JP2010093403A - Acoustic reproduction system, acoustic reproduction apparatus, and acoustic reproduction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily achieve excellent acoustic reproduction characteristics without requesting huge labor or high-grade ability relating to acoustic adjustment to the user of an acoustic reproduction apparatus. <P>SOLUTION: Acoustic characteristic data confirmed and preserved beforehand are read from the acoustic data preservation parts 11 and 21 of the acoustic reproduction apparatuses 1 and 2 connected to each other with a data cable 3, and the two pieces of acoustic characteristic data are transferred to a parameter calculation part 13 provided in the first acoustic reproduction apparatus 1. Then, an acoustic adjustment parameter (a crossover frequency, a volume adjustment value and a delay adjustment value) for the two acoustic reproduction apparatuses is calculated in a parameter calculation part 13, and the acoustic characteristics are converted in an acoustic characteristic conversion part 15 for acoustic signals inputted from an acoustic signal input part 14 according to the parameter value. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention provides a sound reproduction system, a sound reproduction device, and a sound reproduction that can adjust and reproduce a plurality of sound reproduction devices as one sound reproduction device by utilizing a communication function between connected devices in order to improve sound reproduction characteristics. It is about the method.

  There is Patent Literature 1 as a conventional sound reproducing device utilizing a communication function between connected devices. In this method, a television and a plurality of speaker-equipped devices are connected through a communication I / F, and sound is reproduced so that reproduction synchronization can be established between the speakers based on information on each speaker. With the technique disclosed in Patent Document 1, since the speakers of a plurality of audio devices can be played back synchronously by utilizing the communication function between connected devices, multi-channel playback is possible with a combination of 1 to 2ch playback devices. Yes.

  Moreover, there is Patent Document 2 as a conventional technique that can easily adjust the acoustic characteristic parameter of the acoustic reproduction system. In the technique disclosed in Patent Document 2, it is possible to adjust the acoustic characteristics with high accuracy for each of a plurality of speakers by a volume adjusting unit, a frequency characteristic control unit, a phase control unit, or the like.

Furthermore, Patent Document 3 discloses a conventional technique that can easily adjust an acoustic characteristic by reproducing a measurement signal for measuring an acoustic characteristic in a sound field space where an acoustic reproduction system is installed and analyzing the measurement signal. is there. In the technique disclosed in Patent Document 3, pink noise reproduced from a speaker is collected by a microphone, level correction data for each frequency band is obtained from the collected sound, and an acoustic characteristic parameter is calculated from the level correction data. The acoustic characteristics can be adjusted.
JP 2005-217559 A JP-A-6-22388 JP 2007-189317 A

  The technique disclosed in Patent Document 1 can reproduce a speaker of a plurality of audio devices in synchronization by utilizing a communication function between connected devices, so that multi-channel reproduction can be performed by combining 1 to 2ch reproducing devices. However, there is a problem that it is not possible to expect an improvement in the reproduction acoustic characteristics by simply reproducing at the same time, and the acoustic reproduction characteristics may deteriorate due to mutual interference.

  Next, the technique disclosed in Patent Document 2 has a configuration in which the volume, frequency characteristics, and phase characteristics can be adjusted for each of a plurality of speakers having different reproduction bands. However, the adjustment parameters to be set in each of the above-described configurations for adjusting the acoustic characteristics must be determined by the adjustment operator based on the actual audibility. There is a problem that a high level of labor and a high level of sound adjustment are required.

  The technique disclosed in Patent Document 3 adjusts acoustic characteristics based on the result of sound field measurement. FIG. 13 is a block diagram showing a functional configuration of the technique disclosed in Patent Document 3. As shown in FIG.

  In FIG. 13, 41 is a microphone, 42 is an acoustic characteristic measurement unit including a microphone amplifier, an AD converter, and a signal processing unit, 43 is an adjustment condition calculation unit that calculates an acoustic adjustment condition from measurement data, 44 is an acoustic signal input unit, Reference numeral 45 denotes an acoustic characteristic conversion unit including a parametric equalizer, 46 denotes a system control unit, 47 denotes a speaker, 48 denotes a power amplifier, and 49 denotes an acoustic reproduction unit including the speaker 47, the power amplifier 48, and a DA converter.

  In the configuration of FIG. 13, the measurement signal is input from the acoustic signal input unit 44 and is reproduced from the acoustic reproduction device 49 into the sound field space via the speaker 47 and the power amplifier 48. The sound field response of the reproduction output is collected by the microphone 41 and analyzed as measurement result data in an acoustic characteristic measurement unit 42 including a microphone amplifier, an AD converter, a signal processing unit, and the like.

  Further, an adjustment condition for adjusting the acoustic characteristics based on the analyzed measurement data is calculated in the adjustment condition calculation unit 43. Then, based on the calculation condition, the acoustic characteristics of the audio signal input from the acoustic signal input unit 44 are converted by the acoustic characteristic conversion unit 45. Note that the measurement of the acoustic characteristics and the calculation of the subsequent adjustment conditions are performed for each of the plurality of sound reproducing devices 49 including the speaker 47 and the power amplifier 48. With the above configuration, it is possible to adjust the sound for each of the plurality of sound playback devices 49 in consideration of the sound field characteristics in which the sound playback system is used, and the sound characteristics are improved.

  Since the calculation of the acoustic adjustment condition is based on the sound field measurement result, unlike Patent Document 2, the operator does not require a special ability and man-hour related to the acoustic adjustment for calculating the acoustic condition. However, in the technique of Patent Document 3, since the acoustic adjustment condition is calculated based on the sound field measurement result as described above, naturally, the calculated acoustic adjustment condition is not appropriate unless correct acoustic measurement is performed. . In general, acoustic measurement results vary depending on the microphone installation position and background noise conditions during measurement, and the measured results have sufficient accuracy to calculate the appropriate acoustic adjustment conditions. In order to determine whether or not there is, the operator is required to have an advanced ability equivalent to performing acoustic adjustment.

  Therefore, the present invention calculates an acoustic adjustment condition based on an appropriate acoustic characteristic that has been confirmed in advance without requiring a great deal of labor and advanced ability from the user of the acoustic reproduction device, and based on the acoustic adjustment condition. An object of the present invention is to provide an acoustic system having good acoustic reproduction characteristics by adjusting and reproducing a plurality of acoustic reproduction apparatuses.

  In order to achieve the above object, the sound reproduction system of the present invention includes a first sound reproduction device including a first speaker and a second sound reproduction device including a second speaker, and the first speaker; An acoustic reproduction system for performing multiway reproduction in combination with the second speaker, wherein the first acoustic reproduction device includes first reproduction band data indicating a reproduction band of the first speaker. A first data storage unit that stores first data, an acoustic signal input unit that inputs an acoustic signal, and a characteristic of an acoustic signal from the acoustic signal input unit that is converted and supplied to the first speaker An acoustic characteristic conversion unit that generates the first acoustic signal and a second acoustic signal to be supplied to the second speaker, and a parameter for converting the characteristic of the acoustic signal by the acoustic characteristic conversion unit Do A parameter calculation unit and a first data communication unit for performing data communication with the second acoustic device, wherein the second acoustic reproduction device indicates a reproduction band of the second speaker. A second data storage unit for storing second data including second reproduction band data, and a second data communication unit for performing data communication with the first acoustic device, The first speaker inputs and reproduces the first acoustic signal generated by the acoustic characteristic converter, and the second speaker receives the second acoustic signal generated by the acoustic characteristic converter. The parameter calculation unit inputs the first data from the first data storage unit, the second data communication unit inputs the first data from the first data communication unit, and the second data communication unit. From the data storage unit to the second data communication unit and the previous The second data is input via the first data communication unit, the first reproduction band data included in the input first data, and the second data included in the input second data. The crossover frequency for multiway reproduction is obtained based on the reproduction band data of the first and second reproduction outputs of the first speaker and the second speaker so as to cross over at the crossover frequency. The acoustic characteristic conversion unit calculates the parameter for converting the frequency characteristic of the acoustic signal.

  In addition, the parameter calculation unit may be one of the reproduction band of the first speaker included in the first reproduction band data and the reproduction band of the second speaker included in the second reproduction band data. The vicinity of the limit frequency of the reproduction band is obtained as the crossover frequency.

  The first data further includes first reproduction efficiency data indicating reproduction efficiency of the first speaker, and the second data further includes first reproduction efficiency data indicating the reproduction efficiency of the second speaker. And the parameter calculation unit includes the first reproduction efficiency data included in the input first data and the second reproduction efficiency data included in the input second data. Based on the above, the acoustic characteristic conversion unit adjusts the characteristic of the acoustic signal so as to compensate for the difference between the reproduction output level of the first speaker and the reproduction output level of the second speaker before and after the crossover frequency. The parameter for conversion is calculated.

  Further, the first data further includes first delay amount data indicating a delay amount of the first speaker, and the second data further includes a first delay amount indicating the delay amount of the second speaker. 2, the parameter calculation unit obtains the first delay amount data included in the input first data and the second delay amount data included in the input second data. Based on this, the acoustic characteristic conversion unit calculates the parameter for converting the characteristic of the acoustic signal so as to compensate for the difference between the delay amount of the first speaker and the delay amount of the second speaker. It is characterized by.

  In addition, the sound reproducing device of the present invention includes a second speaker and a second data storage unit and a second data communication unit that store second reproduction band data indicating a reproduction band of the second speaker. A sound reproduction device for performing multiway reproduction in combination with the second sound reproduction device, wherein the first data includes a first speaker and first reproduction band data indicating a reproduction band of the first speaker. A first data storage unit for storing the sound signal, a sound signal input unit for inputting the sound signal, and a first signal for converting the characteristics of the sound signal from the sound signal input unit and supplying the converted characteristics to the first speaker An acoustic characteristic conversion unit that generates an acoustic signal and a second acoustic signal to be supplied to the second speaker, and a parameter calculation that calculates a parameter for converting the characteristic of the acoustic signal by the acoustic characteristic conversion unit And a first data communication unit for performing data communication with the second acoustic device, wherein the first speaker generates the first acoustic signal generated by the acoustic characteristic conversion unit. The second speaker inputs the second acoustic signal generated by the acoustic characteristic conversion unit via the first data communication unit and the second data communication unit. And the parameter calculation unit inputs the first data from the first data storage unit, and the second data communication unit and the first data communication unit from the second data storage unit. The second data is input via the first reproduction band data included in the input first data and the second reproduction band data included in the input second data. Based on multi-way playback A frequency is obtained, and the acoustic characteristic converter converts the frequency characteristic of the acoustic signal so that the reproduction output of the first speaker and the reproduction output of the second speaker cross over at the crossover frequency. The parameter is calculated.

  The sound reproduction system of the present invention includes a first sound reproduction device including a first speaker and a second sound reproduction device including a second speaker, and the first speaker, the second speaker, and the like. Is a sound reproduction system for performing surround reproduction, wherein the first sound reproduction device has a first head transmission indicating a transmission characteristic from the first speaker to the left and right ears at a predetermined viewing position. A first data storage unit for storing function data, an acoustic signal input unit for inputting an acoustic signal, and a first unit for converting characteristics of the acoustic signal from the acoustic signal input unit and supplying the converted characteristics to the first speaker An acoustic characteristic converter that generates one acoustic signal and a second acoustic signal to be supplied to the second speaker, and a parameter for converting the characteristic of the acoustic signal by the acoustic characteristic converter. A parameter calculation unit and a first data communication unit for performing data communication with the second audio device, wherein the second sound reproduction device receives the predetermined viewing from the second speaker. Second data communication for performing data communication between the second data storage unit that stores the second head-related transfer function data indicating the transfer characteristics to the left and right ears at the position, and the first acoustic device The first speaker receives and reproduces the first acoustic signal generated by the acoustic characteristic converter, and the second speaker generates the first speaker generated by the acoustic characteristic converter. 2 acoustic signals are input and reproduced via the first data communication unit and the second data communication unit, and the parameter calculation unit is configured to input the first sound signal input from the first data storage unit. Head-related transfer function data and the second data The acoustic image is localized at an arbitrary virtual sound source position based on the first head-related transfer function data input from the existing unit via the second data communication unit and the first data communication unit. The characteristic conversion unit calculates the parameter for converting the characteristic of the acoustic signal.

  In addition, the sound reproducing device of the present invention stores the second speaker and second head transfer function data indicating transfer characteristics from the second speaker to the left and right ears at the predetermined viewing position. A sound reproduction device for performing surround reproduction in combination with a second sound reproduction device including a first data communication unit and a second data communication unit, wherein the first speaker and the left and right at a predetermined viewing position from the first speaker A first data storage unit that stores first head-related transfer function data indicating transfer characteristics up to the ear, an acoustic signal input unit that inputs an acoustic signal, and a characteristic of the acoustic signal from the acoustic signal input unit is converted An acoustic characteristic converter that generates a first acoustic signal to be supplied to the first speaker and a second acoustic signal to be supplied to the second speaker; and A parameter calculation unit that calculates a parameter for converting a characteristic of the reverberation signal, and a first data communication unit for performing data communication with the second acoustic device, wherein the first speaker is The first acoustic signal generated by the acoustic characteristic conversion unit is input and reproduced, and the second speaker converts the second acoustic signal generated by the acoustic characteristic conversion unit into the first data. The parameter calculation unit inputs the first head-related transfer function data input from the first data storage unit, the second data transfer unit, and the second data communication unit. Based on the first head-related transfer function data input from the data storage unit via the second data communication unit and the first data communication unit, the sound image is localized at an arbitrary virtual sound source position. The acoustic characteristic converter is connected to the acoustic signal. It is characterized in that to calculate the parameters for converting characteristics.

  According to the sound reproduction system and the sound reproduction method of the present invention, parameters are calculated on the basis of appropriate acoustic characteristics confirmed in advance without requiring a great deal of effort and advanced ability from the user of the sound reproduction device, An acoustic system having good acoustic reproduction characteristics can be provided by converting and reproducing characteristics of acoustic signals supplied to a plurality of acoustic reproduction apparatuses based on the parameters.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing a functional configuration of the sound reproduction system according to Embodiment 1 of the present invention. In FIG. 1, 1 is a first sound reproduction device, 2 is a second sound reproduction device, 11 and 21 are sound data storage units, 12 and 22 are data communication units, 3 is a data cable, 13 is a parameter calculation unit, 14 is an acoustic signal input unit, 15 is an acoustic characteristic conversion unit, 16 and 26 are system control units, 17 and 27 are speakers, 18 and 28 are power amplifiers, and 19 and 29 are sound reproduction units.

  FIG. 2 is a schematic diagram assuming an actual viewing mode of the sound reproduction system and the user in the first embodiment of the present invention. In FIG. 2, 4 is a floor-mounted speaker system, 5 is a thin television with a built-in speaker system, and 6 is a data cable.

  Furthermore, FIG. 3 is a flowchart showing an operation flow of the sound reproduction system according to Embodiment 1 of the present invention.

  Hereinafter, the operation of the sound reproduction system according to Embodiment 1 of the present invention will be described.

  First, a viewing mode actually assumed in the present embodiment will be described with reference to FIG. As shown in FIG. 2, a floor-mounted speaker system 4 as a first sound reproduction device and a thin television 5 incorporating a speaker system as a second sound reproduction device are connected via a data cable 6. . The thin TV 5 with a built-in speaker system is installed on a wall or a stand, and the height of the built-in speaker from the floor is in the vicinity of the height of the ears of the viewer. It will be installed at a position higher than the type speaker system 4.

  Under such installation conditions, the viewer hears sound reproduced with acoustic characteristics adjusted by a method described later from both the floor-mounted speaker system 4 and the flat-screen television 5 incorporating the speaker system.

  Next, the operation in Embodiment 1 of the present invention will be described with reference to FIG.

  In the present embodiment, the acoustic characteristics are improved by combining and reproducing a plurality of acoustic reproduction apparatuses having different acoustic characteristics. As data necessary for this, data relating to acoustic characteristics measured by a predetermined measurement method is stored in the acoustic data storage units 11 and 21.

  FIG. 4 is an example of acoustic characteristic data stored in the acoustic data storage unit 11 of the first sound reproducing device 1. FIG. 5 is an example of acoustic characteristic data stored in the acoustic data storage unit 21 of the second acoustic reproduction device 2. The acoustic characteristic data stored in the respective acoustic data storage units 11 and 21 is obtained by measuring the acoustic transfer characteristics at the position of the viewer in advance under the installation conditions of the respective acoustic reproduction devices as shown in FIG.

  4A and 5A are amplitude frequency characteristics of the acoustic transfer characteristics, and FIGS. 4B and 5B are impulse responses of the same acoustic transfer characteristics. The tendency of the sound transfer characteristic that can be read by comparing FIG. 4 and FIG. 5 is that the sound transfer characteristic of FIG. 4 assuming the floor-mounted speaker system 4 in FIG. However, the sound output reproduction efficiency is lower than that of the sound transmission characteristic of FIG. 5 assuming the speaker of the flat-screen TV 5 in FIG. 2, and the sound propagation distance to the viewer is short, but the sound reproduction is more than that. The amount of delay due to the processing time of the electric circuit inside the apparatus is large.

  Therefore, it can be seen that when the two sound reproducing apparatuses having the sound transfer characteristics shown in FIGS. 4 and 5 are combined and reproduced, the adjustment should be made while paying attention to the above-mentioned acoustic characteristics.

  Therefore, at least one of the data of (a) or (b) of FIG. 4 and FIG. 5 is stored in the respective acoustic data storage units 11 and 21 of the first acoustic reproduction device 1 and the second acoustic reproduction device 2. It is assumed that

  Note that the acoustic characteristics data stored in the acoustic data storage units 11 and 21 are the acoustic characteristics described later even if each data of the low frequency reproduction limit frequency, the acoustic output reproduction efficiency, and the processing delay amount of each acoustic reproduction device is stored. Since adjustment parameter calculation for improvement is possible, it is acceptable.

  As described above, the following processing for improving acoustic characteristics is executed on the premise that acoustic characteristic data measured under predetermined conditions is stored in each acoustic reproduction device.

  In the following, description will be given of the operation of adjusting the acoustic characteristics while simultaneously referring to the steps shown in FIG.

  First, when the first sound reproduction device 1 and the second sound reproduction device 2 are connected by the data cable 3 and the respective power supplies are turned on, the devices are authenticated between the connected sound reproduction device 1 and the sound reproduction device 2. (Step 31).

  As data to be communicated by the data communication units 12 and 22 in this embodiment, there are acoustic characteristic data and acoustic signal data as will be described later. As a specific realization means, HDMI capable of superimposing a video signal is used as a communication protocol. I will decide. For this purpose, the communication data interface and the data cable 3 constituting the data communication units 12 and 22 are compliant with the HDMI standard.

  Of course, in order to realize the configuration of the present embodiment and its effects, it is not always necessary to transmit the acoustic characteristic data and the acoustic signal data by a single communication protocol. The data communication may be performed by using the data communication units 12 and 22 and the data cable 3 which are configured by communication data interfaces corresponding to the respective data transmitted by individual communication protocols.

  When the authentication between the connected devices is completed, it is checked whether the acoustic characteristic data can be communicated between the connected devices (Step 32).

  In Step 32, if the acoustic characteristic data cannot be communicated, it is impossible to adjust the acoustic characteristic between the connected devices, so the operation of the present embodiment ends here.

  In Step 32, if the acoustic characteristic data can be communicated, an operation of reading the acoustic characteristic data is performed (Step 33).

  As a specific operation in Step 33, in FIG. 1, from the sound data storage units 11 and 21 in the first sound reproduction device 1 and the second sound reproduction device 2, respectively, the respective system control units 16 and 26 are performed. In accordance with the control, the acoustic characteristic data is read out, and in the first sound reproduction device 1 via the data bus inside the device, in the second sound reproduction device 2, the data bus and the data communication unit inside the sound reproduction device 2 Further, two acoustic characteristic data are transferred to the parameter calculation unit 13 in the first sound reproduction device 1 via the data communication unit 12 and the data bus in the sound reproduction device 1.

  Next, the parameter calculation unit 13 calculates sound adjustment parameters for the two sound reproducing devices.

  As a specific method for determining the sound adjustment parameter, first, the low frequency reproduction limit frequency of the sound reproducing device 2 shown in FIG. 5 is around 400 Hz. And play it. Further, when the reproduction efficiency of the sound output of the two sound reproducing devices is compared in FIG. 4A and FIG. 5A, the first sound reproducing device 1 is 15 dB lower, so the volume adjustment is performed to compensate for this. . Further, when the processing delay amounts of the sound outputs of the two sound reproducing devices are compared in FIGS. 4B and 5B, the second sound reproducing device 2 is small by 0.75 msec, so that the delay is sufficient to compensate for this. Also make adjustments. The sound adjustment parameters are set for each of the first sound reproduction device 1 and the second sound reproduction device 2, and in this embodiment, the sound reproduced from the first sound reproduction device 1 is used. The signal is subjected to a low-pass filter up to 400 Hz and a volume amplification process of 15 dB. The sound signal reproduced from the second sound reproduction device 2 is subjected to a high-pass filter of 400 Hz or higher and a delay process of 0.75 msec. Will be.

  Through the above operation, the crossover frequency, the volume adjustment value, and the delay adjustment value are created as the acoustic adjustment parameters (Step 34), and the acoustic characteristic conversion unit is applied to the acoustic signal input from the acoustic signal input unit 14 according to the parameter values. The acoustic adjustment parameter is set in the acoustic characteristic conversion unit 15 so that the acoustic characteristic is converted in Step 15 (Step 35).

  Further, in the acoustic characteristic conversion unit 15, the transmission path of the acoustic signal after the acoustic characteristic conversion is set for each of the acoustic reproduction unit 19 of the first acoustic reproduction device 1 and the acoustic reproduction unit 29 of the second acoustic reproduction device 2. (Step 36).

  When the operation so far is completed, the preparation for actually reproducing the acoustic signal is completed. When the acoustic signal is input from the acoustic signal input unit 14, the acoustic characteristic is converted by the acoustic characteristic conversion unit 15. Then, the sound is reproduced from each of the sound reproduction unit 19 of the first sound reproduction device 1 and the sound reproduction unit 29 of the second sound reproduction device 2 via each transmission path (Step 37).

  FIG. 7 shows integrated characteristics of the first sound reproduction device 1 and the second sound reproduction device 2 reproduced according to the sound adjustment parameters. It is shown that the acoustic characteristics are clearly improved as compared with FIG. 6 which is an integrated characteristic when the first acoustic reproduction device 1 and the second acoustic reproduction device 2 are reproduced as they are without any adjustment. Has been. In addition, as an auditory impression with the acoustic transfer characteristics of FIG. 7, the sound volume balance and phase of the sound outputs from the two sound reproducing devices are the same, so that it can be heard as if the sound is reproduced from one sound reproducing device. In addition, although the low sound range is reproduced from the floor-mounted speaker system 4, the high sound range is reproduced from the built-in speaker of the thin television 5, so that the localization position of the sound image of the reproduced sound is localized at the height of the television screen. As a result, the image position can be matched.

  The series of operations related to the acoustic adjustment described above are automatically executed by a program that reads out acoustic characteristic data held in advance and performs acoustic adjustment and data transfer processing under the control of the system control unit 16. The user of the sound reproducing device connects the first sound reproducing device 1 and the second sound reproducing device 2 with the data cable 3, turns on the respective power supplies, and performs sound measurement with an operation of starting reproduction. Thus, it is possible to perform sound reproduction with the acoustic characteristics appropriately adjusted as described above without requiring special labor.

(Embodiment 2)
Next, the operation of the sound reproduction system according to Embodiment 2 of the present invention will be described.

  In the present embodiment, in addition to the acoustic transfer characteristics of the individual sound reproduction devices similar to those of the first embodiment, the acoustic data storage units 11 and 21 have target characteristics to be realized measured under different measurement conditions. This is different from the first embodiment in that it includes acoustic transfer characteristics. Since the operations other than the above are the same as those in the first embodiment, in this embodiment, the block diagram showing the functional configuration of the sound reproduction system in FIG. 1 and the actual reproduction mode of the sound reproduction system and the user in FIG. The schematic diagram assuming the above and the flowchart showing the operation flow of the sound reproduction system of FIG. 3 can be described as the same as in the first embodiment.

FIG. 8 is a diagram illustrating the principle of the virtual sound localization process performed as the acoustic adjustment process in the second embodiment. Since the virtual sound source processing here uses what is generally implemented in this technical field, a detailed description of the principle is omitted, but as a basic principle, the virtual sound source processing is performed at a certain virtual sound source position X. The head transmission characteristics of the speaker are X _L and X _{R in} the order of the right ear position and the left ear position, and the first sound reproduction device 1 and the second sound for realizing the response of X _L and X _R are provided. As shown in FIG. 8, if the head transfer characteristics of the playback device 2 are C _LL , C _LR , C _RL , C _RR and H _LL , H _LR , H _RL , and H _RR , then X _L , X _R and C The relationship between _LL , C _LR , C _RL , C _RR and H _LL , H _LR , H _RL , H _RR can be expressed as follows.

Then, after calculating G _1L , G _1R , G _2L , and G _2R such that (Equation 1) and (Equation 2) hold, each of the first sound reproduction device 1 and the second sound reproduction device 2 is calculated. If FIR filters having the characteristics of G _1L , G _1R , G _2L , G _2R are inserted in front of the two speakers 17, 27, the speakers 17, 27 of the first sound reproduction device 1 and the second sound reproduction device 2 are used. The sound image is localized at the virtual sound source position X in FIG.

In order to realize the operation principle as described above, in the second embodiment, the data stored in the sound data storage units 11 and 21 is stored in the sound data storage unit 11 of the first sound reproduction device 1 as the first data. 1 of C _LL is the head transfer characteristics of the audio playback apparatus 1, and C _LR, C _RL, X _L and X _R is not stored a head-related transfer characteristic of the loudspeaker placed in the virtual sound source positions with C _RR The acoustic data storage unit 21 of the second sound reproduction device 2 stores H _LL , H _LR , H _RL , and H _{RR that} are head-related transfer characteristics of the second sound reproduction device 2. Some examples of data stored where the sound data storage unit 11 and 21, C _LL, respectively show X _L to H _LL and 11 in FIG. 10 in FIG.

Under the premise as described above, the data of the acoustic data storage units 11 and 21 of the first acoustic reproduction device 1 and the second acoustic reproduction device 2 are read out in the same manner as in the operation of the first embodiment. In the parameter calculation unit 13, G _1L , G _1R , G _2L , and G _{2R that} are acoustic adjustment conditions in the present embodiment are adapted according to LMS (Least Square Mean) error estimation from (Equation 1) and (Equation 2). Calculated by processing.

FIG. 12 shows the transfer characteristic of G _1L as an example of the acoustic adjustment condition calculated by the parameter calculation unit 13.

The calculated G _1L , G _1R , G _2L , and G _2R are transferred to the acoustic characteristic conversion unit 15 as coefficient data of the FIR filter, and when the acoustic signal is input from the acoustic signal input unit 14, the acoustic characteristic conversion unit 15, convolution calculation processing is performed using the respective coefficients, and the sound reproduction unit 19 of the first sound reproduction device 1 and the second sound reproduction device 2 are transmitted through the respective transmission paths in the same manner as in the first embodiment. By being reproduced from each of the sound reproduction units 29, the integrated characteristics of the first sound reproduction device 1 and the second sound reproduction device 2 are such that the sound image is localized at the virtual sound source position X in FIG.

  The sound reproduction system according to the present invention is based on an appropriate sound characteristic that is confirmed and stored in advance without requiring the user of the sound reproduction device to have a great deal of effort and advanced ability for sound adjustment. It is useful as a sound reproduction system that can easily realize good sound reproduction characteristics by calculating adjustment conditions and adjusting and reproducing a plurality of sound reproduction devices based on the sound adjustment conditions.

The block diagram which shows the function structure of the sound reproduction system of this invention Schematic diagram assuming the audio playback system of the present invention and the actual viewing mode of the user The flowchart which shows the operation | movement flow of the sound reproduction system of this invention. Acoustic transfer characteristic diagram of first sound reproduction device 1 according to Embodiment 1 of the present invention Acoustic transfer characteristic diagram of second sound reproduction device 2 in Embodiment 1 of the present invention Acoustic transfer characteristic diagram before acoustic characteristic adjustment in Embodiment 1 of the present invention Acoustic transfer characteristic diagram after acoustic characteristic adjustment in Embodiment 1 of the present invention Principle diagram of virtual sound image localization processing in Embodiment 2 of the present invention Head transmission characteristic diagram of first sound reproduction device 1 according to the second embodiment of the present invention. Head transfer characteristic diagram of second sound reproduction device 2 in Embodiment 2 of the present invention Head transfer characteristic diagram of sound reproduction device placed at virtual sound image position in Embodiment 2 of the present invention Acoustic transfer characteristic diagram placed in front of first sound reproduction device 1 in Embodiment 2 of the present invention The block diagram which shows the function structure of the sound reproduction system of a prior art

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st sound reproduction apparatus 2 2nd sound reproduction apparatus 3 Data cable 4 Floor-standing speaker system 5 Flat panel television 6 Data cable 11, 21 Acoustic data storage part 12, 22 Data communication part 13 Parameter calculation part 14 Acoustic signal input Unit 15 Acoustic characteristic conversion unit 16, 26 System control unit 17, 27 Speaker 18, 28 Power amplifier 19, 29 Sound reproduction unit

Claims (9)

A first sound reproduction device including a first speaker and a second sound reproduction device including a second speaker, and performing multiway reproduction by combining the first speaker and the second speaker. Sound reproduction system,
The first sound reproduction device includes a first data storage unit for storing first data including first reproduction band data indicating a reproduction band of the first speaker, and an acoustic signal input for inputting an acoustic signal. And a first acoustic signal for converting the characteristics of the acoustic signal from the acoustic signal input section and supplying it to the first speaker and a second acoustic signal for supplying to the second speaker The acoustic characteristic conversion unit to be generated, the parameter calculation unit for calculating the parameter for converting the characteristic of the acoustic signal by the acoustic characteristic conversion unit, and the second for performing data communication with the second acoustic device 1 data communication unit,
The second sound reproduction device includes: a second data storage unit that stores second data including second reproduction band data indicating a reproduction band of the second speaker; and the first sound device. A second data communication unit for performing data communication between the two,
The first speaker inputs and reproduces the first acoustic signal generated by the acoustic characteristic converter,
The second speaker inputs and reproduces the second acoustic signal generated by the acoustic characteristic conversion unit via the first data communication unit and the second data communication unit,
The parameter calculation unit inputs the first data from the first data storage unit, and the second data storage unit via the second data communication unit and the first data communication unit Based on the first reproduction band data included in the input first data and the second reproduction band data included in the input second data, the second data is input. A crossover frequency for way reproduction is obtained, and the acoustic characteristic conversion unit is configured to output the acoustic signal so that the reproduction output of the first speaker and the reproduction output of the second speaker crossover at the crossover frequency. An acoustic reproduction system characterized by calculating the parameter for converting frequency characteristics. The parameter calculation unit includes one reproduction band of the reproduction band of the first speaker included in the first reproduction band data and the reproduction band of the second speaker included in the second reproduction band data. The sound reproduction system according to claim 1, wherein a vicinity of a limit frequency is obtained as the crossover frequency. The first data further includes first reproduction efficiency data indicating reproduction efficiency of the first speaker,
The second data further includes second reproduction efficiency data indicating the reproduction efficiency of the second speaker,
The parameter calculation unit is configured to generate the crossover frequency based on the first reproduction efficiency data included in the input first data and the second reproduction efficiency data included in the input second data. The acoustic characteristic conversion unit calculates the parameter for converting the characteristic of the acoustic signal so as to compensate for the difference between the reproduction output level of the first speaker and the reproduction output level of the second speaker before and after The sound reproduction system according to claim 1, wherein: The first data further includes first delay amount data indicating a delay amount of the first speaker,
The second data further includes second delay amount data indicating a delay amount of the second speaker,
The parameter calculation unit is configured to use the first speaker based on the first delay amount data included in the input first data and the second delay amount data included in the input second data. The acoustic characteristic conversion unit calculates the parameter for converting the characteristic of the acoustic signal so as to compensate for the difference between the delay amount of the second speaker and the delay amount of the second speaker. Sound reproduction system. A multiway combined with a second sound reproducing device including a second data storage unit and a second data communication unit for storing second speaker and second reproduction band data indicating a reproduction band of the second speaker. An audio reproduction device for performing reproduction,
A first speaker;
A first data storage unit for storing first data including first reproduction band data indicating a reproduction band of the first speaker;
An acoustic signal input unit for inputting an acoustic signal;
A sound for generating a first sound signal for converting the characteristics of the sound signal from the sound signal input unit and supplying the converted sound signal to the first speaker and a second sound signal for supplying the second sound signal to the second speaker A characteristic converter,
A parameter calculation unit for calculating a parameter for converting the characteristic of the acoustic signal in the acoustic characteristic conversion unit;
A first data communication unit for performing data communication with the second acoustic device,
The first speaker inputs and reproduces the first acoustic signal generated by the acoustic characteristic converter,
The second speaker inputs and reproduces the second acoustic signal generated by the acoustic characteristic conversion unit via the first data communication unit and the second data communication unit,
The parameter calculation unit inputs the first data from the first data storage unit, and the second data storage unit via the second data communication unit and the first data communication unit Based on the first reproduction band data included in the input first data and the second reproduction band data included in the input second data, the second data is input. A crossover frequency for way reproduction is obtained, and the acoustic characteristic conversion unit is configured to output the acoustic signal so that the reproduction output of the first speaker and the reproduction output of the second speaker crossover at the crossover frequency. An acoustic reproduction apparatus characterized by calculating the parameter for converting a frequency characteristic. A sound reproduction method for performing multiway reproduction by combining a first speaker included in a first sound reproduction device and a second speaker included in a second sound reproduction device,
Inputting an acoustic signal to an acoustic signal input unit included in the first acoustic reproduction device;
An acoustic characteristic conversion unit included in the first acoustic reproduction device converts an acoustic signal characteristic from the acoustic signal input unit and supplies the first acoustic signal to the first speaker and the first acoustic signal. Generating a second acoustic signal for supply to the two speakers;
A parameter calculation step in which the parameter calculation unit included in the first sound reproduction device calculates a parameter for converting the characteristic of the acoustic signal by the acoustic characteristic conversion unit;
The first speaker inputs and reproduces the first acoustic signal generated by the acoustic characteristic conversion unit, and the second speaker generates the second acoustic signal generated by the acoustic characteristic conversion unit. And inputting and reproducing via a first data communication unit included in the first sound reproduction device and a second data communication unit included in the second sound reproduction device,
In the parameter calculation step, first reproduction band data indicating a reproduction band of the first speaker is input from a first data storage unit included in the first sound reproduction apparatus, and the second sound reproduction apparatus The second reproduction band data indicating the reproduction band of the second speaker is input from the second data storage unit included in the second data communication unit and the first data communication unit, and is input. A crossover frequency for multiway reproduction is obtained based on the first reproduction band data and the second reproduction band data, and the reproduction output of the first speaker and the second speaker at the crossover frequency. The sound characteristic conversion unit calculates the parameter for converting the frequency characteristic of the sound signal so that the reproduction output of the sound crosses over. Playback method. A first sound reproducing device including a first speaker and a second sound reproducing device including a second speaker are provided, and surround reproduction is performed by combining the first speaker and the second speaker. A sound reproduction system,
The first sound reproduction device includes: a first data storage unit that stores first head-related transfer function data indicating transfer characteristics from the first speaker to the left and right ears at a predetermined viewing position; and an acoustic signal. An acoustic signal input unit for input, a first acoustic signal for converting the characteristics of the acoustic signal from the acoustic signal input unit and supplying the converted characteristic to the first speaker and a first acoustic signal for supplying to the second speaker Data communication between the acoustic characteristic conversion unit that generates the second acoustic signal, a parameter calculation unit that calculates a parameter for converting the characteristic of the acoustic signal by the acoustic characteristic conversion unit, and the second acoustic device A first data communication unit for performing
The second sound reproduction device includes: a second data storage unit that stores second head-related transfer function data indicating transfer characteristics from the second speaker to the left and right ears at the predetermined viewing position; A second data communication unit for performing data communication with one acoustic device,
The first speaker inputs and reproduces the first acoustic signal generated by the acoustic characteristic converter,
The second speaker inputs and reproduces the second acoustic signal generated by the acoustic characteristic conversion unit via the first data communication unit and the second data communication unit,
The parameter calculation unit includes the first head-related transfer function data input from the first data storage unit, and the second data communication unit and the first data communication unit from the second data storage unit. Based on the first head-related transfer function data input via the sound, the acoustic characteristic conversion unit calculates the parameters for converting the characteristic of the acoustic signal so that a sound image is localized at an arbitrary virtual sound source position The sound reproduction system characterized by doing. A second data storage unit and a second data communication unit for storing second head-related transfer function data indicating transfer characteristics from the second speaker and the second speaker to the left and right ears at the predetermined viewing position; A sound reproduction device for performing surround reproduction in combination with a second sound reproduction device including:
A first speaker;
A first data storage unit that stores first head-related transfer function data indicating transfer characteristics from the first speaker to the left and right ears at a predetermined viewing position;
An acoustic signal input unit for inputting an acoustic signal;
A sound for generating a first sound signal for converting the characteristics of the sound signal from the sound signal input unit and supplying the converted sound signal to the first speaker and a second sound signal for supplying the second sound signal to the second speaker A characteristic converter,
A parameter calculation unit for calculating a parameter for converting the characteristic of the acoustic signal in the acoustic characteristic conversion unit;
A first data communication unit for performing data communication with the second acoustic device,
The first speaker inputs and reproduces the first acoustic signal generated by the acoustic characteristic converter,
The second speaker inputs and reproduces the second acoustic signal generated by the acoustic characteristic conversion unit via the first data communication unit and the second data communication unit,
The parameter calculation unit includes the first head-related transfer function data input from the first data storage unit, and the second data communication unit and the first data communication unit from the second data storage unit. Based on the first head-related transfer function data input via the sound, the acoustic characteristic conversion unit calculates the parameters for converting the characteristic of the acoustic signal so that a sound image is localized at an arbitrary virtual sound source position A sound reproducing device characterized in that: A sound reproduction method for performing surround reproduction by combining a first speaker included in a first sound reproduction device and a second speaker included in a second sound reproduction device,
Inputting an acoustic signal to an acoustic signal input unit included in the first acoustic reproduction device;
An acoustic characteristic conversion unit included in the first acoustic reproduction device converts an acoustic signal characteristic from the acoustic signal input unit and supplies the first acoustic signal to the first speaker and the first acoustic signal. Generating a second acoustic signal for supply to the two speakers;
A parameter calculation step in which the parameter calculation unit included in the first sound reproduction device calculates a parameter for converting the characteristic of the acoustic signal by the acoustic characteristic conversion unit;
The first speaker inputs and reproduces the first acoustic signal generated by the acoustic characteristic conversion unit, and the second speaker generates the second acoustic signal generated by the acoustic characteristic conversion unit. And inputting and reproducing via a first data communication unit included in the first sound reproduction device and a second data communication unit included in the second sound reproduction device,
In the parameter calculation step, a first head transmission indicating a transfer characteristic from the first speaker to the left and right ears at a predetermined viewing position, which is input from a first data storage unit included in the first sound reproduction device. Function data and the predetermined value from the second speaker input from the second data storage unit included in the second sound reproduction device via the second data communication unit and the first data communication unit. The acoustic characteristic conversion unit converts the characteristic of the acoustic signal so that the sound image is localized at an arbitrary virtual sound source position based on the second head-related transfer function data indicating the transmission characteristic to the left and right ears at the viewing position. The sound reproduction method characterized by calculating the parameter.

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