WO2005089018A1 - 立体音響再生システムおよび立体音響再生装置 - Google Patents
立体音響再生システムおよび立体音響再生装置 Download PDFInfo
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- WO2005089018A1 WO2005089018A1 PCT/JP2005/003942 JP2005003942W WO2005089018A1 WO 2005089018 A1 WO2005089018 A1 WO 2005089018A1 JP 2005003942 W JP2005003942 W JP 2005003942W WO 2005089018 A1 WO2005089018 A1 WO 2005089018A1
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- 238000012545 processing Methods 0.000 claims abstract description 256
- 230000005236 sound signal Effects 0.000 claims abstract description 134
- 238000012546 transfer Methods 0.000 claims description 36
- 238000012937 correction Methods 0.000 description 27
- 238000000034 method Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 10
- 210000003128 head Anatomy 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000005855 radiation Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 2
- 235000016496 Panda oleosa Nutrition 0.000 description 1
- 240000000220 Panda oleosa Species 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
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- QGBQVPDZYFBQSM-UHFFFAOYSA-J diazanium;disodium;zinc;boric acid;hydroxy-(hydroxy(dioxo)chromio)oxy-dioxochromium;dichloride;sulfate;dihydrate Chemical compound [NH4+].[NH4+].O.O.[Na+].[Na+].[Cl-].[Cl-].[Zn+2].OB(O)O.[O-]S([O-])(=O)=O.O[Cr](=O)(=O)O[Cr](O)(=O)=O QGBQVPDZYFBQSM-UHFFFAOYSA-J 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S3/00—Systems employing more than two channels, e.g. quadraphonic
- H04S3/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
Definitions
- the present invention belongs to the technical field of a stereophonic sound reproduction device that performs sound reproduction with a sense of realism.
- a plurality of speakers such as a center speaker, left and right front speakers, and left and right rear speakers (also referred to as surround speakers), each have a role of a reproduced sound, and each speaker is provided with reverberation sound and frequency.
- a surround system for amplifying sounds such as voice or music is put to practical use.
- a typical example of such a surround system includes a center speaker in front of a listener and front speakers installed on the left and right sides thereof, and a surround speaker installed on the left or right rear or side of the listener.
- a subwoofer that exclusively loudspeaks only low frequencies below 120 Hz and a Dolby (registered trademark) digital 5-channel surround sound system are known.
- the surround speakers are integrally formed on the left and right sides so that the surround speakers can be easily set, and the surround speakers are installed behind the listening position to increase the volume.
- a left and right integrated surround speaker (hereinafter, simply referred to as an integrated surround speaker) is installed behind the listening position. You may not be able to.
- the integrated surround speakers are installed on either side of the listening position. For example, if the integrated surround speakers are placed on the right side, the left surround speakers are also installed on the right side. Therefore, it is difficult to provide a sound field space in which a high sense of reality can be obtained due to a sense of incongruity in sound image localization.
- the present invention has been made in view of the above-described problems, and one example of the problem is as follows.
- a surround system having a built-in surround speaker even if the surround sound speaker cannot be installed behind the listening position, even in such a case, surround sound reproduction that creates a sound field space with a high sense of realism can be achieved. It is to provide a system.
- the invention according to claim 1 loudspeakers corresponding to the respective audio signals based on a plurality of input audio signals, and provides a sound to a listener.
- a stereophonic sound reproduction device that provides a sound field space with a sense of presence; at least a pair of left and right main speakers that are installed in front of the listening position and amplify a main signal that is an audio signal corresponding to the speaker;
- a left surround speaker unit for forming the three-dimensional sound by loudspeaking a surround signal that is a leftward component sound signal, and a surround that is the rightward component sound signal with respect to the listening position.
- a right surround speaker for forming the three-dimensional sound by loudspeaking a signal, and an integrated surround speaker in which a body is molded.
- the stereophonic sound reproduction device is installed at a position where the integrated surround speakers are uneven in the left and right directions with respect to the listening position, a surround component having a direction component different from the direction in which the integrated surround speakers are decentered.
- Signal adjusting means for adjusting frequency characteristics of the signal based on a transfer function for forming a sound image at a predetermined listening position; and a main signal having the same direction component as the adjusted surround signal.
- output means for outputting to a corresponding surround speaker.
- the invention according to claim 7 provides a sound field having a sense of realism for a listener by loudspeakers corresponding to the respective sound signals based on a plurality of input sound signals.
- a stereophonic sound reproducing apparatus for providing a space, at least a pair of left and right main speakers installed in front of the listening position and loudspeaking a main signal which is an acoustic signal corresponding to the speed, and a left speaker with respect to the listening position.
- a left surround speaker unit for forming the stereophonic sound by loudspeaking a surround signal that is a sound signal of a directional component
- a right surround speaker unit for forming the three-dimensional sound by loudspeaking a surround signal which is the sound signal of the right component with respect to the listening position
- an integrated surround speaker in which a body is molded When the three-dimensional sound reproduction device is installed at a position where the integrated surround speaker is unequal to the left and right with respect to the listening position, a component of a direction different from the direction in which the integrated surround speaker is eccentric is provided.
- First arithmetic means for performing an arithmetic processing for adding the same, and the same directional component as the direction in which the integrated surround speaker is decentered.
- Second arithmetic means for performing arithmetic processing for subtracting the generated difference signal from the round signal, and adding means for adding at least a part of each of the arithmetically processed surround signals to each main signal having the same direction component;
- Output means for outputting each of the added main signals to the corresponding main speakers and outputting at least a part of each of the surround signals for which the difference signals have been calculated to the corresponding surround speakers. Doing and doing.
- the invention according to claim 8 provides each speaker corresponding to each sound signal based on the plurality of input sound signals to provide a sound field space with a sense of realism for a listener.
- a stereophonic sound reproducing device a pair of left and right main speakers installed in front of the listening position and loudspeaking a main signal that is an audio signal corresponding to the speed, and a left component of the listening position with respect to the listening position.
- a right surround speaker section for forming the body and an integrally formed surround speaker, and the stereophonic sound reproducing device comprises: When the integrated surround speaker is installed at a position that is unequal to the left and right with respect to the listening position, a predetermined surround sound signal having a direction component different from the direction in which the integrated surround speaker is decentered is set. Generating means for generating a delay component having a calculated delay time, calculating means for adding the generated delay component to a surround signal used for generating the delay component, and processing means for performing the arithmetic processing.
- the invention according to claim 9 provides a sound field having a sense of realism for a listener by loudspeakers corresponding to the respective sound signals based on a plurality of input sound signals.
- a stereophonic sound reproducing apparatus for providing a space, at least a pair of left and right main speakers installed in front of the listening position and loudspeaking a main signal which is an acoustic signal corresponding to the speed, and a left speaker with respect to the listening position.
- a left surround speaker unit for forming the three-dimensional sound by loudspeaking a surround signal that is a directional component sound signal; and a loudspeaker that surrounds the surround signal that is the right direction component with respect to the listening position.
- the integrated surround speaker When the integrated surround speaker is installed at a position unequal to the left and right with respect to the listening position, a surround signal force having a direction component different from the direction in which the integrated surround speaker is eccentric.
- Second arithmetic means for performing arithmetic processing for subtracting the generated delay component from the surround signal; and at least one of the surround signals subjected to the arithmetic processing.
- output means for outputting at least a part of the signal to each corresponding surround speaker.
- each speaker corresponding to each of the audio signals is loudspeaked so that the listener has a sense of realism.
- a stereophonic sound reproducing device for providing a sound field space, wherein the stereophonic sound reproducing device is provided in front of the listening position, and at least a pair of left and right main speakers for loudspeaking a main signal which is an acoustic signal corresponding to the speaker, and the sounding position.
- a left surround speaker section for forming the stereophonic sound by loudspeaking a surround signal as a leftward component sound signal, and a surround signal as the rightward component acoustic signal with respect to the listening position.
- the right surround speaker section for forming the three-dimensional sound and the integrally formed surround speaker are loudspeakers, and the integrated surround speaker does not move right and left around the listening position. When installed in an even position, the direction of the integrated surround speaker differs from that of the eccentric direction.
- an output unit for outputting the unit to a corresponding surround speaker.
- the invention according to claim 11 provides a sound field space with a sense of realism for a listener by loudspeakers corresponding to the respective sound signals based on the plurality of input sound signals.
- a stereophonic sound reproducing device which is installed in front of the listening position, and at least a pair of left and right main speakers for loudspeaking a main signal which is an acoustic signal corresponding to the speaker, and an acoustic signal of a leftward component with respect to the listening position.
- a left surround speaker unit for forming the three-dimensional sound by loudspeaking the surround signal, and forming the three-dimensional sound by loudspeaking the surround signal which is the sound signal of the right component with respect to the listening position.
- a right surround speaker section for performing sound amplification with a physically formed integrated surround speaker.
- the surround speakers are installed at positions unequal to the left and right around the listening position, the surround signal in the eccentric direction is subtracted from the surround signal in a direction component different from the direction in which the integrated surround speaker is eccentric.
- Generating means for generating a differential signal; and a surround signal having a direction component different from the direction in which the integrated surround speaker is decentered.
- First arithmetic means for performing an arithmetic process of adding the generated difference signal to the signal, and subtracting the generated difference signal from a surround signal having the same directional component as the direction in which the integrated surround speaker is decentered.
- Signal adjusting means for adjusting frequency characteristics based on the second arithmetic means for performing arithmetic processing, and adding at least a part of each of the arithmetically processed surround signals to each of the main signals having the same direction component Addition means, and output means for outputting the added main signals to the corresponding main speakers and outputting at least a part of the surround signals for which the difference signals have been calculated to the corresponding surround speakers.
- the invention according to claim 12 provides a sound field space with a sense of realism for a listener by loudspeakers corresponding to the respective sound signals based on the plurality of input sound signals.
- a stereophonic sound reproducing apparatus provided in front of the listening position, wherein at least a pair of left and right main speakers for loudspeaking a main signal which is an acoustic signal corresponding to the speaker, and a leftward component with respect to the listening position.
- a predetermined delay time is set for a surround signal having a direction component different from the direction in which the integrated surround speaker is decentered.
- Generating means for generating a delay component having: a processing means for adding the generated delay component to a surround signal used for generating the delay component; and Adding means for adding at least a part of the component of the surround signal subjected to the arithmetic processing to the main signal of the same direction as the main signal; outputting the added main signal to the corresponding main speaker; Output means for outputting at least a part of the surround signal to which the sum has been added to a corresponding surround speaker. And a configuration that, Ru.
- each speaker corresponding to each of the audio signals is loudspeaked so that the listener has a sense of presence.
- a stereophonic sound reproducing device for providing a sound field space, wherein the stereophonic sound reproducing device is provided in front of the listening position, and at least a pair of left and right main speakers for loudspeaking a main signal which is an acoustic signal corresponding to the speaker, and the sounding position.
- a left surround speaker section for forming the stereophonic sound by loudspeaking a surround signal as a leftward component sound signal, and a surround signal as the rightward component acoustic signal with respect to the listening position.
- the right surround speaker section for forming the three-dimensional sound and the integrally formed surround speaker are loudspeakers, and the integrated surround speaker does not move right and left around the listening position.
- the direction of the integrated surround speakers differs from the direction in which they are eccentric.
- Second arithmetic means for performing an arithmetic process of subtracting the generated delay component from a surround signal of the same direction component, and adding at least a part of each of the surround signals subjected to the arithmetic process to each main signal of the same direction component Adding means for outputting each of the added main signals to the corresponding main speed and calculating the delay component.
- was also reduced in the surround signal has a configuration having output means for outputting to the surround speakers to the appropriate part of the.
- FIG. 1 is a block diagram showing a configuration of a surround system according to a first embodiment of the present invention.
- FIG. 2 is an example for explaining each speaker installation in the surround system of the first embodiment.
- FIG. 3 is a block diagram illustrating a configuration of a signal processing unit according to the first embodiment.
- FIG. 4 is an example of a graph of a head-related transfer function used when correcting the frequency characteristic in the frequency correction circuit of the first embodiment.
- FIG. 5 is an example of a level ratio graph used when correcting the frequency characteristics in the frequency correction circuit of the first embodiment.
- FIG. 6 is a block diagram illustrating a configuration of a signal processing unit according to a second embodiment.
- FIG. 7 is a block diagram illustrating a configuration of a signal processing unit according to a third embodiment.
- FIG. 8 is a block diagram illustrating a configuration of a signal processing unit according to a fourth embodiment.
- FIG. 1 lch surround system (hereinafter, simply referred to as a surround system).
- FIG. 1 is a block diagram showing the configuration of the surround system according to the present embodiment
- FIG. 2 is an example for explaining each speaker installation in the surround system according to the present embodiment.
- the surround system 100 of the present embodiment is installed in a listening room 10, ie, a sound field space for providing a sound to be reproduced to a listener.
- a sound source is reproduced or obtained, and predetermined signal processing is performed on the reproduced sound or the obtained sound.
- the surround system 100 includes a speaker system 130 including a plurality of speakers including an integrated surround speaker 133 in which left and right surround speaker units are integrally formed.
- the sound is amplified for each speaker unit to provide a sound field space with a sense of realism (surround) to the listener!
- the surround system 100 reproduces a sound source such as a recording medium or obtains a sound source from an external source such as a television signal, thereby obtaining a channel (also referred to as a channel) corresponding to each speaker.
- a sound source output device 110 that outputs bit stream data of a certain format having components, and a bit stream output from the sound source output device 110 is decoded into an audio signal for each channel, and a signal is output for each audio signal of each channel.
- the signal processing device 120 includes a signal processing device 120 that performs processing, and a speaker system 130 having various speaker powers corresponding to each channel.
- a channel refers to a signal transmission path of an audio signal output from the sound source output device 110, and each channel transmits an audio signal that is basically different from other channels. .
- the sound source output device 110 is, for example, a CD (Compact disc) or a DVD (Digital Versatile).
- the sound source output device 110 of the present embodiment is a CP-1201 standard Z The standard developed by an optical digital interface based on the SPDIF standard (CFEITA, Japan Electronics and Information Technology Industries Association).
- the signal processing device 120 is configured to receive bit stream data having the respective channel components output from the sound source output device 110, and the signal processing device 120 Is decoded into an audio signal for each channel.
- the audio signal thus processed is converted into an analog signal to adjust the signal level. Then, the signal processing device 120 outputs each audio signal whose signal level has been adjusted to each speaker of the speaker system 130.
- the signal processing device 120 in the present embodiment constitutes the stereophonic sound reproducing device of the present invention.
- the speaker system 130 includes a center speaker 131 installed in front of the listening position, and a front left speaker (hereinafter, referred to as a left or right side of the center speaker 131 installed in front of the listening position.
- 132FL and front right speaker hereafter referred to as FR ⁇ p force
- 132FL speaker unit 133a for amplifying the left component for surround and speaker unit 133b for amplifying the right component for surround Integrated surround speaker that is molded physically 1 33
- a low-frequency reproduction speaker hereinafter, referred to as a subwoofer
- the FL speaker 132FL and the FR speaker 132FR of the present embodiment form a main speaker of the present invention
- the integrated surround speaker 133 forms an integrated surround speaker 133 of the present invention
- center speaker 131 is formed of a full-band speaker having a frequency characteristic that can be reproduced over almost the entire frequency band when an audio signal is loudspeaked, and listens to the radiation axis thereof. It is designed to louder the audio signal to the audience.
- the center speaker 131 be installed with its radiation axis directed to the listening position (listening point) of the listener, but the listening position is arranged within the directional angle of the center speaker 131. It is installed at the position!
- the FL speaker 132FL and the FR speaker 132FR are all-band type speakers having frequency characteristics that can be reproduced over almost the entire frequency band when loudspeaking an audio signal. With the radiation axis directed to the listening position, each signal is loudspeaked!
- the FL speaker 132FL and the FR speaker 132FR have their radiation axes inclined at a fixed angle, for example, 30 degrees with respect to the axis connecting the radiation axis of the center speed force 131 and the listener's listening position. It is desirable that the listening position be set at a directional angle of the FL speaker 132FL and the FR ⁇ P force 132FR.
- the integrated surround speaker 133 is, like the center speaker 131, a left component loudspeaker for a full-band surround having a frequency characteristic that can be reproduced over almost the entire frequency band when an audio signal is loudspeaked.
- a unit (hereinafter, referred to as a left speed unit) 133a and a speaker unit for rightward component loudspeaker (hereinafter, referred to as a right speed unit) 133b are integrally formed. It has become.
- the integrated surround speaker 133 is usually placed behind the listening position due to its nature, that is, more accurately, on a line connecting the center speaker 131 and the listening position.
- the present embodiment is a three-dimensional sound system that is applied when the integrated surround speaker 133 cannot be installed behind the listening position because there is no space behind the listening position. . Therefore, in the present embodiment, a case will be described in which the integrated surround-speech force 133 is installed at a position that is unequal to the left and right with respect to the listening position, for example, as shown in FIG.
- the subwoofer has a frequency characteristic for reproducing only a bass sound, for example, a frequency of several hundred Hz to several kHz, and is basically constituted by a speaker having an omnidirectional directional characteristic. It has become.
- the subwoofer is installed near the center speaker 131.
- the subwoofer has an omnidirectional characteristic and can be installed at any place.
- the signal processing device 120 receives bit stream data of a predetermined format having each channel component, and uses the bit stream data when decoding it into an audio signal for each channel.
- An input processing unit 121 that converts the audio data into signal format audio data; a decoding unit that decodes the converted audio data into an audio signal for each channel; and performs signal processing for each channel, particularly, an audio corresponding to the integrated surround speaker 133.
- a signal processing unit 200 for performing a specific process on the signal.
- the signal processing device 120 includes a DZA converter 122 that performs digital Z-analog (hereinafter, referred to as DZA) conversion on the audio signal of each channel, and a signal level of the signal of each channel for each channel. It has a power amplifier 123 for amplifying the signals, an operation unit 124 for operating each unit, and a system control unit 125 for controlling each unit based on the operation of the operation unit 124.
- DZA digital Z-analog
- Bit stream data of a predetermined format having each channel component is input to the input processing unit 121, and the input processing unit 121 converts the input bit stream data into a predetermined format. Then, the converted audio data is output to the signal processing unit 200.
- the input processing unit 121 is configured to convert input bit stream data into audio data of a three-wire audio serial interface.
- the bit stream data is converted into a bit clock signal, an LR clock signal, and compressed audio data, and output to the signal processing unit 200.
- the audio data output from the input processing unit 121 is input to the signal processing unit 200.
- the signal processing unit 200 converts the input audio data into an audio signal for each channel.
- predetermined signal processing is performed for each channel, and an audio signal is output to each DZA transformer 122 for each channel.
- the DZA converter 122 receives each audio signal that has been subjected to signal processing for each channel, and the DZA converter 122 uses the input digital signal. Each audio signal is converted to an analog signal and output to each power amplifier 123.
- An audio signal processed for each channel is input to the power amplifier 123.
- the power amplifier 123 is designated by the operation unit 124 under the control of the system control unit 125.
- the signal level of the audio signal for each channel is amplified based on the specified volume instruction, and the amplified audio signal is output to each speaker corresponding to each channel.
- the operation unit 124 is constituted by a remote control device including various keys such as various confirmation buttons, selection buttons, and numeric keys or various key buttons.
- the integrated surround speaker 133 is It is used to input the installation location.
- the system control unit 125 comprehensively controls the overall function for vocalizing an audio signal from each speaker to perform stereophonic sound reproduction.
- the system control unit 125 differs from the direction in which the integrated surround speaker 133 is eccentric.
- the signal processing unit 200 is controlled for the audio signal of the directional component to perform a predetermined signal processing.
- FIG. 4 is a graph of a head-related transfer function used when performing frequency characteristic correction in a frequency correction circuit according to the present embodiment. This is an example.
- FIG. 5 is an example of a graph of a level ratio used when correcting the frequency characteristics in the frequency correction circuit 204 of the present embodiment.
- the signal processing unit 200 includes a decoder 201 that decodes the input audio data into an audio signal for each channel, a DSP processing unit 202 that performs predetermined digital signal processing by operating a user's operation unit 124, For each of the left and right audio signals (hereinafter referred to as surround signals) amplified by the surround speakers, a switching control unit 203 for selecting one of the surround signals, and the surround selected by the switching control unit 203.
- a frequency correction circuit 204 that corrects the frequency characteristics of the signal, and a surround signal whose frequency characteristics have been corrected is an DSP-processed audio signal (hereinafter, referred to as a main signal) that is amplified from a main speaker. ) Is added to the addition processing unit 205.
- the DSP processing unit 202, the switching control unit 203, and the addition processing unit 205 are connected to the system control unit 125 by a node 206, and each unit performs each operation under the instruction of the system control unit 125. Is supposed to do it. Further, for example, the frequency correction circuit 204 of the present embodiment constitutes a signal adjusting unit of the present invention, and the addition processing unit 205 constitutes an adding unit and an output unit of the present invention.
- the decoder 201 receives input audio data, for example, a bit clock signal, an LR clock signal, and compressed audio data.
- the decoder 201 converts the input audio data into The audio signal is decoded into an audio signal for each channel and output to the DSP processing unit 202 for each channel.
- the DSP processing unit 202 receives a decoded audio signal for each channel.
- the DSP processing unit 202 controls the operation unit 124 under the control of the system control unit 125.
- the DSP processing unit 202 Digital signal processing such as delay processing for each channel, correction processing of frequency characteristics, addition processing of an arbitrary audio signal to audio signals of other channels so that input audio data is amplified in the sound field I'm going to do it.
- the DSP processing unit 202 outputs the surround signal to the switching control unit 203 and outputs the main signal to the addition processing unit 205.
- an audio signal (hereinafter, referred to as a center signal) loudspeaked from the center speaker 131 and an audio signal (hereinafter, referred to as woofer signal) loudspeaked from the subwoofer are based on the set position of the integrated surround speaker 133. Since there is no need to perform signal processing, this DSP processing unit 202 outputs the center signal and the woofer signal directly to the DZA converter 122, respectively.
- the switching control unit 203 receives a left surround signal to be loudspeaked by the left speaker unit and a right surround signal to be loudspeaked by the right speaker unit. Under the control of the system control unit 125, the switching control unit 203 outputs one of the input left and right surround signals to the frequency correction circuit 204 and does not output the signal to the frequency correction circuit 204.
- the surround signal is output to the addition processing unit 205.
- the integrated surround speaker 133 is installed on the left or right side of the listening position, that is, the integrated speaker is unevenly positioned on the left and right around the listening position. If the integrated surround speaker 133 is installed at a certain position and the instruction to that effect is input to the switching control unit 203 through the system control unit 125, the switching control unit 203 is installed. A surround signal for loudspeaking on a side different from the side on which the signal has been output is output to the frequency correction circuit 204. Further, in this case, the switching control unit 203 makes a sound increase at the side where the integrated surround speaker 133 is installed. The surround signal is directly output to the addition processing unit 205.
- the switch control unit 203 outputs the left surround signal. Is output to the frequency correction circuit 204, and the right surround signal is output to the addition processing unit 205.
- the system control unit 125 does not output an instruction for executing the switching control to the switching control unit 203, so that the switching control unit 203 The data is directly output to the addition processing unit 205.
- One of the surround signals is input to the frequency correction circuit 204, and the frequency correction circuit 204 generates a level ratio of a frequency transfer function stored in advance therein.
- the input surround signal is adjusted based on the data (hereinafter, referred to as level ratio data), and the adjusted surround signal is output to the addition processing unit 205.
- the frequency correction circuit 204 includes an ideal head-related transfer function (hereinafter, referred to as an ideal transfer function) when the surround speakers are installed at fixed positions, and a surround speaker on either the left or right side.
- an ideal transfer function when the surround speakers are installed at fixed positions, and a surround speaker on either the left or right side.
- Level ratio data in which the ratio between the listening position and the head transfer function (hereinafter referred to as the actual transfer function) when installed on a side different from the fixed position is stored in advance.
- the frequency correction circuit 204 multiplies the input surround signal by this level ratio, and outputs the multiplied surround signal to the addition processing unit 205. It's like that.
- the level ratio at each frequency is calculated from the ideal transfer function fl and the actual transfer function f2 calculated in advance, and the calculated level ratio R at each frequency is input to the surround signal. Is to be multiplied.
- the surround signal that has undergone such arithmetic processing is also installed behind the listening position when the integrated surround speaker 133 is installed on the right side of the listening position and loudspeaked. And has the property of being recognized as being loud.
- the head-related transfer function is a transfer function that expresses the transfer characteristics of a sound source to a listener's eardrum in a space (free space) where there is no reflected wave. Yes, indicates a function that contains physical information for a person to judge the sound image
- Each of the main signals, the surround signal output from the switching control unit 203, and the surround signal whose frequency is adjusted are input to the addition processing unit 205, and control of the system control unit 125 is performed.
- the main signal and the surround signal are added and the surround signal is output, and each main signal and each surround signal are output to each DZA converter.
- this is a case where the integrated surround speaker 133 is installed on either side of the listening position, that is, the integrated speaker becomes uneven left and right around the listening position. If it is installed at a location, the system control
- the addition processing unit 205 loudspeakers a predetermined component of the surround signal whose frequency characteristics have been corrected from the main speaker in the same direction with respect to the listening position.
- the DZA variation corresponding to the main signal is output to the DZA variation corresponding to the main signal, and the DZA variation corresponding to the surround signal is reduced by lowering the level of the surround signal having the corrected frequency characteristic. Output.
- the addition processing unit 205 multiplies the left surround signal by a predetermined coefficient, adds the left surround signal to the left main signal, outputs the left main signal, and outputs the left surround signal. Force A signal obtained by subtracting the left surround signal multiplied by a predetermined coefficient is output as a left surround signal.
- the addition processing unit 205 controls the A part of the surround signal is added to the main signal, and the remainder of the surround signal is output to the DZA converter as the surround signal.
- the addition processing unit 205 corrects the frequency characteristics of the main signal.
- a signal obtained by multiplying a surround signal by a coefficient (0.7) is added, and a signal obtained by multiplying a surround signal whose frequency characteristics have been corrected by a coefficient (0.3) is output as a surround signal. ! /
- the addition processing unit 205 normalizes each main signal and the surround signal when adding the surround signal whose frequency characteristics have been corrected to the main signal. That is, even if the main signal and the surround signal are added, the value does not exceed 1.0, and the level of each main signal and each surround signal is adjusted based on that value. It has become. However, when output to each DZA converter, the addition processing unit 205 expands the normalized signal level of each main signal and each surround signal to the original signal level, and It has come to compensate. In the present embodiment, the adjustment of the signal level of each signal may not be performed by the addition processing unit 205, but may be compensated by each power amplifier 123 via the system control unit 125.
- system control unit 125 switches to addition processing unit 205. Since no instruction for executing the control is output, the addition processing unit 205 outputs each of the input surround signals and each of the main signals directly to each of the DZ signals. .
- the surround system 100 of the present embodiment loudspeakers corresponding to the respective audio signals based on the input plurality of audio signals, respectively, to provide the listener with a sense of realism.
- a signal processing device 120 for providing a certain sound field space, at least a pair of left and right main speakers installed in front of the listening position and loudspeaking a main signal which is an acoustic signal corresponding to the speaker, and A left surround speaker for forming stereophonic sound by loudspeaking a surround signal that is an acoustic signal of the leftward component
- a right surround speaker section for forming a three-dimensional sound by loudspeaking a surround signal, which is the above-described acoustic signal having a rightward component with respect to the listening position, and an integrated surround speaker 133 that is physically formed.
- a frequency correction circuit 204 that adjusts the frequency characteristics of the surround sound signal based on a transfer function for forming a sound image at a predetermined listening position, and the same direction as the adjusted surround signal. At least a part of the adjusted surround signal is added to the main signal of the component, and the calorically calculated main signal is added to the corresponding main speed.
- an addition unit 205 outputs the Saraun Dosupi force corresponding at least part of the surround signals of which the frequency property has been adjusted, the when output.
- the surround sound speaker 133 is eccentric.
- the frequency characteristics of a surround signal having a direction component different from that of the direction are adjusted based on a transfer function for forming a sound image at a predetermined listening position.
- the surround system 100 adds at least a part of the adjusted surround signal to a main signal having the same direction as the adjusted surround signal, and outputs the added main signal to the corresponding main speaker. And outputs at least a part of the surround signal whose frequency characteristic has been adjusted to the corresponding surround speaker.
- the frequency correction circuit 204 uses the transfer function for each of the left and right directional components to generate a frequency for each of the left and right directional component surround signals. It has a configuration for adjusting characteristics.
- the surround system 100 can adjust the frequency characteristics for each of the left and right component surround signals, so that the frequency characteristics can be adjusted in more detail, and a higher level can be achieved. It can create a sound field space that gives a sense of reality.
- the frequency correction circuit 204 uses a head-related function (HRTF) as a transfer function for forming a sound image at a predetermined listening position.
- HRTF head-related function
- the surround system 100 of the present embodiment can adjust the frequency characteristic using the head-related transfer function, and thus creates a sound field space that can provide a more realistic sound field space. be able to.
- the frequency correction circuit 204 has a head-related transfer function (HRTF: HRTF) as a transfer function for forming a sound image at a predetermined listening position in a space.
- HRTF head-related transfer function
- the level ratio between the frequency characteristics at the position where the integrated speaker system 130 is decentered around the listening position and the frequency characteristics at the position where the integrated speaker system 130 is installed around the listening position is determined. It is configured to calculate in advance and adjust the frequency characteristics of the surround signal based on the calculated level ratio.
- the surround system 100 uses the level ratio between the head-related transfer function and the actual transfer function when correcting the frequency characteristics, and thus provides a more realistic sound field. You can get out of the sound field space ⁇ ilj to get the space.
- the surround system 100 of the present embodiment has a configuration in which the addition processing unit 205 multiplies the adjusted surround signal by a predetermined coefficient and adds the multiplied surround signal to the main signal. Then
- the input of the frequency correction circuit 204 is switched by the switching control unit 203 by the switching control unit 203, and one of the surround signals is
- the frequency correction circuit 204 may be provided for each surround signal without using the switching process for switching the input.
- the frequency correction circuit 204 prepares an ideal transfer function and an actual transfer function for each surround signal, calculates the level ratio thereof, and adjusts the frequency characteristics.
- the addition processing unit 205 performs an addition process to the main signal for a surround signal having a direction component different from one of the left and right with respect to the listening position where the integrated surround speaker 133 is installed, and outputs the signal as a surround signal. Processing will be performed.
- the case where the integrated surround speakers 133 are installed on the left and right sides has been described. However, the same applies to the case where the integrated surround speakers 133 are installed diagonally behind. The effect can be exhibited.
- the ideal transfer function and the actual transfer function are prepared in advance, the level ratio is calculated, and the ratio of the addition to the main signal and the ratio of the output of the surround signal in the addition process may be set in advance. .
- the surround system according to the present embodiment differs from the first embodiment in that the frequency characteristics of the selected audio signal are corrected in place of the point that the selected audio signal is corrected in stereo.
- the feature is that wide processing is performed.
- other features of the feature are the same as those of the first embodiment, and the same members are denoted by the same reference numerals and description thereof will be omitted.
- FIG. 6 is a block diagram showing a configuration of the signal processing unit of the present embodiment.
- the signal processing unit 200 includes a decoder 201 that decodes the input audio data into an audio signal for each channel, a DSP processing unit 202 that performs predetermined digital signal processing by a user's operation of the operation unit 124, Under the control of the system control unit 125, the stereo wide processing is performed on each of the surround signals based on one of the surround signals. It comprises a tele-wide processing section 300 and an addition processing section 205 for adding each surround signal subjected to stereo wide processing to the main signal.
- the stereo wide processing unit 300 of the present embodiment constitutes the generating unit, the first arithmetic unit, and the second arithmetic unit of the present invention
- the addition processing unit 205 includes the adding unit of the present invention. Construct the stage and the output means.
- the DSP processing unit 202 receives a decoded audio signal for each channel, and the DSP processing unit 202 controls the operation unit 124 under the control of the system control unit 125. Performs predetermined digital signal processing based on the instruction input from the PC, and outputs the processed audio signal for each channel to the stereo wide processing unit 300, the addition processing unit 205, and the DZA conversion unit. Become.
- the sound field setting (hereinafter, simply referred to as a sound field setting) of a church, a stadium, or a specific hall is performed by the operation unit 124, as in the first embodiment. If this is done, delay processing and frequency characteristic correction processing for each channel, and conversion of audio signals to audio signals of other channels in an arbitrary audio signal so that the input audio data is amplified in the sound field. Digital signal processing such as addition processing is performed.
- the DSP processing unit 202 outputs the surround signal to the stereo wide processing unit 300 and the main signal to the addition processing unit 205, respectively.
- signal processing based on the set position of the integrated surround speaker 133 is performed on the center signal loudspeaked from the center speaker 131 and the woofer signal loudspeaked from the subwoofer. Since it is not necessary, the DSP processor 202 directly outputs the center signal and the woofer signal to the DZA converter 122, respectively.
- the stereo wide processing unit 300 receives a left surround signal to be amplified by the left speaker unit and a right surround signal to be amplified by the right speaker unit. This stereo wide processing unit 300 is Under the control of the control unit 125, the following processing is performed, and each processed surround signal is output to the addition processing unit 205.
- the integrated surround speakers 133 are installed on either side of the listening position, that is, the integrated speakers are unevenly arranged on the left and right around the listening position.
- the stereo wide processing unit 300 Select the surround signal to be amplified on the side different from the side where the is installed, and select the surround signal (hereinafter referred to as the selected surround signal) that differs from the selected surround signal.
- the surround signal is subtracted to generate a difference signal, and the difference signal is filtered and added to or subtracted from each surround signal and output to the addition processing unit 205. That.
- the integrated surround speaker 133 when the integrated surround speaker 133 is installed on the right side with respect to the listening position, that is, when the integrated surround speaker 133 is installed as shown in FIG. Is a selected surround signal, and the left surround signal power is subtracted from the right surround signal to generate a difference signal.
- the signal in which the high-frequency component of the generated difference signal is cut is added to the left surround signal, and the signal in which the high-frequency component of the difference signal is cut is subtracted from the right surround signal. ing.
- the integrated surround speaker 133 is installed behind the listening position.
- the system control unit 125 executes the switching control to the stereo wide processing 300. Therefore, the stereo wide processing unit 300 directly outputs the input surround signals to the addition processing unit 205, respectively.
- the addition processing unit 205 receives each main signal and each stereo wide processed surround signal output from the stereo wide processing unit 300, and under the control of the system control unit 125, Performs addition processing of the main signal and surround signal and output processing of the surround signal! ⁇ Each main signal and each surround signal are output to each DZA converter.
- the integrated surround speaker 133 is installed on the left or right side of the listening position, that is, the integrated speaker is placed in the listening position. Is installed in a position where the left and right are uneven with respect to the center, and when an instruction to that effect is input to the addition processing unit 205 via the system control unit 125, the addition processing unit 205 A predetermined component of the surround signal selected at the time of processing is added to the main signal loudspeaked from the main speaker in the same direction with respect to the listening position, and output to the DZA variable ⁇ corresponding to the main signal. The level of the surround signal that has been subjected to the stereo wide processing is reduced, and the surround signal is output to the DZA converter corresponding to the surround signal.
- the addition processing unit 205 performs stereo wide processing.
- the left surround signal is multiplied by a predetermined coefficient and added to the left main signal to output the left main signal, and the stereo surround processed left surround signal power has a predetermined coefficient.
- the multiplied left surround signal is output as a left surround signal.
- the addition processing unit 205 adds a part of the surround signal subjected to the stereo wide processing to the main signal, and outputs the rest of the surround signal to the DZA converter as the surround signal.
- the addition processing unit 205 performs stereo wide processing on the main signal.
- a signal obtained by multiplying the surround signal subjected to the stereo wide processing by the coefficient (0.3) is output as the surround signal.
- the addition processing unit 205 performs the digital signal processing. Therefore, when adding the surround signal subjected to the stereo wide processing to the main signal, the addition processing unit 205 That is, even if the main signal and the surround signal are added, the value does not exceed 1.0, and the level of each main signal and each surround signal is based on that value. Is to be adjusted. However, when output to each DZA converter, the addition processing unit 205 expands each of the main signal and each of the surround signals to the original signal level and converts the signal level to the original signal level. Is compensated for. In the present embodiment, the adjustment of the signal level of each signal may not be performed by the addition processing unit 205, but may be compensated by each power amplifier 123 via the system control unit 125.
- the system control unit 125 switches to the addition processing unit 205. Since the instruction for executing the control is not output, the addition processing unit 205 directly outputs each of the input surround signals and each of the main signals to each of the DZA variables. .
- the surround system 100 loudspeakers corresponding to the respective audio signals based on the input plurality of audio signals, thereby providing a sense of realism to the listener.
- a signal processing device 120 for providing a certain sound field space, at least a pair of left and right main speakers installed in front of the listening position and loudspeaking a main signal which is an acoustic signal corresponding to the speaker, and
- a left surround speaker unit for forming a three-dimensional sound by loudspeaking a surround signal, which is a leftward component sound signal, and a three-dimensional sound by loudspeaking the surround signal, which is the rightward component acoustic signal with respect to a listening position.
- the right surround speaker for forming sound is formed
- the integrated surround speaker 133 is provided.
- Surround signal force in a direction component different from the eccentric direction The surround signal in the eccentric direction is subtracted to generate a difference signal, and a surround signal having a direction component different from the direction in which the integrated surround speaker 133 is eccentric.
- a stereo that performs arithmetic processing to add the generated differential signal to the surround signal and subtracts the differential signal generated to the surround signal having the same directional component as the direction in which the integrated surround-speech force 133 is eccentric
- the wide processing unit 300 adds at least a part of each processed surround signal to each main signal having the same direction component.
- an addition processing unit 205 that outputs each of the added main signals to the corresponding main speakers, and outputs at least a part of each of the surround signals on which the difference signal has been processed to the corresponding surround speakers. , Are provided.
- the surround sound system 100 of the present embodiment is configured such that when the integrated surround-speech force 133 is installed at a position unequal to the left and right around the listening position, the surround sound speaker 133 is eccentric.
- a difference signal is generated based on the surround signals of the left and right direction components with respect to the surround signal of the direction component different from the generated direction, and the generated difference signal is added to or subtracted from each surround signal.
- the surround system 100 adds at least a part of the arithmetically processed surround signal to a main signal having the same direction as the surround signal to which the differential signal has been added, and applies the added main signal to the corresponding main signal. And at least a part of each surround signal to which the difference signal has been added or subtracted is output to the corresponding surround speaker.
- the surround system of the present embodiment differs from the first embodiment in that the reverberation component is added to the selected audio signal instead of performing the frequency characteristic correction on the selected audio signal. There is a characteristic in that it is performed.
- other configurations of the feature points are the same as those of the first embodiment, and the same members are denoted by the same reference numerals and description thereof will be omitted.
- FIG. 7 is a block diagram illustrating a configuration of the signal processing unit according to the present embodiment.
- the signal processing unit 200 decodes the input audio data into an audio signal for each channel, and a DSP processing unit 202 that performs predetermined digital signal processing by operating the operation unit 124 by the user.
- a switching control unit 203 for selecting one of the left and right surround signals amplified by the surround speakers, and a surround signal selected by the switching control unit 203. It comprises a reverberation filter circuit 400 for adding a reverberation component, and an addition processing unit 205 for adding the reverberation-added surround signal to a DSP-processed main signal.
- the switching control unit 203 and the reverberation filter circuit 400 of the present embodiment constitute the generating means and the arithmetic means of the present invention
- the addition processing unit 205 includes the adding means and the output of the present invention. Configure means.
- the switching control unit 203 is configured to receive a left surround signal to be amplified by the left speaker unit and a right surround signal to be amplified by the right speaker unit. Under the control of the system control unit 125, the switching control unit 203 outputs one of the input left and right surround signals to the reverberation caro circuit 400 and does not output the signal to the reverberation adding circuit 400. The surround signal is output to the addition processing unit 205.
- the integrated surround speakers 133 are installed on either side of the listening position, that is, the integrated speakers are unevenly arranged on the left and right with respect to the listening position. Is installed in a different location, and an instruction to that effect is issued to the system control unit. 5, the switching control section 203 reverberates a surround signal for loudspeaking on a side different from the side where the integrated surround speaker 133 is installed. An output is provided to the attached kana circuit 400. In this case, the switching control unit 203 outputs a surround signal for loudspeaking at the side where the integrated surround speaker 133 is installed, to the addition processing unit 205 directly.
- the switching control unit 203 outputs the left surround signal. Is output to the reverberation adding circuit 400, and the right surround signal is output to the addition processing unit 205.
- the system control unit 125 does not output an instruction for executing the switching control to the switching control unit 203.
- Each of the input surround signals is directly output to the addition processing unit 205.
- One of the surround signals is input to the reverberation filter 400, and the reverberation filter 400 internally performs a predetermined delay process.
- the delay-processed surround signal is output to the addition processing unit 205.
- the reverberation adding circuit 400 attenuates the amplitude level of the input surround signal every delay time of number (m'sec) x 10-1-number (m'sec) x 10
- the generated signal is generated, and the generated signal is added to the original signal, that is, the input surround signal.
- the reverberation adding circuit 400 when the integrated surround speaker 133 is installed on the right side of the listening position, that is, when it is installed as shown in FIG. Since the input signal is input, the reverberation adding circuit 400 generates a signal in which the surround signal for the left exponentially attenuates at a constant delay time, and adds each generated signal to the surround signal for the left. The data is output to the addition processing unit 205.
- each of the main signals and the switching control unit 203 The output surround signal and the surround signal to which reverberation is added are input. Under the control of the system control unit 125, the main signal and the surround signal are added and the surround signal is output. Each main signal and each surround signal are output to each DZA converter.
- the addition processing unit 205 loudspeakers a predetermined component of the surround signal to which reverberation has been added from a main speaker in the same direction as the listening position.
- the DZA transform corresponding to the main signal and output the DZA transform corresponding to the surround signal by lowering the level of the surround signal to which the reverberation is added. Has become.
- the addition processing unit 205 multiplies the left surround signal by a predetermined coefficient, adds the left surround signal to the left main signal, outputs the left main signal, and outputs the left surround signal.
- the power is also such that the left surround signal multiplied by a predetermined coefficient is output as a left surround signal.
- the addition processing unit 205 adds a part of the surround signal subjected to the reverberation processing to the main signal, and outputs the remainder of the surround signal to the DZA converter as the surround signal! /
- the addition processing unit 205 of the present embodiment performs digital signal processing, so that when adding a surround signal to which reverberation has been added to a main signal, It is necessary to normalize each main signal and surround signal, that is, even if the main signal and the surround signal are added, the value does not exceed 1.0, and each main signal and the surround signal are based on that value. And the level of each surround signal is adjusted! However, when output to each DZA converter, the addition processing unit 205 expands the normalized signal level of each main signal and each surround signal to the original signal level to compensate for the signal level. It is supposed to. Further, in the present embodiment, the adjustment of the signal level of each signal may not be performed by the addition processing unit 205, but may be compensated by each power amplifier 123 via the system control unit 125. .
- the system control unit 125 switches to the addition processing unit 205. Since the instruction for executing the control is not output, the addition processing unit 205 directly outputs each of the input surround signals and each of the main signals to each of the DZA variables. .
- the surround system 100 loudspeakers corresponding to the respective audio signals based on the plurality of input audio signals to provide a sense of realism to the listener.
- a signal processing device 120 for providing a certain sound field space, at least a pair of left and right main speakers installed in front of the listening position and loudspeaking a main signal which is an acoustic signal corresponding to the speaker, and
- a left surround speaker unit for forming a three-dimensional sound by loudspeaking a surround signal which is a left-direction component sound signal and a three-dimensional sound by loudspeaking the surround signal which is the right-direction component sound signal with respect to a listening position.
- a right surround speaker section for forming sound for forming sound; and an integrated surround speaker 133 formed integrally with the right surround speaker section.
- the built-in surround speaker 133 is installed at a position that is unequal to the left and right with respect to the listening position, a predetermined surround sound signal having a direction component different from the direction in which the integrated surround speaker 133 is decentered is set.
- an addition processing unit 205 that outputs the added main signal to the corresponding main speaker and outputs at least a part of the reverberanted surround signal to the corresponding surround speaker.
- the surround sound speaker 133 is eccentric.
- the reverberation is added to the surround signal of the directional component different from the directional component.
- the surround system 100 adds at least a part of the arithmetically processed surround signal to a main signal having the same direction as that of the surround signal to which reverberation is added, and outputs the added main signal. Output to the corresponding main speaker and at least a part of the surround signal with reverberation added to the corresponding surround speaker.
- the surround system according to the present embodiment differs from the first embodiment in that reverberation-added stereo wide processing is performed on a selected audio signal instead of performing frequency characteristic correction on the selected audio signal.
- reverberation-added stereo wide processing is performed on a selected audio signal instead of performing frequency characteristic correction on the selected audio signal.
- other configurations of the characteristic points are the same as those of the first embodiment, and the same members are denoted by the same reference numerals and description thereof is omitted.
- FIG. 8 is a block diagram illustrating a configuration of the signal processing unit of the present embodiment.
- the signal processing unit 200 converts the input audio data into audio data for each channel.
- a decoder 201 for decoding into a signal
- a DSP processing unit 202 for performing predetermined digital signal processing by a user's operation of the operation unit 124, and a surround signal based on one of the surround signals under the control of the system control unit 125. It comprises a reverberation-added stereo-wide processing section 500 for performing reverberation-added stereo-wide processing on a signal, and an addition processing section 205 for adding each surround signal subjected to the reverberation-added stereo-wide processing to the main signal.
- the reverberation-added stereo wide processing unit 500 of the present embodiment constitutes the generating unit, the first computing unit, and the second computing unit of the present invention, and the addition processing unit 205 corresponds to the present invention. And an output means.
- the reverberation-added stereo wide processing unit 500 receives a left surround signal to be amplified by the left speaker unit and a right surround signal to be amplified by the right speaker unit.
- the reverberation-added stereo wide processing section 500 performs the following processing under the control of the system control section 125, and outputs each processed surround signal to the addition processing section 205.
- the generated delay component is also subtracted from the selected surround signal power and output.
- the integrated surround speakers 133 are installed on either side of the listening position, that is, the integrated speakers are unevenly arranged on the left and right around the listening position.
- the reverberation adding stereo wide processing unit 500 Select a surround signal for loudspeaking at a side different from the side where the body surround speaker 133 is installed, and select the selected surround sound.
- a surround signal different from the selected surround signal is subtracted from the selected surround signal (hereinafter, referred to as a selected surround signal) to generate a differential signal, and the differential signal is filtered.
- the reverberation-added stereo wide processing unit 500 is provided for the left side when the integrated surround speaker 133 is installed on the right side of the listening position, that is, when the integrated surround speaker 133 is installed as shown in FIG.
- the surround signal is used as a selected surround signal, and the difference signal is generated by subtracting the left surround signal power and the right surround signal.
- an exponentially attenuating signal is to be generated for each fixed delay time with respect to the signal from which the high-frequency component of the generated difference signal has been cut.
- the delayed signal is alternately added to the left surround signal in the time series, and the delayed signal is subtracted from the right surround signal power.
- the system control unit 125 does not output an instruction to execute the switching control to the reverberation-added stereo wide processing unit 500.
- the unit 500 outputs each of the input surround signals directly to the addition processing unit 205.
- Each of the main signals and the surround signal subjected to the reverberation-added stereo wide processing output from the reverberation-added stereo wide processing unit 500 are input to the addition processing unit 205. Under the control, the main signal and the surround signal are added and the surround signal is output, and each main signal and each surround signal are output to each DZA conversion.
- the integrated surround speaker 133 is installed on either side of the listening position, that is, the integrated speaker is placed in the listening position. Is installed in a position where the left and right are uneven with respect to the center.
- the addition processing unit 205 places a predetermined component of the surround signal selected during the reverberation-added stereo wide processing at the listening position.
- the signal is added to the main signal loudspeaked from the main speaker in the same direction and output to the DZA converter corresponding to the main signal. It outputs to the DZA converter corresponding to the surround signal.
- addition processing section 205 performs reverberation-added stereo wide processing.
- the obtained left surround signal is multiplied by a predetermined coefficient, and is added to the left main signal to output the left main signal.
- the left surround signal multiplied by the coefficient is output as a left surround signal.
- the addition processing unit 205 adds a part of the surround signal subjected to the reverberation-added stereo wide processing to the main signal, and outputs the remainder of the surround signal to the DZA transformer as the surround signal. Become.
- the addition processing unit 205 A signal obtained by multiplying the surround signal subjected to the reverberation-added stereo wide processing by a coefficient (0.7) is added to the main signal, and the surround signal subjected to the reverberation-added stereo wide processing is subjected to a coefficient ( 0.3) is multiplied and output!
- the addition processing unit 205 of the present embodiment performs digital signal processing, so that when adding a reverberation-added stereo wide processed surround signal to a main signal, It is necessary to normalize each of the main signal and the surround signal, that is, even if the main signal and the surround signal are added, the value does not exceed 1.0.
- the level of the main signal and each surround signal is adjusted.
- each main signal and each surround signal converts the normalized signal level to the original signal level. It expands and compensates for the signal level.
- the adjustment of the signal level of each signal may not be performed by the addition processing unit 205, but may be compensated by each power amplifier 123 via the system control unit 125.
- system control unit 125 switches to addition processing unit 205. Since the instruction for executing the control is not output, the addition processing unit 205 outputs each of the input surround signals and each of the main signals directly to each of the DZA transformers.
- the surround system 100 of the present embodiment loudspeakers corresponding to each of the input audio signals based on the input audio signals to provide the listener with a sense of realism.
- a signal processing device 120 for providing a certain sound field space, at least a pair of left and right main speakers installed in front of the listening position and loudspeaking a main signal which is an acoustic signal corresponding to the speaker, and
- a left surround speaker unit for forming a three-dimensional sound by loudspeaking a surround signal which is a left-direction component sound signal and a three-dimensional sound by loudspeaking the surround signal which is the right-direction component sound signal with respect to a listening position.
- the integrated surround speaker When the integrated surround speaker is installed at a position that is unequal to the left and right with respect to the listening position, a surround signal force having a direction component different from the direction in which the integrated surround speaker is eccentric.
- the difference signal is generated by subtracting the surround signal of the integrated surround speaker 133, and a delay component is generated with respect to the generated difference signal.
- Reverberation-added stereo wide processing that performs arithmetic processing to calculate the calorific value of the component and performs arithmetic processing to subtract the delay component generated from the surround signal having the same directional component as the direction in which the integrated surround speaker 133 is decentered.
- the addition processing section 20 outputs the calculated main signals to the corresponding main speakers, and outputs at least a part of each of the surround signals subjected to the delay component arithmetic processing to the corresponding surround speakers. 5).
- the surround-type surround speaker 133 of the present embodiment is eccentric.
- a difference signal is generated based on the surround signals of the left and right direction components for a surround signal having a direction component different from the generated direction signal, a delay component is generated for the generated difference signal, and the generated delay component is generated.
- This surround system 100 adds at least a part of the arithmetically processed surround signal to a main signal having the same direction as the surround signal to which the delay component is added, and applies the added main signal to the main signal. In addition to outputting the main speed, at least a part of each surround signal to which the delay component has been added or subtracted is output to the corresponding surround speaker.
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Abstract
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Priority Applications (2)
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JP2006510934A JP4150749B2 (ja) | 2004-03-16 | 2005-03-08 | 立体音響再生システムおよび立体音響再生装置 |
US10/593,086 US7697695B2 (en) | 2004-03-16 | 2005-03-08 | Stereophonic sound reproducing system and stereophonic sound reproducing apparatus |
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JP2007134943A (ja) * | 2005-11-10 | 2007-05-31 | Funai Electric Co Ltd | オーディオシステム |
US8542854B2 (en) | 2010-03-04 | 2013-09-24 | Logitech Europe, S.A. | Virtual surround for loudspeakers with increased constant directivity |
US9264813B2 (en) | 2010-03-04 | 2016-02-16 | Logitech, Europe S.A. | Virtual surround for loudspeakers with increased constant directivity |
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US8126151B2 (en) * | 2007-11-07 | 2012-02-28 | Semiconductor Components Industries, Llc | Audio signal processing circuit |
JP5387478B2 (ja) * | 2010-03-29 | 2014-01-15 | ソニー株式会社 | 音声再生装置及び音声再生方法 |
BR112013028684B1 (pt) * | 2011-05-12 | 2021-08-24 | Koninklijke Philips N.V. | Dispositivo que provê alarme de despertar, e método para prover um sinal de despertar audível durante um período de alerta |
CN104380762A (zh) * | 2012-06-29 | 2015-02-25 | 索尼公司 | 视听装置 |
CN105719682A (zh) * | 2016-01-15 | 2016-06-29 | 珠海格力电器股份有限公司 | 一种立体音录制回放的方法及*** |
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JP2001157294A (ja) * | 1999-11-30 | 2001-06-08 | Aiwa Co Ltd | センターユニット及びホームシアター用スピーカシステム |
JP2003134598A (ja) * | 2001-10-26 | 2003-05-09 | Victor Co Of Japan Ltd | サラウンド信号処理方法 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007134943A (ja) * | 2005-11-10 | 2007-05-31 | Funai Electric Co Ltd | オーディオシステム |
US8542854B2 (en) | 2010-03-04 | 2013-09-24 | Logitech Europe, S.A. | Virtual surround for loudspeakers with increased constant directivity |
US9264813B2 (en) | 2010-03-04 | 2016-02-16 | Logitech, Europe S.A. | Virtual surround for loudspeakers with increased constant directivity |
Also Published As
Publication number | Publication date |
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JP4150749B2 (ja) | 2008-09-17 |
JPWO2005089018A1 (ja) | 2008-01-31 |
US7697695B2 (en) | 2010-04-13 |
US20070211904A1 (en) | 2007-09-13 |
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