an existing elevator.

In patent document 1, since the volume at the time of BGM reproduction is fixed, BGM is reproduced at the same volume even when the elevator stops at a stop floor and the user is riding on or off. Therefore, the voice broadcast and BGM important to the user are covered, and the user may miss the necessary information. In addition, the following problems occur: the reproduction sound of BGM is also emitted to the landing of the stop floor, and this sound emission becomes noise for a person who does not use an elevator.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an elevator sound system that can be easily installed without interfering with the voice broadcast of the user and can provide sound content for realizing the pressure reduction of the user.

Means for solving the problems

The sound system for an elevator of the present invention comprises: a speaker system disposed on a ceiling of an inner space of the elevator car; a storage unit that stores sound content emitted from the speaker system; a sound field control unit that reproduces the sound content and causes the speaker system to radiate the sound content to the interior space of the car; and a detection unit provided in the car and detecting a physical quantity indicating a traveling state of the car, wherein the sound field control unit determines the traveling state of the car based on the physical quantity detected by the detection unit, and adjusts the sound pressure level of the sound content in accordance with the traveling state of the car.

Effects of the invention

According to the elevator sound system of the present invention, the sound pressure level of the sound content is adjusted according to the traveling state of the car based on the detection result of the detection unit, so that the sound system does not need information from the outside, is easy to install, does not interfere with the voice broadcast to the user, and can provide the sound content for realizing the pressure reduction of the user.

Drawings

Fig. 1 is a perspective view showing the structure of an elevator 1 according to embodiment 1.

Fig. 2 is a diagram showing an internal space of the car 5 of the elevator 1 according to embodiment 1.

Fig. 3 is a diagram showing an example of an additional sound inserted into audio content for each season and each life time period.

Fig. 4 is a front view showing the configuration of the acoustic system 13 according to embodiment 1.

Fig. 5 is a plan view showing the arrangement of speaker box 20 of sound system 13 according to embodiment 1.

Fig. 6 is a side view showing an example of the structure of speaker box 20 according to embodiment 1.

Fig. 7 is a front view showing the structure of the speaker box 20 of fig. 6.

Fig. 8 is a side view showing a configuration of a modification of speaker box 20 according to embodiment 1.

Fig. 9 is a front view showing the structure of the speaker box 20 of fig. 8.

Fig. 10 is a front view schematically showing a configuration of a modification of the acoustic system 13 of embodiment 1.

Fig. 11 is a plan view schematically showing a configuration of another modification of the acoustic system 13 of embodiment 1.

Fig. 12 is a front view showing the arrangement position of the detection portion 21 d.

Fig. 13 is a plan view showing the arrangement position of the detection unit 21 d.

Fig. 14 is a perspective view showing the structure of the detection unit 21 d.

Fig. 15 is a diagram showing an example of waveforms of detection results of the detection unit 21d in different directions.

Fig. 16 is a diagram showing an output waveform of the detection unit 21d used for the determination by the sound field control unit 21 a.

Fig. 17 is a diagram showing a relationship between the output of the detection unit 21d and the traveling speed of the car 5.

Fig. 18 is a diagram showing a change in state of the diaphragm 211a of the sensor element 211 provided in the detection unit 21d when the car 5 is lifted.

Fig. 19 is a diagram showing waveforms of output voltages when acceleration of the car 5 at the time of ascent is detected by the detection unit 21 d.

Fig. 20 is a diagram showing a change in sound pressure level of sound content when the car 5 is lifted.

Fig. 21 is a diagram showing the situation of the diaphragm 211a when the car 5 is lowered.

Fig. 22 is a diagram showing a relationship between the output voltage of the detecting unit 21d and the traveling speed of the car 5 when the car 5 is lowered.

Fig. 23 is a diagram showing a relationship between a change in sound pressure level of sound content and an output voltage of the detection unit 21d when the car 5 is lowered.

Fig. 24 is a diagram showing a threshold value set for the output voltage of the detection unit 21 d.

Fig. 25 is a diagram showing a threshold value set for the output voltage of the detection unit 21 d.

Fig. 26 is a diagram showing a configuration of a modification of the acoustic system 13 of embodiment 1.

Fig. 27 is a diagram showing a relationship between the detection result and the sound pressure level of the acoustic content in the case where the detection unit 21d is a barometric sensor.

Detailed Description

Hereinafter, an embodiment of an elevator sound system according to the present invention will be described with reference to the drawings. The present invention is not limited to the following embodiments, and various modifications can be made without departing from the spirit of the present invention. The present invention includes combinations of all the structures that can be combined among the structures shown in the following embodiments and modifications thereof. In the drawings, the same reference numerals are used for the same or corresponding portions, and are common throughout the specification. In the drawings, the relative dimensional relationship, shape, and the like of the constituent members may be different from the actual ones.

Embodiment 1.

The sound system for an elevator according to embodiment 1 is applied to a space in a car of an elevator in which a certain degree of tightness and quietness are required to be maintained. The space in the car of the elevator is a space where two or more persons can coexist, and has a structure in which the entrance and the exit are closed, and in principle, the space in which the person existing inside cannot go outside for a certain time.

Fig. 1 is a perspective view showing the structure of an elevator 1 according to embodiment 1. As shown in fig. 1, an elevator 1 is installed in a building, and a car 5 is moved up or down in a hoistway 2. A hoisting machine 3 is provided at an upper portion of the hoistway 2. A main rope 4 is suspended on a sheave 3a provided in the hoisting machine 3. Both ends of the main rope 4 are connected to the car 5 and the counterweight 6, respectively. The car 5 and the counterweight 6 are suspended in a bucket manner from the sheave 3a by means of the main ropes 4. An elevator control panel 7 is provided at an upper portion of the hoistway 2. The elevator control panel 7 is connected to the hoisting machine 3 via a communication line and to the car 5 via a control cable 8. The control cable 8 transmits electric power and control signals to the car 5. The control cable 8 is also called a tail cable. In this way, the elevator 1 is constituted by the hoisting machine 3, the main rope 4, the car 5, the counterweight 6, the elevator control panel 7, and a car control device 9 described later.

The car 5 is composed of a floor 5b, a ceiling plate 5c, and 4 side plates 5a forming the periphery between the floor 5b and the ceiling plate 5 c. The 4 side plates 5a are disposed on the right, left, front and rear sides of the car 5, respectively. Further, a car door 5d is provided to the front side plate 5a of the 4 side plates 5 a. When the car 5 stops at a landing on each floor of the building, the car door 5d engages with a landing door (not shown) provided at the landing to perform a door opening and closing operation.

As shown in fig. 1, a car control device 9 and an acoustic field control device 21 are provided on the upper surface of a ceiling plate 5c of the car 5. The car control device 9 controls the operation of each device provided in the car 5. Examples of the devices provided in the car 5 include a car door 5d, a lighting device 5e (see fig. 2), and a car operating panel 5f (see fig. 2). The sound field control device 21 controls the overall operation of the elevator sound system 13 (see fig. 4) described later so that a three-dimensional sound field 27 (see fig. 4) is formed in the entire inner space of the car 5. In the following, the elevator sound system 13 will be simply referred to as the sound system 13.

As shown in fig. 1, a suspended ceiling 10 is fixed to the lower surface of a ceiling plate 5c of the car 5. The suspended ceiling 10 is located in the inner space of the car 5. The suspended ceiling 10 has a rectangular parallelepiped shape. The suspended ceiling 10 has a lower surface 10b and 4 side surfaces 10a (see fig. 2). The upper opening of the suspended ceiling 10 is not limited to this, and the suspended ceiling 10 may further have an upper surface disposed opposite to the lower surface 10 b. A lighting device 5e (see fig. 2), an emergency speaker 5g (see fig. 2), and a speaker system 22 of the sound system 13 (see fig. 4) are provided in the internal space of the suspended ceiling 10. In the above description, the sound field control device 21 is described as being provided on the upper surface of the ceiling plate 5c of the car 5 as shown in fig. 1, but the sound field control device 21 may be disposed in the internal space of the suspended ceiling 10 together with the speaker system 22. As shown in fig. 2, a gap 11 (see fig. 2 and 4) is provided between the side surface 10a of the suspended ceiling 10 and the side plate 5a of the car 5. In the following, the predetermined distance D is referred to as a 1 st distance D.

In the example of fig. 1, the case where the elevator 1 is a rope elevator is shown, but the present invention is not limited to this case. The elevator 1 may be another type of elevator such as a linear motor elevator.

Fig. 2 is a diagram showing an internal space of the car 5 of the elevator 1 according to embodiment 1. As shown in fig. 2, the inner space of the car 5 is defined by 4 side plates 5a, a floor 5b, and a lower surface 10b of the suspended ceiling 10. The inner space of the car 5 is, for example, rectangular parallelepiped-shaped except for the portion of the space 11. The floor 5b has a rectangular plane disposed in the horizontal direction. Each side plate 5a has a rectangular plane provided in the vertical direction. Here, the vertical direction is, for example, a vertical direction. The lower surface 10b of the suspended ceiling 10 is disposed to face the floor 5 b. The lower surface 10b of the suspended ceiling 10 is constituted by a rectangular plane provided in the horizontal direction. The suspended ceiling 10 is provided with a lighting device 5e. The main body of the lighting device 5e is provided in the internal space of the suspended ceiling 10. The lighting device 5e is, for example, an LED lighting device. As shown in fig. 2, the irradiation surface 5ea of the illumination device 5e faces the floor 5 b. The illumination device 5e illuminates the inner space of the car 5 with light irradiated from the irradiation surface 5 ea. The suspended ceiling 10 is provided with an emergency speaker 5g, and the emergency speaker 5g is used to play emergency contacts from a management room of a building. The emergency speaker 5g may be used not only for emergency communication but also for playing a voice broadcast to the user such as "door is about to be closed".

As described above, the car door 5d is provided to the front side plate 5a of the 4 side plates 5 a. As shown in fig. 2, a car operating panel 5f is provided on the front side plate 5 a. The car operation panel 5f is provided with a plurality of car call registration buttons provided corresponding to the floors and a door opening/closing button for controlling the opening/closing operation of the car door 5d. The car call registration button and the door opening/closing button are operated by a user. Further, an intercom device 5h is provided on the car operating panel 5f, and the intercom device 5h is used for communication with the outside by a user in an emergency or the like.

As shown in fig. 2, the car control device 9 is connected to the elevator control panel 7 via, for example, a control cable 8 (see fig. 1). As shown in fig. 2, the car control device 9 includes an input unit 9a, a control unit 9b, an output unit 9c, and a storage unit 9d. The input unit 9a inputs a control signal from the elevator control panel 7 to the control unit 9b. The control unit 9b performs operation control of each device provided in the car 5 based on the control signal. The output unit 9c outputs a drive signal to each device provided in the car 5 under the control of the control unit 9b. Further, under the control of the control unit 9b, the output unit 9c transmits a signal such as a car call registration input by the user to the car operation panel 5f to the elevator control panel 7. The elevator control panel 7 performs processing such as target floor registration based on the signal, and operates the elevator 1. The storage unit 9d stores the calculation result of the control unit 9b, various data and programs used for the control of the control unit 9b, and the like.

The sound field control device 21 is one of the constituent elements of the sound system 13. The sound field control device 21 and a speaker system 22 (see fig. 4) described later constitute the sound system 13. The sound field control device 21 and the speaker system 22 are not electrically connected to the car control device 9 and the elevator control panel 7. The car control device 9 and the elevator control panel 7 are operation systems for operating the elevator 1. In this way, since the acoustic system 13 is a device independent of the operation system for operating the elevator 1, wiring work and the like with the operation system are not required, and thus the acoustic system can be easily installed in the existing elevator 1.

As shown in fig. 2, the sound field control device 21 has a sound field control section 21a, an output section 21b, a storage section 21c, and a detection section 21d. The sound field control device 21 further includes a timer unit 21e, as necessary. The sound field control unit 21a controls the operation of the entire sound system 13 so that a three-dimensional sound field 27 with high sound quality is formed in the entire inner space of the car 5 (see fig. 4). By the control of the sound field control section 21a, an acoustic signal based on the acoustic content is radiated in the sound field 27. The output unit 21b transmits the drive signal and reproduction data of the acoustic content to the speaker box 20 under the control of the sound field control unit 21 a. The storage unit 21c stores one or more audio contents in advance. The storage unit 21c also stores the calculation result of the sound field control unit 21a, various data and programs used for controlling the sound field control unit 21a, and the like.

The detection unit 21d detects physical quantities indicating the traveling state and the stopping state of the car 5 of the elevator 1. The physical quantity is, for example, a traveling speed of the car 5, an acceleration of the car 5, vibration of the car 5, or an air pressure received by the car 5. The detection unit 21d sends the detected physical quantity to the sound field control unit 21a. The sound field control unit 21a increases or decreases the sound pressure level of the radiation sound content according to the received physical quantity. Specifically, the sound field control unit 21a gradually increases the sound pressure level when the car 5 starts traveling and performs acceleration traveling, and gradually decreases the sound pressure level when the car 5 approaches the stop floor and performs deceleration traveling. Here, sound pressure level means sound volume. If the sound pressure level is large, the sound volume is large, and if the sound pressure level is small, the sound volume is small. Details of the operation of the sound field control unit 21a and the detection unit 21d will be described later. The timer unit 21e counts the current date and time. The timer unit 21e has month and day data and time data in an almanac. The sound field control unit 21a may acquire date and time data indicating the current date and time from the timer unit 21e, and may switch the sound content according to the season and the living time period based on the date and time data.

The sound content is generated by, for example, the sound content generating device 40 provided outside, and stored in the storage unit 21c of the sound field control device 21 in advance. Alternatively, the audio content may be commercially available music stored in a CD (compact disc), DVD (Digital Versatile Disk: digital versatile disc), USB (Universal Serial Bus: universal serial bus) memory, or the like. In this case, the sound field control device 21 has an optical drive such as a CD drive or a USB connector as necessary. As described above, the audio content according to embodiment 1 includes audio content generated by the dedicated audio content generating device 40, general commercially available music, and the like. The audio content means data obtained by storing various forms of "sounds" in an arbitrary format.

When the acoustic content generating apparatus 40 generates acoustic content, for example, sound from a plurality of sound sources generated in nature is combined to generate acoustic content. The acoustic content generating apparatus 40 has a signal processing unit 40b, and the signal processing unit 40b performs signal processing on acoustic content. If necessary, the signal processing unit 40b performs one or more signal processing when generating acoustic content by combining sounds from a plurality of sound sources generated in nature. The timing of the signal processing may be before or after the sound is combined. That is, the signal processing may be performed after the sound from the plurality of sound sources is combined, or conversely, the signal-processed sound may be combined after the sound from the plurality of sound sources is subjected to the signal processing. The signal processing includes a plurality of processes such as adjustment of sound pressure level and phase control processing. The phase control processing includes a sound image (pan) processing, a stereo widening processing, and the like. The audio content generating apparatus 40 further includes an output unit 40a, a storage unit 40c, and an input unit 40d. The input unit 40d receives input of sound data from a sound source generated in nature. The sound data may be created based on data actually recorded in nature, but may be artificial data created manually. The output unit 40a outputs the generated audio content. The storage unit 40c stores the calculation result of the signal processing unit 40b, various data and programs used for controlling the signal processing unit 40b, and the like.

The acoustic content using natural sounds may be configured so that, for example, a person living in japan can feel, from the sounds, a season such as spring, summer, autumn, winter, etc., and a living time period such as dawn, daytime, evening, night, etc., who can feel the sounds. Thus, even if the user uses the space in the car 5 in which the external environment is not visible, the user can obtain the feeling of the time zone and the feeling of the season from the "sound". In addition, the acoustic content is structured so as not to feel audible discomfort by excluding uncomfortable factors such as noise and the like. Specifically, the acoustic content is composed of a composite combination of a sound source type, a time zone, and a frequency band of wind sounds, river sounds, bird sounds, and the like that occur naturally in nature.

An example of the audio content will be described in more detail with reference to fig. 3. As described above, the storage unit 21c may store a plurality of audio contents for each season and each life time period. Fig. 3 is a diagram showing an example of an additional sound inserted into audio content for each season and each life time period. As shown in fig. 3, the type of living organism used for the additional sound is changed for each season and each living time zone. In this case, the background sound to be played in the audio content is, for example, a sound of a tree that is rocked by wind, a sound of a river or a water flow in the sea, or the like. The storage unit 21c stores a plurality of audio contents generated by adding the additional sound shown in fig. 3 to these background sounds in advance.

Therefore, in this case, at least (4 seasons) × (4 life time periods) =16 pieces of sound content are created and stored in the storage section 21 c. The sound field control unit 21a acquires date and time data indicating the current date and time from the timer unit 21e, selects sound contents corresponding to the actual season and life time period based on the date and time data, and switches the sound contents to be reproduced. In the case where the audio content is music, at least (4 seasons) × (4 life time periods) =16 pieces of music may be stored in the storage unit 21c in advance. In this case, the sound field control unit 21a may acquire date and time data indicating the current date and time from the timer unit 21e, select the audio content of music corresponding to the actual season and life time, and switch the audio content to be reproduced.

In embodiment 1, a plurality of audio contents may be prepared in advance for each season and each living time zone, and the audio contents may be switched according to the actual season and living time zone. In this case, the user is not given a feeling of uniformity, and the user can feel season transitions, life time period changes, and the like audibly, and the user is highly likely to feel "healing" and "relaxing". In addition, depending on the user, it is possible to obtain a sense of a cheerful jump by recognizing the switching of the sound content, thereby making the car 5 of the riding elevator 1a fun. In this way, by switching the audio content, the pressure of the user can be further reduced.

The hardware configuration of the car control device 9 will be described. The functions of the input unit 9a, the control unit 9b, and the output unit 9c in the car control device 9 are realized by a processing circuit. The processing circuitry is comprised of dedicated hardware or processors. Dedicated hardware is, for example, ASIC (Application Specific Integrated Circuit: application specific integrated circuit), FPGA (Field Programmable Gate Array: field programmable gate array), etc. The processor executes a program stored in the memory. The storage unit 9d is constituted by a memory. The Memory is a nonvolatile or volatile semiconductor Memory such as RAM (Random Access Memory: random access Memory), ROM (Read Only Memory), flash Memory, EPROM (Erasable Programmable Read Only Memory: erasable programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory: electrically erasable programmable Read Only Memory), or a disk such as a magnetic disk, a floppy disk, and an optical disk.

The hardware configuration of the audio content generating apparatus 40 will be described. The functions of the output unit 40a, the signal processing unit 40b, and the input unit 40d in the audio content generating apparatus 40 are realized by a processing circuit. The processing circuitry is comprised of dedicated hardware or processors. The dedicated hardware and processor may be the same as those described above, and thus description thereof is omitted. The storage unit 40c is constituted by a memory. The memory may be the same as that described above, and thus an explanation is omitted.

The hardware configuration of the sound field control device 21 will be described. The functions of the sound field control unit 21a, the output unit 21b, and the timer unit 21e in the sound field control device 21 are realized by a processing circuit. The processing circuitry is comprised of dedicated hardware or processors. The dedicated hardware and processor may be the same as those described above, and thus description thereof is omitted. The storage unit 21c is constituted by a memory. The memory may be the same as that described above, and thus an explanation is omitted.

The detection unit 21d of the sound field control device 21 is constituted by a sensor. The sensor includes the following sensors.

Acceleration sensor capable of detecting acceleration in one direction or more.

A speed sensor capable of speed detection.

An air pressure sensor capable of detecting air pressure changes.

The constituent materials of the sensors are not particularly limited, and any of electronic type, piezoelectric type, thermoelectric type, and the like may be used as the induction type.

The detection unit 21d detects a physical quantity indicating the traveling state of the car 5 of the elevator 1. The physical quantity includes acceleration or speed in the traveling direction of the car 5, vibration of the car 5, or a change in air pressure received by the car 5 when the car 5 is raised or lowered, or the like. In embodiment 1, a case where the detection unit 21d is constituted by an acceleration sensor will be described as an example. The sound field control unit 21a can determine the traveling state of the car 5 of the elevator 1 based on the physical quantity detected by the detection unit 21 d. The traveling state also includes a stop state in which the car 5 is stopping.

Fig. 4 is a front view showing the configuration of the acoustic system 13 according to embodiment 1. Fig. 5 is a plan view showing the arrangement of speaker box 20 of sound system 13 according to embodiment 1. In fig. 4 and 5, the height direction of the car 5 is defined as the Y direction, the width direction of the car 5 is defined as the X direction, and the depth direction of the car 5 is defined as the Z direction. The Y direction is, for example, a vertical direction. As shown in fig. 5, when defining the left and right directions in the car 5, the X direction is the left and right direction of the car 5, and the Z direction is the front and rear direction of the car 5.

As shown in fig. 4, the sound system 13 is composed of a speaker system 22 and a sound field control device 21, which are disposed on the ceiling of the space in the car 5. As shown in fig. 4, each speaker box 20 is provided in an internal space of the suspended ceiling 10, for example. Speaker system 22 includes more than one speaker cabinet 20. Each speaker box 20 is mounted with one or more speaker units 23. The sound system 13 forms a sound field 27 for the user of the car 5, and emits sound. In embodiment 1, the speaker system 22 performs mono reproduction or stereo reproduction, and creates a sound field environment in the space inside the car 5. This can bring "comfort" to the hearing sensation of the user located in the inner space of the car 5. As a result, uncomfortable factors such as pressure when staying in a narrow space can be reduced.

In addition, in the case of monaural reproduction, it is preferable to use two or more speaker units 23 so that a stereoscopic sound field environment can be generated. When reproducing a monaural signal by two or more speaker units 23, at least one of the following two signal processes is performed on the sound signal on at least one channel side.

(1) Frequency filtering is performed to process the audio signal in a frequency band of at least 1/3 octave, particularly in a frequency band of at least 800 Hz.

(2) The phase of the entire frequency band or any frequency band of the audio signal is shifted between 0 DEG and 180 DEG.

Then, by simultaneously radiating the signal-processed sound signal and the non-signal-processed sound signal from the two or more speaker units 23, it is possible to provide the user with a wide sense of sound field.

In embodiment 1, as shown in fig. 4 and 5, a case where the number of speaker boxes 20 included in the speaker system 22 is two will be described as an example. However, the number of speaker boxes 20 is not limited thereto, and may be any number of one or more. In the case where the number of speaker boxes 20 is 1, the number of speaker units 23 mounted on the speaker boxes 20 is preferably two or more, but may be 1. When the number of speaker boxes 20 is two or more or the number of speaker units 23 is two or more, sound emission from a plurality of directions can be realized in the space inside the car 5, and a binaural reproduction or more sound field 27 can be formed.

Fig. 6 is a side view showing an example of the structure of speaker box 20 according to embodiment 1. Fig. 7 is a front view showing the structure of the speaker box 20 of fig. 6. As shown in fig. 6 and 7, the speaker box 20 is constituted by a speaker unit 23 and a housing 25. The speaker unit 23 is housed in a case 25. The speaker unit 23 has a radiation surface 23a, and the radiation surface 23a is provided on the front surface 25a of the housing 25 to radiate sound to the outside. The case 25 has, for example, a rectangular parallelepiped shape. The housing 25 is a closed device having a hollow interior. The radiation surface 23a of the speaker unit 23 is fitted into an installation hole provided in the front surface 25a of the housing 25, and is exposed to the outside from the installation hole. The other portions of the speaker unit 23 are all disposed in the housing 25. Therefore, the sound from the radiation surface 23a of the speaker unit 23 is radiated only in the arrow a direction of fig. 6, and is not radiated to the outside through other portions of the housing 25 than the radiation surface 23 a.

Fig. 8 is a side view showing a configuration of a modification of speaker box 20 according to embodiment 1. Fig. 9 is a front view showing the structure of the speaker box 20 of fig. 8. As shown in fig. 8 and 9, the speaker box 20 may house two or more speaker units 23 in the case 25. In this case, two or more speaker units 23 may be all the same type of speaker unit, but may be different types of speaker units. Specifically, for example, one speaker unit 23-1 may be a full-range speaker, and the other speaker unit 23-2 may be a tweeter. The full-frequency speaker means a speaker that reproduces low to high frequencies using one speaker. In the embodiment of the present invention, when one speaker unit 23 is housed in the case 25 of the speaker box 20, the speaker unit 23 is assumed to be a full-band speaker. In addition, the tweeter is a speaker dedicated to a low frequency, which is used as an assist of the full-frequency speaker. It is assumed that it is difficult to reproduce low to high frequencies with one speaker, resulting in a case where sound quality is not ideal. In such a case, a tweeter is used to compensate for this. The two or more speaker units 23 disposed in the housing 25 may be different types of speaker units, or may be the same type of speaker unit. Here, it is preferable to provide one speaker as a full-frequency speaker, and the other speaker as a speaker dedicated to a low frequency or dedicated to a high frequency, which is used as an assist of the full-frequency speaker. In this case, a wide frequency band from low frequency to high frequency can be handled, and sound emission for each minute frequency band can be performed. In this way, when one speaker box 20 has a plurality of speaker units 23, the speaker box 20 alone can be used to improve the sound quality and expand the reproduction band. As a result, a "high sound quality system" that can cover a wide frequency band can be easily obtained.

Indirect Sound emission

Returning to the description of fig. 4 and 5. As shown in fig. 4 and 5, the speaker box 20 is disposed in the internal space of the suspended ceiling 10. The height of the suspended ceiling 10 in the Y direction (the height direction of the car 5) is, for example, about 5 cm. Therefore, as shown in fig. 4, the height H1 of the housing 25 of the speaker box 20 in the Y direction (the height direction of the car 5) is 5cm or less. In this way, the height H1 of the housing 25 is limited by the height of the suspended ceiling 10 in the Y direction (the height direction of the car 5). As shown in fig. 4 and 5, the radiation surface 23a of the speaker unit 23 is disposed so as to face the side plate 5a of the car 5. The radiation surface 23a is disposed along the edge of the side surface 10a of the suspended ceiling 10. As shown in fig. 5, the radiation surface 23a is located in the same plane as the side surface 10a of the suspended ceiling 10. Therefore, the position of the radiation surface 23a in the X direction (the width direction of the car 5) coincides or substantially coincides with the position of the side surface 10a of the suspended ceiling 10 in the X direction. The side surface 10a of the suspended ceiling 10 is provided with an opening corresponding to the position of the radiation surface 23 a. The entire side surface 10a of the suspended ceiling 10 may be opened. Therefore, the sound emitted from the emission surface 23a is not blocked by the side surface 10a of the suspended ceiling 10. As described above, the gap 11 of the 1 st distance D is provided between the side surface 10a of the suspended ceiling 10 and the side plate 5a of the car 5. The 1 st distance D is about 5 cm. The 1 st distance D is appropriately set in the range of 2cm to 20cm, preferably 3cm to 10cm, depending on the type of the elevator 1. As shown in fig. 4 and 5, the sound emitted from the emission surface 23a of the speaker unit 23 is emitted in the direction of arrow a. Then, the sound is reflected by the side plate 5a of the car 5 to become a reflected sound. As shown in fig. 4 and 5, the reflected sound proceeds in the direction of arrow B. As described above, in embodiment 1, the speaker unit 23 uses the reflection of the side plate 5a of the car 5 to perform "indirect sound emission" in which sound emission is performed to the user.

In embodiment 1, the radiation surface 23a of the speaker unit 23 is disposed so as to face the side plate 5a of the car 5 across the gap 11 having the 1 st distance D, and so as to be close to the side plate 5a of the car 5. As described above, the 1 st distance D is, for example, about 5 cm. Therefore, the sound radiated from the radiation surface 23a of the speaker unit 23 is reflected by the side plate 5a of the car 5 before the sound pressure level is reduced and shortly after the radiation.

As shown in fig. 5, the speaker box 20 is disposed at a position on the rear side of the central portion in the Z direction (the depth direction of the car 5) of the suspended ceiling 10. The position of the speaker box 20 in the Z direction is not limited to this, and may be provided at the center of the suspended ceiling 10 in the Z direction, or may be provided at a position on the front side of the center of the suspended ceiling 10 in the Z direction. As shown in fig. 4, the speaker box 20 is disposed at a central portion of the suspended ceiling 10 in the Y direction (the height direction of the car 5). The position of the speaker box 20 in the Y direction is not limited to this, and may be an upper position or a lower position than the central portion of the suspended ceiling 10 in the Y direction.

The speaker unit 23 provided in one speaker box 20 out of the two speaker boxes 20 shown in fig. 5 is referred to as a speaker unit 23R. The speaker unit 23 provided in the speaker box 20 is referred to as a speaker unit 23L. The speaker unit 23R and the speaker unit 23L are configured to be separated from each other. The speaker box 20 accommodating the speaker unit 23R and the speaker box 20 accommodating the speaker unit 23L are disposed apart from each other by a certain distance with respect to the center portion of the suspended ceiling 10 in the X direction. This distance is referred to as distance 2D 2. The 2 nd distance D2 is determined according to the dimension of the car 5 in the X direction, the 1 st distance D, and the dimension of the housing 25 in the X direction. The speaker unit 23R and the speaker unit 23L are disposed with their back surfaces facing each other. Therefore, as shown in fig. 5, the radiation surface 23a of the speaker unit 23R is disposed to face the right side plate 5a of the car 5. On the other hand, the radiation surface 23a of the speaker unit 23L is disposed so as to face the left side plate 5a of the car 5. The radiation surfaces 23a of the speaker units 23R and 23L are disposed facing the space 11, respectively. The radiation surfaces 23a of the speaker units 23R and 23L are disposed in the same plane as the left and right side surfaces 10a of the suspended ceiling 10.

In the car 5 of the elevator 1, the user stands generally in the direction of the car door 5 d. Therefore, the sound emitted from the speaker unit 23R mainly reaches the right ear of the user, and the sound emitted from the speaker unit 23L mainly reaches the left ear of the user. In the following, the sound emitted from the speaker unit 23R is referred to as "right sound", and the sound emitted from the speaker unit 23L is referred to as "left sound".

[ direct Sound emission ]

The installation direction of the speaker box 20 is not limited to the case of fig. 4 and 5. Fig. 10 is a front view schematically showing a configuration of a modification of the acoustic system 13 of embodiment 1.

In fig. 10, two speaker units 23R-1 and 23L-1 are provided opposite to the floor 5b of the car 5. Therefore, as shown in fig. 10, the radiation surfaces 23a of the speaker units 23R-1 and 23L-1 are disposed so as to face the floor 5b of the car 5. The speaker box 20 accommodating the speaker unit 23R-1 and the speaker box 20 accommodating the speaker unit 23L are disposed apart from each other by a predetermined distance with respect to the center portion of the suspended ceiling 10 in the X direction. This prescribed distance is referred to as a 3 rd distance D3. The 3 rd distance D3 may be the same as the 2 nd distance D2 shown in fig. 5 or may be different from the 2 nd distance D2 shown in fig. 5.

As shown in fig. 10, the radiation surfaces 23a of the speaker units 23R-1 and 23L-1 are arranged in the same plane as the lower surface 10b of the suspended ceiling 10. Therefore, the position of each radiation surface 23a in the Y direction (the height direction of the car 5) coincides or substantially coincides with the position of the lower surface 10b of the suspended ceiling 10 in the Y direction. The radiation surface 23a of the speaker units 23R-1 and 23L-1 is partially fitted into a mounting hole provided in the lower surface 10b of the suspended ceiling 10. The radiation surfaces 23a of the speaker units 23R-1 and 23L-1 are exposed to the outside from the mounting holes, respectively. Therefore, the sound emitted from the emission surface 23a of each of the speaker units 23R-1 and 23L-1 is not blocked by the lower surface 10b of the suspended ceiling 10.

As shown in fig. 10, the sound emitted from the speaker units 23R-1 and 23L-1 is emitted from the emission surface 23a in the arrow a direction. Thus, the speaker units 23R-1 and 23L-1 perform "direct sound emission" in which sound emission is directly performed from the suspended ceiling 10 to the user.

[ combination of indirect and direct Acoustic emission ]

Fig. 11 is a plan view schematically showing a configuration of another modification of the acoustic system 13 according to embodiment 1. Fig. 11 shows a state in which the lower surface 10b of the suspended ceiling 10 is viewed from the floor 5b side. In FIG. 11, 4 speaker units 23R-1, 23R-2, 23L-1, 23L-2 are provided. In fig. 11, two speaker units 23R-2 and 23L-2 out of 4 speaker units 23R-1, 23R-2, 23L-1, 23L-2 are provided opposite to the side plate 5a on the front side of the car 5. The other two speaker units 23R-1 and 23L-1 are disposed opposite to the floor 5b of the car 5. Therefore, as shown in fig. 10, the radiation surfaces 23a of the speaker units 23R-1 and 23L-1 are disposed so as to face the floor 5b of the car 5.

Described in more detail. As shown in fig. 11, the two speaker units 23R-2 and 23L-2 on the front side are disposed opposite to the side plate 5a on the front side of the car 5. The speaker box 20 accommodating the speaker unit 23R-2 and the speaker box 20 accommodating the speaker unit 23L-2 are disposed with a certain distance from each other with respect to the center portion of the suspended ceiling 10 in the X direction. This certain distance may be the same as the 3 rd distance D3 shown in fig. 10, or may be different from the 3 rd distance D3 shown in fig. 10.

Accordingly, the radiation surfaces 23a of the speaker units 23R-2 and 23L-2 are disposed so as to face the side plate 5a of the car 5, respectively. The radiation surfaces 23a are arranged along the side of the side surface 10a of the suspended ceiling 10. Therefore, the position of each radiation surface 23a in the Z direction (the depth direction of the car 5) coincides or substantially coincides with the position of the side surface 10a of the suspended ceiling 10 in the Z direction.

As described above, the gap 11 of the 1 st distance D is provided between the side surface 10a of the suspended ceiling 10 and the side plate 5a of the car 5. As shown in fig. 11, the sound emitted from the speaker units 23R-2 and 23L-2 is emitted from the emission surface 23a in the arrow a direction. Then, the sound is reflected by the side plate 5a of the car 5 to become a reflected sound. As shown in fig. 11, the reflected sound proceeds in the direction of arrow B. In this way, the speaker units 23R-2 and 23L-2 perform "indirect sound emission" of sound emission from the suspended ceiling 10 to the user by reflection from the side plate 5a of the car 5.

On the other hand, the two speaker units 23R-1 and 23L-1 on the rear side are provided so as to face the floor 5b of the car 5 as described above with reference to fig. 10. Therefore, as described above, the two speaker units 23R-1 and 23L-1 on the rear side perform "direct sound emission" in which sound emission is directly performed from the suspended ceiling 10 to the user. In embodiment 1, as in the modification of fig. 11, the "indirect sound emission" and the "direct sound emission" may be mixed. In addition, in this case, in fig. 11, speaker units 23R and 23L shown in fig. 5 may be provided instead of the speaker units 23R-2 and 23L-2.

The speaker unit 23 may be provided at any place on the lower surface 10b of the suspended ceiling 10 in the car 5. As the installation mode, there are, for example, a case of being arranged on the right and left sides as shown in fig. 5, a case of being arranged on the front and rear sides, a case of being arranged on 2 corners among 4 corners of the lower surface 10b of the suspended ceiling 10, and the like, and combinations of these cases are also free. However, when the speaker units 23 are separated from each other to some extent, sound quality is improved. Therefore, in embodiment 1, the speaker boxes 20 accommodating the speaker units 23 are arranged apart from each other by the 2 nd distance D2 or the 3 rd distance D3.

[ height of speaker box)

There may be a case where the speaker box 20 is provided in the floor 5b of the car 5. However, since the body itself of the user becomes a sound absorbing body and a reflecting body, if the number of users increases, it is difficult for acoustic signals emitted from the feet of the users to reach the positions of the ears of the users. As a result, the sound field 27 based on sound reproduction with high sound quality cannot be created in the car 5. In this way, in embodiment 1, in order to realize high-quality reproduction, the speaker box 20 is provided at a position above the chest of the user as a basic principle.

[ Sound field ]

The sound field 27 generated by the sound system 13 is, for example, a range shown by a broken line in fig. 4. Specifically, the height H2 of the lower limit 27a of the sound field 27 is, for example, about 1.0m to 1.7m, preferably about 1.6m, from the floor 5b of the car 5. The upper limit height of the sound field 27 is, for example, 1.8m from the floor 5b of the car 5. Thus, the sound field 27 is preferably formed in a range of 1.6m to 1.8m in height from the floor 5 b. In this way, in the car 5, the sound field 27 is generated in a portion above the lower limit 27 a. As a result, as shown in fig. 4, the sound field 27 is formed around the head of the user. The height H2 of the lower limit 27a of the sound field 27 is set according to the average height of the user (except for middle school students). In addition, as described above, when a plurality of users are seated in the car 5, sound is blocked or absorbed by the body of the users in a range of 0m to less than 1.6m from the floor 5b, and thus a good sound field cannot be formed. Further, in a range where the height from the floor 5b exceeds 1.8m, since the sound field 27 is formed biased on the head of the user, it is felt to be acoustically inaudible to the user.

[ detection section of Sound field control device ]

Next, the detection unit 21d provided in the sound field control apparatus 21 will be described with reference to fig. 12 to 15. Fig. 12 is a front view showing the arrangement position of the detection portion 21 d. Fig. 13 is a plan view showing the arrangement position of the detection unit 21 d. In fig. 13, a part of the structure is shown in perspective for the sake of explanation. Fig. 14 is a perspective view showing the structure of the detection unit 21 d. Fig. 15 is a diagram showing an example of waveforms of detection results of the detection unit 21d in different directions. In fig. 15, the horizontal axis represents time, and the vertical axis represents the output level of the detection result of the detection unit 21 d.

As described above, the detection unit 21d detects the physical quantity indicating the traveling state and the parking state of the car 5, and is constituted by at least one of an acceleration sensor, a speed sensor, and an air pressure sensor, for example. In embodiment 1, a case where the detection unit 21d is constituted by an acceleration sensor will be described. The acceleration sensor detects vibrations in 1 direction or 3 directions. The acceleration sensor measures acceleration of an object, and thereby can detect the degree of movement, inclination, vibration, and the like of the object. The acceleration sensor is different from the vibration sensor, and can detect gravity. The acceleration sensor measures acceleration and performs signal processing on the acceleration to obtain various information such as movement, inclination, vibration, and impact of an object. The acceleration sensor has the concept of an "axis", and for example, a 3-axis acceleration sensor can obtain information of an X axis, a Y axis, and a Z axis. For example, when the Z axis is fixed and the object is tilted, the output that changes at this time is the output of the X axis and the Y axis. In addition, the acceleration sensor can also detect the air pressure to which the object is subjected. The principle of the acceleration sensor for detecting the air pressure will be described later. In embodiment 1, a case will be described in which an acceleration sensor measures acceleration that changes with traveling of the car 5, and vibration of the car 5 and a change in air pressure received by the car 5 are detected from the acceleration.

As shown in fig. 12, the detection unit 21d is mounted on the car 5, and detects vibration in the traveling direction of the car 5 and changes in air pressure. The detection unit 21d is mounted on, for example, the upper surface of the ceiling plate 5c of the car 5. In this case, the detection portion 21d is provided on the outer surface of the car 5. The detection unit 21d may be provided inside the casing 210 of the sound field control apparatus 21 shown in fig. 4, but may be provided outside the casing 210 of the sound field control apparatus 21. In order to reduce the detection error, it is preferable that the detection unit 21d is provided in a central portion of the ceiling plate 5c of the car 5 in a plan view, as shown in fig. 13. The detection unit 21d may be provided at a location other than the installation location shown in fig. 12 and 13. For example, as shown by a broken line 21dA in fig. 12, the floor 5b of the car 5 may be embedded. Alternatively, as shown by a broken line 21dB in fig. 12, the motor may be provided in the car operating panel 5f of the car 5. Alternatively, as shown by a broken line 21dC in fig. 12, the ceiling may be provided in the inner space of the suspended ceiling 10 of the car 5. In these cases, the detection unit 21d is provided inside the car 5. In this way, the detection portion 21d is provided on the outer surface or inside the car 5. The detection unit 21d is provided near the ceiling plate 5c, in the floor 5b, or in the car operating panel 5f of the elevator 1, at a location which is not found by the user and which is not touched by the user's hand. This can prevent the user from making a miscreant or the like on the detection unit 21 d.

As shown in fig. 14, the detection unit 21d is configured by a substrate 212 and a sensor element 211 fixed to the substrate 212. The sensor element 211 can detect accelerations in the 3 directions of the X direction, the Y direction, and the Z direction shown in fig. 14. The sensor element 211 is formed, for example, by a MEMS (Micro Electro Mechanical Systems: microelectromechanical system) sensor element. MEMS sensor elements are very small acceleration sensors that are also used in smartphones, gaming machines, etc. The sensing method of the sensor element 211 may be any method such as an electronic method, a piezoelectric method, and a pyroelectric method.

The sensor element 211 detects vibrations in the 3 directions of the X direction, the Y direction, and the Z direction. As shown in the graph of fig. 15, the sensor element 211 outputs acceleration signals in different directions according to vibrations in the X direction, the Y direction, and the Z direction. At this time, as shown in fig. 12, the detection portion 21d is provided so that the upper surface of the base plate 212 and the upper surface of the ceiling plate 5c of the car 5 are parallel to each other. In this case, the traveling direction of the car 5 coincides with the Y direction of the detection unit 21d. Therefore, as shown in fig. 15, a significant change is observed in the waveform of the acceleration signal in the Y direction. However, little change is observed in the waveforms of the acceleration signals in the X direction and the Z direction. In embodiment 1, a case will be described in which the sound field control unit 21a determines the traveling state and the parking state of the car 5 using the detection result in the Y direction of the detection unit 21d in which a significant change occurs in the waveform.

Further, an amplifier may be provided between the detection unit 21d and the sound field control unit 21a as needed. When the output level of the acceleration signal outputted from the detection unit 21d is too low, the output level of the acceleration signal is increased by an amplifier to be an output level that is easy to be handled by the sound field control unit 21 a. Conversely, when the output level of the acceleration signal outputted from the detection unit 21d is too high, the output level of the acceleration signal is reduced by the amplifier to be an output level that is easily handled by the sound field control unit 21 a.

The detection unit 21d is configured to be capable of setting the substrate 212 to an arbitrary orientation. Therefore, the direction in which the change is observed in the waveform of the acceleration signal is different depending on the orientation of the setting substrate 212. That is, as described above, if the traveling direction of the car 5 coincides with the Y direction of the detection portion 21d, a significant change can be observed in the waveform of the acceleration signal in the Y direction. On the other hand, if the traveling direction of the car 5 coincides with the X direction of the detection portion 21d, a significant change can be observed in the waveform of the acceleration signal in the X direction. Also, if the traveling direction of the car 5 coincides with the Z direction of the detection portion 21d, a significant change can be observed in the waveform of the acceleration signal in the Z direction. Therefore, the sound field control unit 21a may determine the traveling state and the parking state of the car 5 by using the detection result in the direction in which a significant change is observed in the waveform of the acceleration signal, out of the detection results of the detection unit 21 d.

As shown in fig. 1, the car 5 is suspended by means of the main ropes 4. Therefore, a case can be assumed in which vibrations are generated transiently when the user intentionally makes noise in the car 5. Therefore, as shown in fig. 15, a threshold value is set in advance for the output level of the detection section 21 d. In the following, this threshold is referred to as a 1 st threshold Th1. The sound field control section 21a excludes the detection result exceeding the 1 st threshold Th1 from the time series detection result of the detection section 21d as an abnormal value. Then, the sound field control unit 21a determines the traveling state and the stop state of the car 5 using the detection result excluding the abnormal value. This can prevent the sound field control unit 21a from making an erroneous determination when determining the traveling state and the stop state of the car 5.

In fig. 15, for simplification of the drawing, the 1 st threshold Th1 is set only for the acceleration signal in the Y direction, but in practice, the 1 st threshold Th1 is preferably set in advance for the acceleration signals in the X direction and the Z direction.

In the above description, the case where the sensor element 211 detects vibrations in three directions is described as an example, but the sensor element 211 may detect vibrations in one direction, that is, only vibrations in the traveling direction of the car 5.

Next, the operation of the detection unit 21d associated with the running and stopping of the car 5 will be described with reference to fig. 16 to 18. Fig. 16 is a diagram showing waveforms of outputs of the detection unit 21d used for the determination by the sound field control unit 21 a.

Fig. 16 shows waveforms of detection results in the Y direction during operation of the car 5. Fig. 17 is a diagram showing a relationship between the output of the detection unit 21d and the traveling speed of the car 5. More specifically, fig. 17 (a) is an enlarged view showing a portion P in fig. 16, and fig. 17 (b) is a graph showing the traveling speed of the car 5 of the elevator 1 corresponding to fig. 17 (a). The waveform of fig. 17 (a) is obtained by smoothing the waveform of fig. 16 so as to smooth the waveform. The smoothing process is, for example, a time-averaging process. Fig. 18 is a diagram showing a change in state of the diaphragm 211a of the sensor element 211 provided in the detection unit 21d when the car 5 is lifted.

Before the description of fig. 16 and 17, the operation of the diaphragm 211a provided in the sensor element 211 will be described with reference to fig. 18. Fig. 18 shows the diaphragm 211a when the car 5 is lifted. As shown in fig. 18, in the case where the sensor element 211 of the detection portion 21d is constituted by a piezoelectric element, the sensor element 211 includes a diaphragm 211a, a support portion 211b, and an exterior case 211c. The support portion 211b has a rectangular frame shape, and a central portion thereof is formed in a circular hollow. The outer periphery of the rectangular frame of the support portion 211b is fixed to the outer case 211c. A circular diaphragm 211a is stretched at a central portion of the support portion 211 b. The support portion 211b supports the outer periphery of the diaphragm 211a. The diaphragm 211a is deformed by the vibration of the car 5 and the change in the air pressure to which the car 5 is subjected. As shown in fig. 18 (a), when the car 5 is stopped, the air pressure is not applied to the diaphragm 211a, and therefore the diaphragm 211a is in a flat state. On the other hand, when the car 5 starts to ascend and runs at an acceleration, as shown in the period from time t1 to time t2 in fig. 17 (b), the speed of the car 5 increases. At this time, as shown in fig. 18 (b), air pressure in the upward direction along with the ascent of the car 5 is applied to the diaphragm 211a. Thereby, the diaphragm 211a is deformed into an arc shape protruding in the upward direction. A voltage is generated in association with the deformation of the diaphragm 211a. Here, the voltage is set to a voltage in the +direction.

Then, the car 5 stops the acceleration running, and runs at a constant speed as shown in the period from time t2 to time t3 in fig. 17 (b). In the following, running at a constant speed is referred to as constant speed running. When the car 5 runs at a constant speed, the air pressure applied to the diaphragm 211a is stabilized, and the vibration of the car 5 is reduced. Therefore, as shown in fig. 18 (c), the change of the diaphragm 211a is reduced, and the diaphragm 211a returns to a substantially flat state. Then, as shown in the period from time t3 to time t4 in fig. 17 (b), when the car 5 approaches the stop floor, the car 5 performs deceleration traveling in preparation for stopping. At this time, as shown in fig. 18 (d), the air pressure applied to the diaphragm 211a becomes a "negative pressure" state, and the air pressure in the lower direction is applied, contrary to the acceleration running in fig. 18 (b), due to the abrupt speed change of the car 5. As a result, as shown in fig. 18 (d), the diaphragm 211a is deformed into an arc shape protruding downward. A voltage is generated in association with the deformation of the diaphragm 211 a. Here, the voltage is set to a voltage in the-direction (counter electromotive force).

In this way, the diaphragm 211a deforms in association with the running or stopping of the car 5, and the detection unit 21d outputs the voltage in the +direction or the voltage in the-direction. The voltage is a physical quantity indicating the traveling state and the stopping state of the car 5, and indicates the vibration of the car 5 and the change in the air pressure to which the car 5 is subjected. In this way, when the detecting unit 21d is an acceleration sensor, the detecting unit 21d detects the vibration of the car 5 and the change in the air pressure received by the car 5.

Next, the traveling state and the parking state of the car 5 will be described with reference to fig. 16 and 17. First, in fig. 16, the horizontal axis represents time, and the vertical axis represents the +direction voltage and the-direction voltage outputted from the detection unit 21 d. In fig. 16, in each of the time divisions (1) to (7), the car 5 is in the following state.

(1): the car 5 is stopping.

(2): the car 5 is traveling in an upward direction. That is, the car 5 is rising in the hoistway 2.

(3): the car 5 is stopping.

(4): the car 5 is traveling in a downward direction. That is, the car 5 is descending in the hoistway 2.

(5): the car 5 is stopping.

(6): the car 5 is traveling in an upward direction. That is, the car 5 is rising in the hoistway 2.

(7): the car 5 is stopping.

Fig. 17 (a) shows a portion P of fig. 16. That is, fig. 17 (a) shows the time division (6) of fig. 16. In fig. 17 (a), the horizontal axis represents time, and the vertical axis represents the +direction voltage and the-direction voltage outputted from the detection unit 21 d. As shown in fig. 17 (a), the time division (6) of fig. 16 is further subdivided into the following time divisions (U1) to (U5). In each of the time divisions (U1) to (U5) of fig. 17 (a), the acceleration and jerk of the car 5 are in the following states. Jerk is the time rate of change of acceleration.

(U1): acceleration > 0, jerk > 0

(U2): acceleration is more than 0, jerk is less than 0

(U3): acceleration is 0 or about 0 and jerk is 0

(U4): acceleration is less than 0, jerk is less than 0

(U5): acceleration is less than 0, jerk is more than 0

That is, in the time divisions (U1) and (U2), the detection unit 21d outputs the voltage in the +direction as shown in fig. 17 in a state where the car 5 is traveling with acceleration. In the time division (U3), the voltage value output by the detection unit 21d is 0 or substantially 0 in the state where the car 5 is traveling at a constant speed. In the time divisions (U4) and (U5), the detection unit 21d outputs a voltage in the direction of the car 5 while the car is traveling at a reduced speed.

The sound field control unit 21a determines the traveling state of the car 5 based on the output of the detection unit 21 d. Specifically, when the detection unit 21d outputs a voltage in the +direction during the ascent of the car 5, the sound field control unit 21a determines that the car 5 is in an acceleration state. When the voltage value output from the detection unit 21d becomes 0 or substantially 0 after the state of the voltage in the +direction, the sound field control unit 21a determines that the car 5 is in a constant speed state. When the detection unit 21d outputs a voltage in the direction during the ascent of the car 5, the sound field control unit 21a determines that the car 5 is in a decelerating state. When the voltage value output from the detection unit 21d becomes 0 or substantially 0 after the state of the voltage in the-direction, the sound field control unit 21a determines that the car 5 is in the stopped state.

Next, a series of operations when the car 5 is lifted will be described with reference to fig. 18 to 20. Fig. 19 is a diagram showing waveforms of output voltages when acceleration of the car 5 at the time of ascent is detected by the detection unit 21 d. In fig. 19, the horizontal axis represents time, and the vertical axis represents the output voltage of the detection unit 21 d. Fig. 20 is a diagram showing a change in sound pressure level of sound content when the car 5 is lifted. More specifically, fig. 20 (a) shows a change in sound pressure level of the sound content when the car 5 is lifted, and the horizontal axis shows time and the vertical axis shows sound pressure level of the sound content. Fig. 20 (b) is the same as fig. 19.

As described above, when the sensor element 211 of the detection unit 21d is configured by a piezoelectric element, the diaphragm 211a changes to an arc shape due to the piezoelectric change, and the output voltage of the sensor element 211 changes in accordance with the amount of change in the arc (i.e., the amplitude). Accordingly, the voltage output from the detection unit 21d increases and decreases. In this way, the detection unit 21d detects the vibration of the car 5 and the change in the air pressure based on the change in the diaphragm 211a, and outputs the +direction voltage or the-direction voltage as a detection signal.

In fig. 19 and 20, in the time division (ST 1), the car 5 is stopping. At this time, as shown in fig. 18 (a), the diaphragm 211a of the sensor element 211 of the detection unit 21d is in a flat state.

In fig. 19, in the time division (U1), the acceleration of the car 5 gradually increases in proportion to the hoisting speed of the hoisting machine 3 shown in fig. 1, and as shown in fig. 18 (b), the diaphragm 211a gradually protrudes in the upward direction. Along with this deformation of the diaphragm 211a, the value of the output voltage of the detection portion 21d also gradually increases. Therefore, the time division (U1) is "rise time as positive voltage direction" of the output voltage of the detection section 21 d.

In fig. 19, in the time division (U2), the acceleration of the car 5 gradually decreases in proportion to the hoisting speed of the hoisting machine 3 shown in fig. 1, and the protruding amount of the diaphragm 211a also gradually decreases. Along with this deformation of the diaphragm 211a, the value of the output voltage of the detection portion 21d also gradually decreases. Therefore, the time division (U2) is "a falling time in the positive voltage direction" of the output voltage of the detection section 21 d.

In fig. 19 and 20, the total time length of the time divisions (U1) and (U2) is about 5 seconds. With this time, as shown in fig. 20 (a), the sound field control unit 21a of the sound field control device 21 gradually increases the sound pressure level of the sound content radiated into the car 5.

In fig. 19 and 20, in the time division (U3), the car 5 travels at a constant speed, and the acceleration of the car 5 is 0 or substantially 0. With this, as shown in fig. 18 (c), the diaphragm 211a is in a substantially flat state. At this time, the output voltage of the detection unit 21d is 0 or substantially 0.

The time length of the time division (U3) is an arbitrary time length corresponding to the number of floors of the building in which the elevator 1 is installed. In the time division (U3), as shown in fig. 20 (a), the sound field control unit 21a of the sound field control device 21 adjusts the sound pressure level of the sound content emitted into the car 5 to be constant. Hereinafter, a method for setting sound pressure levels in the time division (U3) will be described.

As described with reference to fig. 1, the car 5 of the elevator 1 is installed in the hoistway 2. Since the hoistway forming body forming the periphery of the hoistway 2 is made of a metal plate, the inside of the hoistway 2 is isolated from external sounds. Therefore, the outdoor sound is less likely to be transmitted into the car 5. On the other hand, the hoistway forming body has a car guide rail portion (not shown) that guides the raising and lowering of the car 5. The car guide rail portion extends in the height direction of the hoistway 2. On the other hand, a car guide shoe is provided on the outer surface of the side plate 5a of the car 5. The car guide shoe and the car guide rail portion can engage with each other. Therefore, the lift of the car 5 is guided by the sliding of the car guide shoes with respect to the car guide rail portions. Therefore, during traveling of the car 5, the sound transmitted into the car 5 is a "sliding sound" between the car guide shoe and the car guide rail portion, and a "sliding sound" between the sheave 3a and the main rope 4 shown in fig. 1. The volume of these "sliding sounds" varies according to the installation environment of the car 5. Therefore, after the car 5 is actually installed, the car 5 is run on trial, and the sound volume of the "sliding sound" is measured by the sound volume meter. The sound pressure level of the audio content in the time division (U3) is preferably determined based on the measured volume of the "sliding sound". Specifically, the sound pressure level of the sound content in the time division (U3) is set to a value larger than the volume of the measured "sliding sound". The sound volume meter may be provided in the sound field control device 21 in advance, and the sound pressure level may be automatically determined by the sound field control unit 21a of the sound field control device 21. Alternatively, the sound field control unit 21a may be set with a sound pressure level by a setting operator of the elevator 1 carrying a sound volume meter. In embodiment 1, the sound pressure level of the acoustic content determined for the time division (U3) is set to the maximum value Max (1 st sound pressure level) of the sound pressure level of the acoustic content.

The operations of the time divisions (U1) to (U3) are summarized below. First, as shown in fig. 20 (a), the sound field control unit 21a of the sound field control device 21 performs a "fade-in" process of gradually increasing the sound pressure level of the sound content radiated into the car 5 in time divisions (U1) and (U2). Then, the sound field control section 21a stops the "fade-in" process at the timing when the sound pressure level reaches the maximum value Max. Then, in the time division (U3), the sound field control unit 21a of the sound field control device 21 radiates sound content into the car while maintaining the sound pressure level of the maximum value Max.

In fig. 19, in the time division (U4), the car 5 approaches the stop floor, and the car 5 decelerates. That is, when the car 5 approaches the stop floor, the rotation of the hoisting machine 3 shown in fig. 1 is controlled, and the braking operation is applied to change to the stop state of the car 5 with a relatively strong force. As shown in fig. 18 (d), the diaphragm 211a gradually protrudes downward due to the air pressure change caused by the sudden braking at this time. Along with this deformation of the diaphragm 211a, the value of the output voltage of the detection portion 21d also gradually decreases. Therefore, the time division (U4) is "rise time as negative voltage direction" of the output voltage of the detection section 21 d.

In fig. 19, in the time division (U5), the acceleration of the car 5 gradually increases in proportion to the hoisting speed of the hoisting machine 3 shown in fig. 1, and the protruding amount of the diaphragm 211a also gradually decreases. With this deformation of the diaphragm 211a, the value of the output voltage of the detection unit 21d gradually increases to approach 0. Therefore, the time division (U5) is "a falling time in the negative voltage direction" of the output voltage of the detection section 21 d.

In fig. 19 and 20, the total time length of the time divisions (U4) and (U5) is about 5 seconds. With this time, the sound field control unit 21a of the sound field control device 21 gradually reduces the sound pressure level of the sound content radiated into the car 5.

In fig. 19 and 20, in the time division (ST 2), the car 5 is stopping. At this time, as shown in fig. 18 (a), the diaphragm 211a of the sensor element 211 of the detection portion 21d has been restored to a flat state.

The operations of the time divisions (U4) to (U5) and the time division (ST 2) are summarized below. First, as shown in fig. 20 (a), the sound field control unit 21a of the sound field control device 21 performs a "fade-out" process of gradually reducing the sound pressure level of the sound content radiated into the car 5 in time divisions (U4) and (U5). The sound field control section 21a of the sound field control device 21 stops the "fade-out" process at the timing when the sound pressure level reaches the minimum value Min (sound pressure level 2). Then, in the time division (ST 2), the sound field control unit 21a of the sound field control device 21 radiates sound content into the car while maintaining the sound pressure level of the minimum value Min.

In this way, even while the car 5 is stopping, the sound field control section 21a of the sound field control device 21 performs processing to reduce the sound broadcast played in the car 5 to a sound volume that can be adequately heard by the user without completely attenuating the sound pressure level of the sound content. Therefore, the minimum value Min of the sound pressure level is predetermined according to the volume of the voice broadcast so that the user can sufficiently hear the voice broadcast played in the car 5. The minimum value Min of the sound pressure level may be determined after the car 5 is actually installed in consideration of the installation environment of the car 5, as in the case of the maximum value Max, but may be performed at the manufacturing stage or the shipping stage of the sound field control device 21. The audio broadcast is output from the emergency speaker 5g shown in fig. 2. This voice broadcast notifies the user of what will occur next, for example, when the car door 5d (see fig. 1 and 2) of the car 5 is opened and closed, when the car 5 reaches a stop floor, when an earthquake is detected by an earthquake detector (not shown) provided in the elevator 1, and the like. Although the voice broadcast is sometimes a voice message, it is sometimes an electronic sound such as "dingdong". As an example of the voice message, "layer 5 to layer" can be cited. The door is about to open. ", elevator up. The door is about to close. "," earthquake. Please get off the ladder. "etc.

The reason for setting the minimum value Min will be described here. More than one user is riding in the elevator 1, and the residence time in the car 5 varies according to the user. On the other hand, the sound pressure level of the sound content is alternately subjected to the "fade-in" process and the "fade-out" process along with the traveling and stopping of the car 5, and thus the sound pressure level of the sound content is always raised and lowered. Therefore, when the sound pressure level of the sound content in which the car 5 is stopped is set to 0, the sound content is temporarily not heard by the user having a long stay time each time the car 5 stops at the intermediate floor. As a result, the user repeatedly "does not hear" and "hears" the audio content. Thus, when the time of exposure to hearing and the amount of exposure to hearing change irregularly, the sound variation of the audio content may instead be "unpleasant" for the user. Therefore, in embodiment 1, the minimum value Min of the sound pressure level of the audio content is set. In this way, even when the car 5 is stopping, a certain degree of sound volume of the sound content can be ensured, so that the cause of "unpleasant" for the user is unlikely to exist.

As described above, in embodiment 1, the maximum value Max (1 st sound pressure level) of the sound pressure level of the sound content is set to be larger than the value of the "sliding sound" generated during the running of the car 5. It is preferable that the maximum value Max (1 st sound pressure level) of the sound pressure level of the sound content is set to be equal to or higher than the sound pressure level of the voice broadcast played in the car 5, for example. The minimum value Min (sound pressure level 2) of the sound pressure level of the sound content is set to be smaller than the sound pressure level of the voice broadcast played in the car 5. The minimum value Min (sound pressure level 2) is set to a value greater than 0.

In addition, in a state where there is no user at all, it is not necessary to reproduce the audio content, and therefore, in this case, the sound pressure level of the audio content may be set to 0. The opening/closing time T1 of the car 5 is set in advance. The opening/closing time T1 is, for example, a time required for a series of operations of stopping the car 5 at a stop floor, opening the door, closing the door, and starting the car 5 to travel. The opening and closing time T1 varies depending on the type of the elevator 1, but the standard is 4 seconds to 5 seconds. In addition, when the car 5 is provided with a car operating panel for disabled persons, the opening/closing time T1 is changed to 14 seconds to 15 seconds when the operation is performed by the car operating panel. Thus, the opening/closing time T1 is set in advance. The sound field control unit 21a of the sound field control device 21 counts the elapsed time in the state where the output voltage of the detection unit 21d is 0, and determines that there is no user in the car 5 when the elapsed time exceeds the on/off time T1. In this case, the sound field control unit 21a of the sound field control device 21 sets the sound pressure level of the sound content to 0 or stops reproduction of the sound content. In the following, the opening/closing time T1 is referred to as an unmanned judgment threshold value for judging whether or not an individual is in the car 5. The above-described time for the opening/closing time T1 is merely an example, and is not limited thereto. The unmanned judgment threshold may be determined based on the on-off time T1, but may be set to 1 minute, 3 minutes, 5 minutes, or the like, for example, and may be determined appropriately within a range of 4 seconds to 10 minutes in view of convenience.

Next, a series of operations when the car 5 is lowered will be described with reference to fig. 21 to 23. The waveform of the output voltage of the detecting unit 21d when the car 5 is descending is opposite to the waveform when the car 5 is ascending.

Before the description of fig. 22 and 23, the operation of the diaphragm 211a of the sensor element 211 will be described with reference to fig. 21. Fig. 21 is a diagram showing a situation of the diaphragm 211a when the car 5 is lowered. As shown in fig. 21 (a), when the sensor element 211 of the detection unit 21d is constituted by a piezoelectric element, the air pressure is not applied to the diaphragm 211a when the car 5 is stopped, and therefore the diaphragm 211a is in a flat state. On the other hand, as shown in fig. 21 (b), when the car 5 starts to descend and runs with acceleration, the air pressure in the downward direction accompanying the descent of the car 5 is applied to the diaphragm 211 a. Thereby, the diaphragm 211a is deformed into an arc shape protruding downward. A voltage is generated in association with the deformation of the diaphragm 211 a. Here, the voltage is set to be a voltage in the-direction. Since the voltage in the negative direction is output from the detection unit 21d in this way, the acceleration running when the car 5 is lowered can be said to be the acceleration running in the negative direction.

Then, the acceleration of the car 5 is stopped, and the car is in a state of traveling at a constant speed. When the car 5 runs at a constant speed, the air pressure applied to the diaphragm 211a is stabilized, and the vibration of the car 5 is reduced. Therefore, as shown in fig. 21 (c), the change of the diaphragm 211a is reduced, and the diaphragm 211a returns to a substantially flat state. Then, when the car 5 approaches the stop floor, the car 5 performs deceleration traveling. At this time, as shown in fig. 21 (d), the air pressure applied to the diaphragm 211a becomes a "positive pressure" state, and the upward air pressure is applied, contrary to the acceleration in fig. 21 (b), due to the abrupt speed change of the car 5 accompanying the preparation for stopping. As a result, as shown in fig. 21 (d), the diaphragm 211a is deformed into an arc shape protruding in the upward direction. A voltage is generated in association with the deformation of the diaphragm 211 a. Here, the voltage is set to a voltage in the +direction. The deceleration running when the car 5 descends is a deceleration running in a negative direction.

Fig. 22 is a diagram showing a relationship between the output voltage of the detecting unit 21d and the traveling speed of the car 5 when the car 5 is lowered. In fig. 22 (a), the horizontal axis represents time, and the vertical axis represents the output voltage of the detection unit 21 d. In fig. 22 (b), the horizontal axis represents time and the vertical axis represents the traveling speed of the car 5. Fig. 23 is a diagram showing a relationship between the sound pressure level change of the sound content and the output voltage of the detection unit 21d when the car 5 is lowered. In fig. 23 (a), the horizontal axis represents time and the vertical axis represents sound pressure level of the audio content. Fig. 23 (b) is the same as fig. 22 (a).

As described above, when the sensor element 211 of the detection unit 21d is configured by a piezoelectric element, the diaphragm 211a changes to an arc shape due to the piezoelectric change, and the output voltage of the sensor element 211 changes in accordance with the amount of change in the arc (i.e., the amplitude). As a result, the voltage output from the detection unit 21d increases and decreases. The diaphragm 211a is changed into an arc shape by a pressure change accompanying the movement of the car 5 outside the body of the detection portion 21 d. The detection unit 21d detects that the car 5 vibrates according to the change of the diaphragm 211a, and outputs the +direction voltage or the-direction voltage as a detection signal.

In fig. 22, in the time division (ST 3), the car 5 is stopping. At this time, as shown in fig. 21 (a), the diaphragm 211a of the sensor element 211 of the detection unit 21d is in a flat state.

In fig. 22, in the time division (D1), the negative acceleration of the car 5 gradually increases in proportion to the hoisting speed of the hoisting machine 3 shown in fig. 1, and as shown in fig. 21 (b), the diaphragm 211a gradually protrudes in the downward direction. Along with this deformation of the diaphragm 211a, the value of the output voltage of the detection portion 21d also gradually decreases. Therefore, the time division (D1) is "rise time as negative voltage direction" of the output voltage of the detection section 21D.

In fig. 22, in the time division (D2), the negative acceleration of the car 5 gradually decreases in proportion to the hoisting speed of the hoisting machine 3 shown in fig. 1, and the protruding amount of the diaphragm 211a also gradually decreases. With this deformation of the diaphragm 211a, the value of the output voltage of the detection portion 21d gradually increases to be close to 0. Therefore, the time division (D2) is "a falling time in the negative voltage direction" of the output voltage of the detection section 21D.

The total time length of the time divisions (D1) and (D2) in fig. 22 is about 5 seconds. With this time, the sound field control unit 21a of the sound field control device 21 gradually increases the sound pressure level of the sound content radiated into the car 5.

In fig. 22, in the time division (D3), the car 5 travels at a constant speed, and the acceleration of the car 5 is 0 or substantially 0. With this, as shown in fig. 21 (c), the diaphragm 211a is in a substantially flat state. At this time, the output voltage of the detection unit 21d is 0 or substantially 0.

As shown in fig. 23 (a), the sound field control unit 21a of the sound field control device 21 performs a "fade-in" process of gradually increasing the sound pressure level of the sound content radiated into the car 5 in the time divisions (D1) and (D2). The sound field control section 21a stops the "fade-in" process at the timing when the sound pressure level reaches the maximum value Max. Then, in the time division (D3), the sound field control unit 21a radiates sound contents into the car while maintaining the sound pressure level of the maximum value Max.

In fig. 22, in the time division (D4), the car 5 approaches the stop floor, and the car 5 decelerates. That is, when the car 5 approaches the stop floor, the rotation of the hoisting machine 3 shown in fig. 1 is controlled, and the braking operation is applied to change to the stop state of the car 5 with a relatively strong force. As shown in fig. 21 (d), the diaphragm 211a gradually protrudes upward due to the air pressure change caused by sudden braking at this time. Along with this deformation of the diaphragm 211a, the value of the output voltage of the detection portion 21d also gradually increases. Therefore, the time division (D4) is "rise time as positive voltage direction" of the output voltage of the detection section 21D.

In fig. 22, in the time division (D5), the acceleration of the car 5 gradually decreases in proportion to the hoisting speed of the hoisting machine 3 shown in fig. 1, and the protruding amount of the diaphragm 211a also gradually decreases. With this deformation of the diaphragm 211a, the value of the output voltage of the detection unit 21d gradually decreases to approach 0. Therefore, the time division (D5) is "a falling time in the positive voltage direction" of the output voltage of the detection section 21D.

The total time length of the time divisions (D4) and (D5) in fig. 22 is about 5 seconds. With this time, the sound field control unit 21a of the sound field control device 21 gradually reduces the sound pressure level of the sound content radiated into the car 5.

In fig. 22, in the time division (ST 4), the car 5 is stopping. At this time, as shown in fig. 21 (a), the diaphragm 211a of the sensor element 211 of the detection portion 21d has been restored to a flat state.

As shown in fig. 23 (a), the sound field control unit 21a of the sound field control device 21 performs a "fade-out" process of gradually reducing the sound pressure level of the sound content radiated into the car 5 in the time divisions (D4) and (D5). The sound field control section 21a of the sound field control device 21 stops the "fade-out" process at the timing when the sound pressure level reaches the minimum value Min. Then, in the time division (ST 4), the sound field control unit 21a of the sound field control device 21 radiates sound content into the car while maintaining the sound pressure level of the minimum value Min.

As described above, the output of the detection unit 21d when the car 5 is lowered is opposite to the output when the car 5 is raised. That is, in fig. 22, in the time divisions (D1) and (D2), the detection unit 21D outputs the voltage in the-direction as shown in fig. 22 in the state of the acceleration running when the car 5 is lowered. In the time division (D3), the voltage value output by the detection unit 21D is 0 or substantially 0 in the state of uniform traveling when the car 5 is descending. In the time divisions (D4) and (D5), the detection unit 21D outputs the voltage in the +direction in a state of decelerating when the car 5 is descending.

The sound field control unit 21a determines the traveling state of the car 5 based on the output of the detection unit 21 d. Specifically, when the detection unit 21d outputs a voltage in the direction when the car 5 is lowered, the sound field control unit 21a determines that the car 5 is in an acceleration state. When the voltage value output from the detection unit 21d becomes 0 or substantially 0 after the state of the voltage in the-direction, the sound field control unit 21a determines that the car 5 is in a constant speed state when it is descending. When the voltage value outputted from the detection unit 21d is 0 or substantially 0 and then the voltage in the +direction is changed, the sound field control unit 21a determines that the car 5 is in a decelerating state when it is descending. When the voltage value output from the detection unit 21d becomes 0 or substantially 0 after the state of the voltage in the +direction, the sound field control unit 21a determines that the car 5 is in the stopped state. The sound field control unit 21a adjusts the sound pressure level of the sound content in accordance with the determined state of the car 5.

Fig. 24 and 25 are diagrams showing threshold values set for the output voltage of the detection unit 21 d. The threshold values shown in fig. 24 and 25 may be set for the output voltage of the detection unit 21d, as needed. The reason for this will be explained below.

As shown in fig. 1, the car 5 is suspended by means of the main rope 4. Therefore, a case can be assumed in which vibrations are generated transiently when the user intentionally makes noise in the car 5. Therefore, as shown in fig. 24, a threshold value is set in advance for the "rise time in the positive voltage direction" of the output voltage of the detection portion 21D (time division (U1) of fig. 19 and time division (D4) of fig. 23). In the following, this threshold is referred to as a 2 nd threshold Th2. When the output voltage of the detection unit 21d increases, the sound field control unit 21a determines that the "rise time in the positive voltage direction" of the output voltage of the detection unit 21d is reached when the increased state continues for a period equal to or longer than the 2 nd threshold Th2. This can prevent the sound field control unit 21a from making an erroneous determination of the vibration due to the transient state.

Similarly, as shown in fig. 24, a threshold value is also set in advance for the "fall time in the positive voltage direction" of the output voltage of the detection portion 21D (time division (U2) of fig. 19 and time division (D5) of fig. 23). In the following, this threshold is referred to as a 3 rd threshold Th3. When the output voltage of the detection unit 21d decreases, the sound field control unit 21a determines that the "time to decrease in the positive voltage direction" of the output voltage of the detection unit 21d is reached when the decreased state continues for a period equal to or longer than the 3 rd threshold value Th3. This can prevent the sound field control unit 21a from making an erroneous determination of the vibration due to the transient state.

Similarly, as shown in fig. 25, a threshold value is also set for the "negative voltage direction fall time" of the output voltage of the detection portion 21D (time division (U4) of fig. 19 and time division (D1) of fig. 23). In the following, this threshold is referred to as a 4 Th threshold Th4. When the output voltage of the detection unit 21d decreases, the sound field control unit 21a determines that the "rise time in the negative voltage direction" of the output voltage of the detection unit 21d is reached when the decreased state continues for a period equal to or longer than the 4 Th threshold Th4. In addition, similarly, a threshold value is also set in advance for "falling time in the negative voltage direction" (time division (U5) of fig. 19 and time division (D2) of fig. 23). In the following, this threshold is referred to as a 5 Th threshold Th5. When the output voltage of the detection unit 21d increases, the sound field control unit 21a determines that the "negative voltage direction falling time" of the output voltage of the detection unit 21d is reached when the increased state continues for a period equal to or longer than the 5 Th threshold Th5. This can prevent the sound field control unit 21a from making an erroneous determination of the vibration due to the transient state.

In the above description, as shown in fig. 4, the sound system 13 is described taking as an example a case where the sound field control device 21 and the speaker system 22 are separately arranged. However, this is not a limitation. Fig. 26 is a diagram showing a configuration of a modification of the acoustic system 13 of embodiment 1. As shown in fig. 26, the sound field control apparatus 21 and the speaker system 22 may be disposed in the housing 210 of the sound field control apparatus 21. That is, the detection unit 21d is also disposed in the housing 210. In the case of the configuration of fig. 26, the sound field control device 21 and the speaker system 22 are disposed in one housing 210, and the sound system 13 is packaged. Therefore, when the acoustic system 13 is installed, a process such as wiring is not required, and the installation of the acoustic system 13 is extremely easy. In addition, the acoustic system 13 of fig. 26 may be provided instead of the emergency speaker 5g shown in fig. 2. In this case, only the wiring originally connected to the emergency speaker 5g may be connected to the acoustic system 13 again. The acoustic system 13 shown in fig. 26 is packaged, and can be easily installed in the existing elevator 1. In fig. 26, an example in which one speaker box 20 is provided is shown, but the number of speaker boxes 20 may be two or more. The number of speaker units 23 in the speaker box 20 may be any number of one or more.

In the above description, the case where the detection unit 21d is constituted by an acceleration sensor, and the sound field control unit 21a determines whether the state of the car 5 is acceleration running, constant speed running, deceleration running, or stopping based on the physical quantity detected by the detection unit 21d has been described as an example. In this case, as shown in fig. 16, the physical quantity at the time of uniform traveling may be equal to the physical quantity at the time of car stopping. Therefore, the sound field control unit 21a may determine whether the car 5 is in a stopped state or in a constant-speed traveling state by the following determination method, for example. Taking fig. 16 as an example, the time divisions (1), (3), (5), and (7) are the stopped states of the car 5. Taking the time division (3) as an example, the sound field control unit 21a determines that the car 5 is stopped, not traveling at a constant speed, when the time length between the time division (2) and the time division (4) is longer than a preset set time. That is, the sound field control unit 21a determines that the car 5 is in the stopped state when the output of the acceleration sensor indicating the next traveling (ascending or descending) (i.e., the output of the time division (4)) is not generated even if the preset set time elapses after the output of the acceleration sensor indicating the traveling (ascending or descending) of the car 5 (i.e., the output of the time division (2)) is generated. More specifically, when positive or negative "rising" is not generated even after the positive or negative "falling" is generated, the sound field control unit 21a determines that the car 5 is in the stopped state. On the other hand, when a positive or negative "rise" occurs before a preset set time elapses after a positive or negative "fall" occurs, the sound field control unit 21a determines that the car 5 is in a state of traveling at a constant speed. The set time is set to, for example, 3 minutes. However, the setting time is not limited to this case, and may be set to other time periods as appropriate. The constant speed running at the time of the rise of the time division (U3) shown in fig. 17 and the constant speed running at the time of the fall of the time division (D3) shown in fig. 23 do not last for 3 minutes or more. Therefore, if the sound field control unit 21a uses this determination method to determine whether the car 5 is in the stopped state or the constant-speed running state, erroneous determination is not made.

In the above description, the case where the detection unit 21d is constituted by an acceleration sensor is described as an example. However, as described above, the detection unit 21d may be constituted by an air pressure sensor or a speed sensor.

Fig. 27 is a diagram showing a relationship between the detection result and the sound pressure level of the acoustic content in the case where the detection unit 21d is a barometric sensor. Fig. 27 (a) shows a change in sound pressure level of the acoustic content by control of the sound field control unit 21a, and fig. 27 (b) shows a waveform of a detection result of the detection unit 21d constituted by the air pressure sensor. The detection result of fig. 27 (b) shows the same tendency as the detection result of fig. 20 (b). Therefore, it is known that even when the detection result of the detection unit 21d made up of the air pressure sensor is used, the sound field control unit 21a can perform the "fade-in" process and the "fade-out" process similar to those described above. In the case where the detecting portion 21d is constituted by an air pressure sensor, the detecting portion 21d is provided on, for example, an outer surface of the side plate 5a of the car 5.

In addition, when the detection unit 21d is constituted by a speed sensor, the detection result of the detection unit 21d is a waveform shown in fig. 17 (b) and fig. 22 (b). Therefore, when the detection result of the detection unit 21d made up of the speed sensor is used, the "fade-in" process is performed in the period from time t1 to time t2d in fig. 17 (b) and 22 (b), and the "fade-out" process is performed in the period from time t3 to time t4 in fig. 17 (b) and 22 (b). In this way, even when the detection result of the detection unit 21d constituted by the speed sensor is used, the sound field control unit 21a can perform the "fade-in" processing and the "fade-out" processing similar to those described above.

As described above, the acoustic system 13 of embodiment 1 includes the detection unit 21d and the sound field control unit 21a. The detection unit 21d detects a physical quantity indicating the traveling state of the car 5 of the elevator 1. The sound field control unit 21a controls reproduction and stop of the sound content based on the physical quantity detected by the detection unit 21 d. In patent document 1, since the user plays and stops the audio content, there is a possibility that the playback of the audio content may become stressed by other users when the user makes a miscreant. In contrast, in the acoustic system 13 according to embodiment 1, the sound field control unit 21a controls reproduction and stop of the acoustic content, so that it is possible to prevent the pressure of other users from being applied.

In the acoustic system 13 according to embodiment 1, the detection unit 21d detects physical quantities indicating states of acceleration travel, uniform velocity travel, deceleration travel, and stop, respectively, when the car 5 is lifted up and lowered down. The sound field control unit 21a determines which of the acceleration running, the constant speed running, the deceleration running, and the stopping the car 5 is based on the physical quantity detected by the detection unit 21d, and adjusts the sound pressure level of the sound content in accordance with the determined state. In this way, the sound field control unit 21a can adjust the sound pressure level of the sound content in accordance with the traveling state of the car 5. Therefore, if the control for lowering the sound pressure level of the audio content is performed at the stop floor, the audio content can be provided in which the pressure of the user is reduced without interfering with the voice broadcast to the user.

The acoustic system 13 according to embodiment 1 controls reproduction and stop of acoustic content based on the physical quantity detected by the detection unit 21 d. The sound system 13 does not need information from the operation system such as the elevator control panel 7 for operating the elevator 1. Therefore, the acoustic system 13 is not electrically connected to the operation system. Therefore, the sound system 13 is not required to perform complicated operations such as wiring operations with the operating system, and it is only required to be disposed in the car 5, and thus it is possible to easily install the existing elevator.

In the sound system 13 according to embodiment 1, the sound field control unit 21a performs a fade-in process of gradually increasing the sound pressure level of the sound content when it is determined that the car 5 is in the state of accelerating when it is ascending or descending. As a result, the sound pressure level of the sound content gradually increases from the time when the car 5 starts traveling to the time when the car travels at a constant speed. When a user encounters reproduction of sound content having a high sound pressure level immediately after riding on the car 5, the user may feel uncomfortable or uncomfortable. However, as in embodiment 1, by performing the fade-in process of gradually increasing the sound pressure level, the user can naturally adapt to the reproduction of the audio content and enjoy the reproduction.

In the sound system 13 according to embodiment 1, the sound field control unit 21a performs a fade-out process of gradually reducing the sound pressure level of the sound content when it is determined that the car 5 is in a state of decelerating when it is ascending or descending. Accordingly, the sound pressure level of the sound content gradually decreases from the time when the car 5 starts decelerating to the time when the car reaches the stop state. When the user does not hear the sound of the sound content any more suddenly immediately after the car 5 stops, the user may feel uncomfortable or uncomfortable. However, as in embodiment 1, by performing the fade-out process of gradually decreasing the sound pressure level, it is possible to prevent the user from feeling uncomfortable or uncomfortable. Further, since the sound pressure level of the sound content is the minimum value Min when the car 5 stops, it is possible to prevent the user from missing the voice broadcast, and the reproduced sound of the sound content does not leak to the landing of the stop floor. Therefore, it is possible to prevent the reproduction sound of the sound content from becoming noise to a person who does not use the elevator at the stop floor.

In the sound system 13 according to embodiment 1, the sound field control unit 21a performs control to maintain the sound pressure level of the sound content at a fixed value when it is determined that the car 5 is in a state of traveling at a constant speed during ascent or descent. The fixed value at this time is the maximum value Max. As described above, during traveling of the car 5, the sound transmitted into the car 5 is the "sliding sound" between the car guide shoe and the car guide rail portion and the "sliding sound" between the sheave 3a and the main rope 4. In embodiment 1, since the control is performed to maintain the sound pressure level of the sound content at the maximum value Max when the car 5 is traveling at a constant speed, the user does not feel the "slip sound" so much, and the user can feel the slip sound comfortably even in the closed car 5.

In addition, in the acoustic system 13 of embodiment 1, two or more speaker boxes 20 or two or more speaker units 23 may be provided. In this case, sound emission from a plurality of directions can be performed. Thereby, the sound field control unit 21a can form the three-dimensional sound field 27 in the closed space in the car 5. In general, a user often gets "embarrassed" and "uncomfortable" with an acquainted person in the car 5. In embodiment 1, since the audio content can be reproduced by the stereo sound field 27, it is possible to provide comfort to the user, and it is possible to reduce the stress caused by the "embarrassment" and "uncomfortable feeling" of the user.

As shown in fig. 4, the audio content may be prepared in advance for each season and each living time zone, and the audio content may be switched according to the actual season and living time zone. In this case, the user is not given a feeling of uniformity, and the user is able to feel season transitions, life time period changes, and the like, and is highly likely to feel "healing" and "relaxing". As a result, the user's pressure is further reduced.

Description of the reference numerals

1: an elevator; 2: a hoistway; 3: a traction machine; 3a: a rope pulley; 4: a main rope; 5: a car; 5a: a side plate; 5b: a floor; 5c: a ceiling panel; 5d: a car door; 5e: a lighting device; 5ea: an irradiation surface; 5f: a car operating panel; 5g: an emergency speaker; 5h: an interphone device; 7: an elevator control panel; 8: a control cable; 9: a car control device; 9a: an input unit; 9b: a control unit; 9c: an output unit; 9d: a storage unit; 10: suspending the ceiling; 10a: a side surface; 10b: a lower surface; 11: a void; 13: an elevator sound system (sound system); 20: a speaker cabinet; 21: a sound field control device; 21a: a sound field control unit; 21b: an output unit; 21c: a storage unit; 21d: a detection unit; 21e: a timer section; 22: a speaker system; 23: a speaker unit; 23-1: a speaker unit; 23-2: a speaker unit; 23L: a speaker unit; 23L-1: a speaker unit; 23L-2: a speaker unit; 23R: a speaker unit; 23R-1: a speaker unit; 23R-2: a speaker unit; 23a: a radiation surface; 25: a housing; 25a: a front face; 27: a sound field; 27a: a lower limit; 40: an acoustic content generating device; 40a: an output unit; 40b: a signal processing section; 40c: a storage unit; 40d: an input unit; 210: a housing; 211: a sensor element; 211a: a vibrating membrane; 211b: a support section; 211c: an outer housing; 212: a substrate.

Claims (12)

1. An acoustic system for an elevator, wherein the acoustic system for an elevator comprises:

a speaker system disposed on a ceiling of an inner space of a car of an elevator;

a storage unit that stores sound content emitted from the speaker system;

a sound field control unit that reproduces the sound content and causes the speaker system to radiate the sound content to the interior space of the car; and

a detection unit provided in the car and detecting a physical quantity indicating a traveling state of the car,

the sound field control unit determines a traveling state of the car based on the physical quantity detected by the detection unit, and adjusts the sound pressure level of the sound content in accordance with the traveling state of the car.

2. The sound system for an elevator according to claim 1, wherein,

the detection unit detects the physical quantities respectively representing states of acceleration running, uniform running, deceleration running and stopping when the car ascends and descends,

the sound field control unit determines which of the acceleration travel, the constant velocity travel, the deceleration travel, and the stop the car is in based on the physical quantity detected by the detection unit, and adjusts the sound pressure level of the sound content in accordance with the determined state of the car.

3. The sound system for an elevator according to claim 2, wherein,

the sound field control unit performs a fade-in process of gradually increasing the sound pressure level of the sound content emitted from the speaker system when it is determined that the car is in the state of the acceleration travel at the time of the ascent or the descent based on the physical quantity detected by the detection unit.

4. The sound system for an elevator according to claim 2 or 3, wherein,

the sound field control unit performs a fade-out process of gradually reducing the sound pressure level of the sound content emitted from the speaker system when it is determined that the car is in the state of the deceleration traveling at the time of the ascent or the descent based on the physical quantity detected by the detection unit.

5. The sound system for an elevator according to any one of claims 2 to 4, wherein,

the sound field control unit performs control to maintain the sound pressure level of the sound content emitted from the speaker system at a fixed value when it is determined that the car is in the state of the uniform traveling at the time of the ascent or the descent based on the physical quantity detected by the detection unit.

6. The sound system for an elevator according to claim 2, wherein,

the sound field control part

When it is determined that the car is in the state of the acceleration running at the time of the ascent or the descent based on the physical quantity detected by the detection unit, a fade-in process of gradually increasing the sound pressure level of the acoustic content radiated from the speaker system to a 1 st sound pressure level is performed,

when it is determined that the car is in the state of the constant speed running at the time of the ascent or the descent based on the physical quantity detected by the detection unit, control is performed to maintain the sound pressure level of the acoustic content emitted from the speaker system at the 1 st sound pressure level,

when it is determined that the car is in the state of the deceleration traveling at the time of the ascent or the descent based on the physical quantity detected by the detection unit, a fade-out process is performed in which the sound pressure level of the acoustic content emitted from the speaker system is gradually reduced from the 1 st sound pressure level to the 2 nd sound pressure level.

7. The sound system for elevator as claimed in claim 6, wherein,

the elevator has an emergency speaker which radiates voice broadcast to the space in the car,

The 2 nd sound pressure level is greater than 0 and less than the sound pressure level of the voice broadcast,

the 1 st sound pressure level is above the sound pressure level of the voice broadcast.

8. The sound system for an elevator according to any one of claims 2 to 7, wherein,

the sound field control unit performs control as follows: and stopping reproduction of the sound content when it is determined that the car is in the stopped state based on the physical quantity detected by the detection unit and the stopped state continues for a predetermined time equal to or longer than an unmanned determination threshold.

9. The sound system for an elevator according to any one of claims 1 to 8, wherein,

the detection unit is an acceleration sensor that detects, as the physical quantity, vibration and air pressure of the car that change in association with traveling and stopping of the car.

10. The sound system for an elevator according to any one of claims 1 to 8, wherein,

the detection unit is a speed sensor that detects the traveling speed of the car as the physical quantity.

11. The sound system for an elevator according to any one of claims 1 to 8, wherein,

the detection unit is an air pressure sensor that detects, as the physical quantity, an air pressure received by the car that changes in accordance with the running and stopping of the car.

12. The sound system for an elevator according to any one of claims 1 to 11, wherein,

the elevator sound system comprises a timer part for counting the current date and time,

the storage section stores a plurality of the sound contents created for each season and each life time period,

the sound field control unit acquires date and time data indicating the current date and time from the timer unit, reads out sound contents corresponding to an actual season and an actual living time period from the storage unit based on the date and time data, and causes the speaker system to radiate the sound contents.