JPWO2006009004A1 - Sound reproduction system - Google Patents

Abstract

Spatial characteristic analysis that measures sound field data in a space where the sound is amplified to provide a sound reproduction system that easily reproduces the sound field space that the user wants to listen to without setting complicated parameters Sound field data measuring means (324, 325, 326, 327), display control means (332) for controlling display means (333) such as a plasma display on which image information relating to space is displayed, and a plasma display Sound reproduced based on selection means (328) such as a mouse for selecting the displayed image information, target data related to the selected image information, and sound field measurement data measured by the sound field data measurement means Control reproduction means (200, 329) such as a CPU for controlling the output, and output control means (322, 323) for controlling the output of the reproduced information Characterized in that it has.

Description

    The present invention relates to the technical field of sound reproduction systems.

Conventionally, an audio system that provides a high-quality sound field space has been required to automatically create an appropriate sound field space that provides a sense of reality. Therefore, a technique is known that adjusts reproduction characteristics such as phase characteristics, frequency characteristics, and reverberation characteristics of reproduced sound reproduced by a plurality of speakers in accordance with a user's sound field space (for example, Patent Document 1).
JP 2001-224100 A

  The sound reproduction system described in Patent Document 1 includes an equalizer that adjusts the frequency characteristics of an audio signal, an inter-transmission line level adjusting unit that adjusts the level of the audio signal, and a delay unit that adjusts the delay time of the audio signal. The input audio signal is supplied to the sound emission means through the equalizer, the level adjustment means between the transmission lines and the delay means. According to this sound reproduction system, noise generating means for individually supplying noise to each signal transmission path at the time of sound field correction, detection means for detecting reproduced sound of noise reproduced by each sound emitting means, and detection means Frequency characteristic correcting means for correcting the frequency characteristics of each equalizer based on the detection results of the above, and inter-transmission path level correcting means for correcting the adjustment amounts of the plurality of inter-transmission path level adjusting means based on the detection results of the detecting means, A phase characteristic correcting unit that obtains a phase characteristic of a reproduced sound reproduced by the sound emitting unit based on a detection result of the detecting unit and corrects a delay time of each delay unit based on the obtained phase characteristic. It is characterized by.

However, in the conventional sound reproduction system having the above-described configuration, it is necessary for the user to correct the sound field space by inputting a large number of reproduction characteristics such as phase characteristics, frequency characteristics, and reverberation characteristics individually. is there. Therefore, creating a sound field space imaged by the user is a very complicated and difficult task.
Accordingly, it is an object of the present application to provide an acoustic reproduction system that easily reproduces an arbitrary sound field space such as a sound field space that a user desires to audition.

    The sound reproduction system of the present invention is installed in a listening room 10 and measures a spatial characteristic such as a frequency characteristic and a reverberation characteristic of a sound that is amplified in the listening room 10, a D / A converter 322, and a power amplifier. 323, a speaker system 130, a microphone amplifier 325, an A / D converter 326, a spatial characteristic analysis unit 327, and the like, and a liquid crystal display device and a plasma display that display a sound field space such as various hall images A display control unit 130 for controlling the display unit 333, an operation unit 328 such as a mouse for selecting various hole images displayed on the liquid crystal display device or the plasma display display unit 333, various holes, etc. The relationship between the display screen and target frequency data such as various halls is the frequency characteristics data and reverberation characteristics data. The memorized storage unit 330, the frequency characteristic data, the sound pressure level / delay time characteristic data, and the reverberation characteristic data, which are target data such as various holes selected by a mouse or the like, are measured by the sound field data measuring means. System controller as a generation means for generating a new listening room frequency characteristic correction coefficient LFC, sound pressure level correction coefficient LLC, delay characteristic correction coefficient LDC and reverberation characteristic correction coefficient LZC based on the sound field measurement data of the listening room 329 and the new listening room frequency characteristic correction coefficient LFC, sound pressure level correction coefficient LLC, delay characteristic correction coefficient LDC, and reverberation characteristic correction coefficient LZC generated by the system control unit 329, and sample sound data SS and sound source output Play sound input from device 110 A reproducing means such as an input processing unit 121 and a signal processing unit 200, and an output means such as a D / A converter 322 and a power amplifier 323 for outputting information reproduced by the reproducing means. Yes.

    According to this configuration, the user does not need to perform a complicated operation of inputting various characteristic data of the music hall sound field data numerically. On the other hand, a sound effect similar to that played in a specific music hall or performance hall can be obtained in the sound field space used by the user. That is, in a space such as a home room, a space such as a music hall can be easily set, and a sense of reality similar to that heard in a space such as a music hall can be obtained.

In addition, the sound reproduction system of the present invention has a display means such as a liquid crystal display device or a plasma display, a chart representing the frequency characteristics of sound field data, a chart representing the phase characteristics, a chart representing the reverberation characteristics, and various types of speakers. The figure, the figure showing the size of the speaker, or the figure showing the positional relationship between the speaker and the user are displayed. After the information related to the target data is displayed on the display device, the target data is selected by the user selecting desired information displayed on the display device. It is also possible to listen to the sound source with headphones in the sound field for selection. As a result, the target sound field can be confirmed by ear.
Sound is reproduced based on the selected target data.

    According to this configuration, various acoustic characteristics can be adjusted through vision, and the user can more easily and intuitively adjust the acoustic environment in a space such as a home room by using a binaural sound source. You will be able to choose.

    Furthermore, the sound reproduction system of the present invention can edit at least a part of the speaker image selected by the mouse by moving the mouse, moving the speaker image larger, or changing the positional relationship between the speaker and the user. Can do. The speaker image edited in this way can be used as the target data described above, and based on the edited speaker, the frequency characteristic correction coefficient LFC and the sound pressure level of the listening room set in advance for determining the sound to be amplified from the speaker. The calculation unit 331 converts the correction coefficient LLC, delay characteristic correction coefficient LDC, or reverberation characteristic correction coefficient LZC into a new listening room frequency characteristic correction coefficient LFC sound pressure level correction coefficient LLC, delay characteristic correction coefficient LDC, or reverberation characteristic correction coefficient LZC. Calculate as Based on the calculated frequency characteristic correction coefficient LFC of the listening room, the signal processing control unit 260 controls the frequency characteristic adjustment circuit 230 to change the frequency characteristic of the sound that is output from the speaker system 130. Further, the signal processing control unit 260 controls the signal level / delay adjustment unit 240 based on the calculated sound pressure level correction coefficient LLC and delay characteristic correction coefficient LDC, and the signal level or delay time of the sound that is output from the speaker system 130 To change. Further, the signal processing control unit 260 controls the reverberation control circuit 250 based on the calculated reverberation characteristic correction coefficient LZC of the listening room, and changes the reverberation characteristic of the sound amplified from the speaker system 130.

    According to this configuration, for example, when adjusting the sound pressure level between the speakers, a plurality of speakers are displayed on the display screen, and the size of the speakers is changed by an instruction from a mouse or a keyboard. It is possible to change the sound pressure level. For example, when changing the distance from the speaker to the user, a diagram related to the positional relationship between the speaker and the user is displayed on the screen, and the distance between the two is changed by an instruction from the mouse or keyboard. Accordingly, it is possible to change the time of sound reaching the user from the speaker.

    Furthermore, in the sound reproduction system of the present invention, the storage unit 330 stores the frequency, the intensity of the frequency, the time of the reverberant sound, the intensity of the reverberant sound, and the delay time until the output sound from the output unit reaches the user. Information related to at least one of them is recorded. The signal processing unit 200 includes at least one of a frequency characteristic adjusting circuit 230, a signal level / delay adjusting unit 240, and a reverberation control circuit 250 that can adjust a frequency characteristic for each finely divided frequency band. Yes.

    According to this configuration, it is possible to divide the sound output from one output means into a plurality of frequency bands and adjust the sound intensity for each frequency band. Therefore, it becomes possible to finely control the frequency characteristics peculiar to each space, and it is easy to correct the frequency characteristics of one space to the frequency characteristics of another space. You will be able to get a sense of realism in the space of your home room.

    In addition, since it is possible to adjust the time for the sound output from one output means and the sound output from the other output means to reach the user, the delay time of the direct sound can be corrected. It becomes possible.

    In addition, since the reverberation time for each frequency band can be controlled, the sound generated in the sound field is repeatedly reflected on the surrounding walls and ceiling to control the reverberation characteristics unique to the sound field that forms a complex sound field. It becomes possible to do. That is, the reverberation characteristic of one sound field can be easily reproduced in a space such as a room at home which is another sound field.

    Furthermore, the sound reproduction system of the present invention is configured such that when information related to a sound field space such as a hall and a speaker is displayed on a liquid crystal display device or a plasma display, the user uses a mouse to sound the hall and the speaker. When information related to the field space is selected, the binaural sound source corresponding to each image can be reproduced from the headphones and confirmed by the ear.

    According to this configuration, it is possible to easily check on the spot how the sound reproduced in the music hall or the like desired by the user can be heard. In other words, if the sound that the user is trying to play does not play as the user wants, search other music halls immediately and select the music hall that has the acoustic characteristics that the user wants to hear Can be redone.

    Furthermore, the sound reproduction system of the present invention includes sound field data such as reverberation characteristics, frequency characteristics, delay time characteristics, and sound pressure level characteristics associated with image information such as a hall that the user desires to view and a test signal unit 324. , Reverberation characteristics, frequency characteristics measured by sound field data measurement means including a D / A converter 322, a power amplifier 323, a speaker system 130, a microphone amplifier 325, an A / D converter 326, a spatial characteristic analysis unit 327, and the like. Comparison operation means such as an operation unit 331 for comparing and calculating sound field data such as delay time characteristics and sound pressure level characteristics, and holes stored in the storage means such as the storage unit 330 based on the result of the comparison operation. Extraction means such as a system control unit 329 for extracting image information such as.

  According to this configuration, when the sound field measurement is started, an image such as a sound field space such as a target hall, the positional relationship of the speakers, and the size of the speaker indicating the sound pressure level amplified from the speakers is displayed. It represents not only the sound field data measured by the sound field data measuring means, but also the sound field space such as a hall corresponding to the sound field data in the middle of the process, the positional relationship of the speakers, and the sound pressure level amplified from the speakers. An image such as the size of the speaker can be displayed. Accordingly, the waiting time during correction close to the target data can be enjoyed by visually observing an image showing the progress on the way displayed on a display device such as a liquid crystal display device or a plasma display.

It is a block diagram which shows the structure of the surround system of embodiment. It is an example of the installation drawing of each speaker in a surround system. It is a block diagram which shows the structure of the signal processing part in embodiment. It is a block diagram which shows the structure of the spatial characteristic analysis part in embodiment. It is a figure which shows the state by which the frequency characteristic data corresponding to image information, such as a hall | hole, reverberation characteristic data, etc. are memorize | stored. 4 is a diagram schematically showing image information displayed on a display unit 333. FIG. It is a flowchart which shows operation | movement of 1st Embodiment. It is a flowchart which shows operation | movement of 2nd Embodiment. It is a figure of the speaker displayed on the display part 333 in 2nd Embodiment. It is a figure which shows the positional relationship of the speaker displayed on the display part 333 in 2nd Embodiment, and a listening position. It is a flowchart which shows operation | movement of 3rd Embodiment. It is the figure which represented typically a part of image information displayed on the display part 333 in 3rd Embodiment. 10 is a flowchart showing the operation of Modification 2. It is a figure which shows the positional relationship of the speaker displayed on the display part 333 in the modification 2, and a listening position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Surround system 130 ... Speaker system 140 ... Microphone 200 ... Signal processing part 230 ... Frequency characteristic adjustment circuit 240 ... Signal level / delay adjustment part 250 ... Reverberation control circuit 251 ... Filter processing part 320 ... Signal processing apparatus 327 ... Spatial characteristic analysis Unit 328 ... operation unit 329 ... system control unit 330 ... storage unit 331 ... calculation unit 332 ... display control unit
333 ... display section

  Next, an embodiment best suited for the present application will be described with reference to the drawings.

  The following embodiment is an embodiment in which the sound reproduction system of the present application is applied to a 5.1ch (channel) sound reproduction system (hereinafter simply referred to as a surround system).

  In the first embodiment, sound field data generation processing that allows the user to experience a sense of reality as if listening in a concert hall in a specific listening room will be described. In addition, the second processing operation in which the sound field data is arbitrarily changed by manipulating the image information related to the sound field data displayed on the display device without the user individually inputting numerical values of a large number of sound field data. The embodiment will be described.

(I) Overall Configuration and Operation First, the overall configuration of the surround system according to each embodiment will be described with reference to FIG. 1 and FIG. FIG. 1 is a block diagram illustrating a schematic configuration example of the information recording apparatus according to each embodiment. FIG. 2 is an example for explaining the installation of each speaker in the surround system of each embodiment.

  As shown in FIG. 1, the surround system 100 of each embodiment is installed in a listening room 10, that is, in a sound field space for providing a sound to be reproduced to a listener. Are reproduced or acquired, and predetermined signal processing is performed on the reproduced sound or the acquired sound. Then, the surround system 100 amplifies signal-processed sound to each speaker by a speaker system 130 including a plurality of speakers, and provides a sound field space with a sense of presence (surround feeling) to the listener. It has become.

  The surround system 100 reproduces a sound source such as a recording medium or obtains a sound source from the outside such as a television signal, thereby converting bit stream data in a certain format having channel components corresponding to each speaker. The sound source output device 110 to be output and the bit stream output from the sound source output device 110 are decoded into audio signals for each channel, signal processing is performed for each audio signal of each channel, and the reproduction characteristics of the listening room 10 are improved. A signal processing device 320 to be analyzed, a speaker system 130 including various speakers corresponding to each channel, a microphone 140 used when analyzing the reproduction characteristics of the listening room 10, and various types for specifying a sound field space A display unit 333 for performing display; Et al constructed.

  The channel refers to a signal transmission path of an audio signal (DC, DFL, DFR, DSL, DSR, DSW) in which reproduction characteristics such as acoustic characteristics and reverberation characteristics output from the signal processing unit 200 are changed.

  The sound source output device 110 is composed of, for example, a media playback device such as a CD (Compact disc) or a DVD (Digital Versatile Disc) or a reception device that receives a digital television broadcast, or by playing back a sound source such as a CD, or By acquiring the broadcast sound source, bit stream data having each channel component corresponding to 5.1 ch is output to the signal processing device 320.

  The bit stream data having each channel component output from the sound source output device 110 is input to the signal processing device 320, and the signal processing device 320 receives the input bit stream data of each channel. The audio signal (DC, DFC, DFR, DSL, DSR, DSW) is decoded.

  In addition, the signal processing device 320 performs signal processing such as frequency component adjustment, delay time addition, reverberation component addition, and addition to audio signals of other channels on each decoded audio signal. Thus, each signal-processed audio signal is converted into an analog signal to adjust the signal level. The signal processing device 320 outputs each audio signal whose signal level is adjusted to each speaker of the speaker system 130.

  The details of the configuration and operation of the signal processing device 320 in each embodiment will be described later. Moreover, for example, the signal processing device 320 of each embodiment constitutes the sound reproduction system of the present invention.

  The speaker system 130 includes a center speaker 131 installed in front of the listening position (RV) and a front left speaker installed in front of the listening position and on the left side or the right side of the center speaker 131 (hereinafter referred to as “the left speaker”). 132FL and front right speaker (hereinafter referred to as FR speaker) 132FR and surround left speaker (hereinafter referred to as SL speaker) 132SL and surround right installed on the left or right side behind the listening position A speaker (hereinafter referred to as an SR speaker) 132SR is installed, for example, as shown in FIG.

  The microphone 140 is connected to the signal processing device 320 and is arranged at a listening position, which is a position where the listener listens, and is used when analyzing the spatial characteristics of the listening room 10 described later. Yes. In particular, the microphone 140 of each embodiment collects a loud sound based on the test signal output from the speaker system 130, converts the collected loud sound into an electric signal, and collects the sound signal. Is output to the signal processing device 320.

  Next, the configuration and operation of the signal processing device 320 will be described.

  As shown in FIG. 1, the signal processing device 320 of each embodiment receives bitstream data of a predetermined format having each channel component, and audio data of a signal format used when decoding into an audio signal for each channel. An input processing unit 121 that converts the converted audio data into an audio signal for each channel, a signal processing unit 200 that performs signal processing for each channel, and a digital / A D / A converter 322 that performs analog (hereinafter referred to as D / A) conversion, a power amplifier 323 that amplifies the signal level of the signal of each channel for each channel, and an operation unit 328 for operating each unit A system control unit 329 for controlling each unit based on an operation of the operation unit 328, and a display unit 333 A display control unit 332 for controlling the display state, a storage unit 330 for storing information such as image information and reproduction characteristics displayed on the display unit 333, and a calculation unit 331 for calculating information such as reproduction characteristics. ing.

  In addition, the signal processing device 320 receives a signal collected by the microphone 140 in advance, and a test signal generator 324 that generates a test signal used when analyzing reproduction characteristics such as frequency characteristics and reverberation characteristics of the listening room 10. A microphone amplifier 325 for amplifying to a set signal level; an A / D converter 326 for performing analog / digital (hereinafter referred to as A / D) conversion for converting the amplified sound collection signal from an analog signal to a digital signal; , A spatial characteristic analysis unit 327 that analyzes the spatial characteristics of the listening room 10 based on the collected sound signal converted into a digital signal, an operation unit 328 for operating each unit, and each unit based on the operation of the operation unit 328 And a system control unit 329 for controlling.

  The input processing unit 121 receives bit stream data in a predetermined format having each channel component, and the input processing unit 121 converts the input bit stream data into audio data in a predetermined format. The converted audio data is output to the signal processing unit 200.

  The signal processing unit 200 receives the audio data output from the input processing unit 121 and the test signal generated by the test signal generation unit 324. The signal processing unit 200 receives the input audio. The data is decoded into an audio signal for each channel, predetermined signal processing is performed for each channel, and the audio signal is output to each D / A converter 322 for each channel. In addition, the signal processing unit 200 includes a calculation unit based on the listening room characteristics analyzed by the spatial characteristic analysis unit 327 and the reproduction characteristics based on the image information selected by the display unit 333 under the control of the system control unit 329. The new reproduction characteristic calculated in 331 is set for each channel, and an audio signal is output to each D / A converter 322 for each channel. Furthermore, a predetermined process for amplifying the input test signal and the sample sound stored in the storage unit 330 for each speaker is performed and output to each D / A converter 322 as an audio signal for each channel. It has become.

  The details of the configuration and operation of the signal processing unit 200 in each embodiment will be described later.

  The D / A converter 322 receives each audio signal that has been subjected to signal processing for each channel. The D / A converter 322 is a digital signal that is input. The audio signal is converted into an analog signal and output to each power amplifier 323.

  The power amplifier 323 receives an audio signal that has been subjected to signal processing for each channel, amplifies the signal level of the audio signal for each channel, and supports each amplified audio signal for each channel. It outputs to each speaker.

  The test signal generation unit 324 generates a test signal used when analyzing reproduction characteristics such as frequency characteristics and reverberation characteristics of the listening room 10, and outputs the generated test signal to the signal processing unit 200. Yes. Specifically, the test signal generation unit 324 generates a test signal such as white noise, pink noise, or a sweep signal that sweeps the frequency in a certain frequency range under the system control unit 329, and the generated test The signal is output to the signal processing unit 200.

  Note that the test signal generation unit 324 of each embodiment generates a test signal in conjunction with the signal processing unit 200 and the spatial characteristic analysis unit 327 under the system control unit 329, and sound field data described later. Is used when setting.

  The microphone amplifier 325 receives the sound collection signal output from the microphone 140, and the microphone amplifier 325 amplifies the input sound collection signal to a preset signal level and performs the amplification. The collected sound signal is output to the A / D converter 326.

  The A / D converter 326 receives the sound collection signal output from the microphone amplifier 325, and the A / D converter 326 converts the input sound collection signal from an analog signal to a digital signal. And the collected sound signal converted into the digital signal is output to the spatial characteristic analysis unit 327.

  The sound collection signal converted into a digital signal is input to the spatial characteristic analysis unit 327. This spatial characteristic analysis unit 327 analyzes the frequency characteristic of the input sound collection signal and the sound pressure thereof. Level analysis, delay time analysis, and reverberation component analysis are performed, and the signal processing unit 200 is controlled via the system control unit 329 based on each analysis result. In particular, the spatial characteristic analysis unit 327 of each embodiment performs each analysis based on a sound collection signal based on a test signal output from the speaker system 130.

  Details of the configuration and operation of the spatial characteristic analysis unit 327 in each embodiment will be described later.

  The operation unit 328 inputs each instruction by operating a pointer in the screen in conjunction with a remote control device including various keys such as various confirmation buttons, selection buttons, and numeric keys, various key buttons, or a display unit 333. The mouse is one of pointing devices. The operation unit 328 inputs an instruction for analyzing the spatial characteristics of the listening room 10, or selects or edits image information corresponding to sound field data for processing an audio signal. Used for.

  The system control unit 329 comprehensively controls general functions for amplifying the audio signal from each speaker. In particular, when analyzing the reproduction characteristics such as the frequency characteristic and the reverberation characteristic of the listening room 10, the system control unit 329 selects a speaker that amplifies the test signal, and represents the reproduction characteristic such as the frequency characteristic and the reverberation characteristic. Sound field data (hereinafter referred to as sound field data) is analyzed by the spatial characteristic analysis unit 327. Further, processing for setting reproduction characteristics such as frequency characteristics and reverberation characteristics is performed based on a user operation of the operation unit 328.

  The storage unit 330 includes image information such as a famous performance hall displayed on the display unit 333, sound field data such as frequency characteristics and reverberation characteristics corresponding to the image information, and 2 attached to a doll's ear (dummy head). A sound source such as the hall, which is a so-called binaurally recorded sound source, which is a recording method for recording sound with two microphones, listening field sound field measurement data, various correction coefficients, sample sound data, and the like are stored in advance.

  Details of each data stored in the storage unit 330 will be described later.

  The calculation unit 331 is analyzed by the reproduction characteristic information such as a famous performance hall stored in the storage unit 330 and the spatial characteristic analysis unit 327 or after being analyzed by the spatial characteristic analysis unit 327 and stored in the storage unit 330. Based on the reproduction characteristic information of the listening room, new reproduction characteristic information for performing signal processing when the audio signal is reproduced is calculated. The new reproduction characteristic information is output to the signal processing unit 200 under the control of the system control unit 329.

  Next, the configuration and operation of the signal processing unit 200 of each embodiment will be described with reference to FIG. FIG. 3 is a block diagram illustrating a configuration of the signal processing unit 200 in each embodiment.

  As described above, the signal processing unit 200 decodes the audio data input from the input processing unit 121 into an audio signal for each channel, and outputs the decoded audio signal for each channel and the test signal generation unit 324. The input to the test signal is switched. The signal processing unit 200 performs predetermined signal processing for each input channel on the input signal, and amplifies the input test signal for each speaker under the control of the system control unit 329. The predetermined processing is performed.

  Specifically, the signal processing unit 200 decodes an audio signal for each channel based on the input audio data, an audio signal for each channel output from the data, and an input test signal. The input switching unit 220 for switching, the frequency characteristic adjusting circuit 230 for adjusting the frequency characteristic of the audio signal or the test signal for each channel, and the signal level between channels with other channels are adjusted, and input for each channel. A signal level / delay adjustment unit 240 that delays the received signal, a reverberation control circuit 250 that generates a reverberation component of the audio signal or test signal for each channel, and adds the reverberation component to the audio signal or test signal, and a system control unit 329 Under control, each part in the signal processing unit 200 is controlled. It has a signal processing control unit 260, a.

  The signal processing unit 200 includes a frequency characteristic adjustment circuit 230, a signal level / delay adjustment unit 240, and a reverberation control circuit 250 for each channel. The signal processing control unit 260 and each unit are connected by a bus B. It is connected.

  Audio data is input to the decoder 210. The decoder 210 decodes the input audio data into an audio signal for each channel, and outputs the audio signal to the input switching unit 220 for each channel. It is like that.

  An audio signal decoded for each channel and a test signal output from the test signal generator 324 are input to the input switching unit 220. The input switching unit 220 includes a signal processing control unit 260. Under the control, the audio signal output from the decoder 210 and the test signal generated by the test signal generator 324 are switched and output to each frequency characteristic adjuster. The input switching unit 220 outputs the test signal to each channel or to one channel selected by the signal processing control unit 260 when outputting the test signal.

  In each frequency characteristic adjustment circuit 230, a frequency characteristic correction coefficient LFC for adjusting the gain of the signal component is set for each frequency band under the control of the signal processing control unit 260. Yes. Each frequency characteristic adjustment circuit 230 receives an input audio signal or test signal for each channel, and a signal input based on each set frequency characteristic correction coefficient LFC. The frequency characteristics are adjusted for the signal level and output to each signal level / delay adjustment unit 240.

  Each signal level / delay adjustment unit 240 has a coefficient (hereinafter referred to as a level correction coefficient LAC) for adjusting a signal level between channels for each channel under the control of the signal processing control unit 260, and each. A coefficient for adjusting a delay amount (delay time) in the audio signal or test signal corresponding to the channel (hereinafter referred to as a delay characteristic correction coefficient LDC) is set. Each signal level / delay adjustment unit 240 is input with an audio signal or a test signal whose frequency characteristics are adjusted for each frequency band. Based on the set level correction coefficient LAC and delay characteristic correction coefficient LDC, the signal level and the delay amount between the channels are adjusted with respect to the input signal, and the audio signal in which the signal level and the delay amount are adjusted or A test signal is output to each reverberation control circuit 250.

  Each reverberation control circuit 250 is set with a reverberation characteristic correction coefficient LZC determined as described later by the signal processing control unit 260, and each reverberation control circuit 250 has its signal level adjusted. The reverberation control is executed on the audio signal or test signal and output to each D / A converter 122.

  Specifically, an audio signal or a test signal whose signal level and delay amount are adjusted is input to each reverberation control circuit 250, and each reverberation control circuit 250 is input for each channel. The generated audio signal or test signal is divided into a plurality of frequency bands. Each reverberation control circuit 250 generates a reverberation component for each frequency band in an audio signal or a test signal input based on a reverberation characteristic correction coefficient LZC described later, and the generated reverberation component is input. The reverberation control is performed by adding to the audio signal or the test signal, and the reverberation-controlled signal is output to each D / A converter 122.

  The signal processing control unit 260 determines and sets each coefficient of each frequency characteristic adjustment circuit 230, each signal level / delay adjustment unit 240, and each reverberation control circuit 250 under the instruction of the system control unit 329. ing.

  Specifically, the signal processing control unit 260 indicates information indicating gain, which is gain data for each frequency band output from the calculation unit 331, information indicating a signal level, information indicating a delay time, and each reverberation component. Based on the information, the frequency characteristic correction coefficient LFC, the level correction coefficient LAC, the delay characteristic correction coefficient LDC, and the reverberation characteristic correction coefficient LZC are calculated, and the calculated correction coefficients are respectively set to the frequency characteristic adjustment circuits 230 and the signals. The level / delay adjustment unit 240 and each reverberation control circuit 250 are set.

  The signal processing control unit 260 receives the frequency characteristic correction coefficient LFC, the level correction coefficient LAC, the delay characteristic correction coefficient LDC, and the reverberation characteristic correction coefficient LZC stored in the storage unit 330 under the instruction of the system control unit 329. It also functions to input and set these correction coefficients in each frequency characteristic adjustment circuit 230, each signal level / delay adjustment unit 240, and each reverberation control circuit 250, respectively.

  Next, the configuration and operation of the spatial characteristic analysis unit 327 in the present embodiment will be described with reference to FIG. FIG. 4 is a block diagram showing the configuration of the spatial characteristic analysis unit 327 in the present embodiment.

  The spatial characteristic analysis unit 327 is input with a sound collection signal generated by collecting a loud sound that has been amplified based on the test signal. The spatial characteristic analysis unit 327 is configured as described above. Based on the input sound collection signal, the frequency characteristics of the loud sound output for each channel, the sound pressure level analysis, the delay time analysis, and the reverberation component analysis are performed. Based on the result, each data is output to the calculation unit 331 via the system control unit 329.

  The spatial characteristic analysis unit 327 includes a frequency characteristic analysis unit 327A that analyzes the frequency characteristic of the listening room 10, and a sound pressure level / delay time that analyzes the sound pressure level and the delay time that are amplified from each speaker in the listening room 10. An analysis unit 327B and a reverberation characteristic analysis unit 327C that analyzes the reverberation characteristic of the listening room 10 are configured.

  The frequency characteristic analysis unit 327A analyzes the frequency characteristic at the installation position of the microphone 140 in the listening room 10 based on the collected sound signal in the input test signal, and via the system control unit 329, The analysis result is output to the calculation unit 331 as the frequency characteristic data LF of the listening room. Further, the system control unit 329 stores the analysis result in the storage unit 330 as the frequency characteristic data LF.

  Specifically, the frequency characteristic analysis unit 327A identifies, for each channel, a plurality of predetermined frequency bands based on the sound collection signal in the input test signal, and for each identified frequency band. The sound pressure level is calculated. The frequency characteristic analysis unit 327A outputs the calculated sound pressure level for each frequency band to the calculation unit 331 as the frequency characteristic data LF of the listening room. Further, the system control unit 329 stores the analysis result in the storage unit 330 as the frequency characteristic data LF of the listening room.

  The sound pressure level / delay time analysis unit 327B analyzes the sound pressure level and delay time amplified from each speaker at the installation position of the microphone 140 in the listening room 10 based on the collected sound signal in the input test signal. The analysis result is output to the calculation unit 331 as predetermined data via the system control unit 329. Further, the system control unit 329 stores the analysis result as data in the storage unit 330.

  Specifically, the sound pressure level / delay time analysis unit 327B is configured to make the signal level of the audio signal or test signal amplified through each channel uniform based on the collected sound signal in the input test signal. Analysis and delay time analysis are performed, and the loud sound level (sound pressure level) and delay time for each channel based on the sound collection signal obtained when the test signal is sounded for each speaker. Is calculated. Then, the sound pressure level / delay time analysis unit 327B uses the calculated loud sound level and delay time as the sound pressure level data LL and the delay time data LD of the listening room, and the calculation unit 331 via the system control unit 329. To output. Further, the system control unit 329 stores the analysis result in the storage unit 330 as the sound pressure level data LL and the delay time data LD of the listening room.

  The reverberation characteristic analysis unit 327C analyzes the reverberation characteristic in the listening room 10 based on the collected sound signal in the input test signal, and the analysis result is set as predetermined data via the system control unit 329. The data is output to the calculation unit 331. The reverberation characteristic is a temporal attenuation characteristic from the time when reproduction of the loud sound to be heard at an arbitrary listening position in the listening room 10 is stopped.

  Specifically, the reverberation characteristic analysis unit 327C calculates the reverberation characteristic for each frequency band based on the collected sound signal in the input test signal, and the calculated reverberation characteristic is the reverberation characteristic data LZ of the listening room. Is output to the calculation unit 331. In addition, the system control unit 329 stores the analysis result in the storage unit 330 as the reverberation characteristic data LZ of the listening room.

  Next, the information memorize | stored in the memory | storage part 330 in each embodiment is demonstrated using FIG. FIG. 5 is a block diagram showing the internal structure of the storage unit 330.

  The storage unit 330 includes a hole A data area AD in which various data related to the sound field space hole A are stored, a hole B data area BD in which various data related to the sound field space hole B are stored, and a sound field space hall. Hall C data area CD in which various data relating to C described later are stored, listening room area LR in which various data relating to listening room 10 described later and various correction coefficients are stored, sample sound data area SD in which sample sounds are stored, etc. A data area is provided.

  In the hole A data area AD, hole A image data PA, which is image information schematically representing the hole A displayed on the display unit 333, hole A frequency characteristic data AF representing the frequency characteristic of the hole A, Hall A reverberation characteristic data AZ representing reverberation characteristics, and Hall A sound source SA, which is a so-called binaurally recorded sound source that is a recording method in which sound is recorded by two microphones attached to the doll's ear (dummy head) in Hall A Is recorded.

  In the hole B data area BD, similarly to the hole A data area AD, hole B image data PB, which is image information schematically representing the hole B displayed on the display unit 333, and a hole representing the frequency characteristics of the hole B are displayed. B frequency characteristic data BF, Hall B reverberation characteristic data BZ representing the reverberation characteristic of Hall B, and Hall B sound source SB, which is a sound source binaurally recorded in Hall B, are recorded.

  In the hole C data area CD, similarly to the hole A data area AD, the hole C image data CA, which is image information schematically representing the hole C displayed on the display unit 333, and the hole C representing the frequency characteristics of the hole C are displayed. C frequency characteristic data CF, Hall C reverberation characteristic data CZ representing the reverberation characteristic of Hall C, and Hall C sound source SC which is a sound source binaurally recorded in Hall C are recorded.

  In the listening room region LR, as described above, the frequency characteristic data LF representing the frequency characteristic of the listening room where the listener has been analyzed by the spatial characteristic analyzing unit 327, the sound pressure level data LL representing the sound pressure level, the delay Delay time data LD representing time and reverberation characteristic data LZ representing reverberation characteristics are recorded as listening room data.

  In the listening room region LR, a frequency characteristic correction coefficient LFC for setting the frequency characteristic of the frequency characteristic adjustment circuit 230, a sound pressure level correction coefficient LLC for setting the signal level of the signal level / delay adjustment unit 240, and The delay characteristic correction coefficient LDC for setting the delay time and the reverberation characteristic correction coefficient LZC for setting the reverberation characteristic of the reverberation control circuit 250 are recorded.

  In the sample sound data area SD, signal processing is performed in the signal processing unit 200 based on the frequency characteristics and reverberation characteristics set by the listener, and from the speaker shim 130 via the D / A converter 322 and the power amplifier 323. Sample sound data SS, which is sound information of the sample sound to be amplified, is recorded.

  Each hole image data mentioned above is processed as follows.

  The hall image data PA in the hall A data area AD is input to the display control unit 332 under the control of the system control unit 329 when the user operates the operation unit 329 to display the hall image. The display control unit 332 processes the hole image data PA so as to display the input hole image data PA on the display unit 333, and outputs the processed hole image data PA to the display unit 333. When the hole image data PA displayed on the display unit 333 is selected by the user using the operation unit 329, the system control unit 329 displays the frequency characteristic data AF and the reverberation characteristic data AZ in the hole A data area AD. The data is read from the storage unit 330 and input to the calculation unit 331.

  Further, the hole image data PB in the hole B data area BD is input to the display control unit 332 under the control of the system control unit 329 in the same manner as the hole A data area AD. The display control unit 332 processes the hole image data PB so that the input hole image data PB is displayed on the display unit 333, and outputs it to the display unit 333. When the hole image data PB displayed on the display unit 333 is selected by the user using the operation unit 329, the system control unit 329 displays the frequency characteristic data BF and the reverberation characteristic data BZ in the hole B data area BD. The data is read from the storage unit 330 and input to the calculation unit 331.

  Further, the hall image data PC in the hall C data area CD is input to the display control section 332 under the control of the system control section 329, similarly to the hall A data area AD. The display control unit 332 processes the hole image data PC so as to display the input hole image data PC on the display unit 333, and outputs the processed hole image data PC to the display unit 333. When the hall image data PC displayed on the display unit 333 is selected by the user using the operation unit 329, the system control unit 329 displays the frequency characteristic data CF and the reverberation characteristic data CZ in the hall C data area CD. The data is read from the storage unit 330 and input to the calculation unit 331.

(II) First Embodiment of the Present Application Next, with reference to FIG. 7, a series of processing operations that allow the user to experience a sense of reality as if listening in a concert hall in a listening room will be described. FIG. 7 is a flowchart showing the operation of this embodiment.

  In step S <b> 11, when the system control unit 329 detects a user operation of the operation unit 328, the system control unit 329 schematically illustrates the hole A image data PA, the hole B image data PB, and the hole C image data PC stored in the storage unit 330. The display control unit 332 is controlled so as to display the hole A image, the hole B image, and the hole C image shown in FIG. 6 on a display unit 333 such as a liquid crystal display device or a plasma display (FIG. 6).

  In step S12, when the system control unit 329 detects that any one of the images displayed in FIG. 6 is selected by the mouse used by the user, the frequency characteristic data and the reverberation characteristic corresponding to the selected hall image. Data is read from the storage unit 330 and the data is input to the calculation unit 331.

  For example, when the hall image data A is selected, the system control unit 329 selects the frequency characteristic data AF and the reverberation characteristic data AZ in the hole A data area AD in the storage unit 330, and calculates those data. Input to the unit 331. The same processing is performed when the hole image data B or the hole image data C is selected.

  In step S <b> 13, the system control unit 329 measures sound field data such as frequency characteristics and reverberation characteristics in the listening room 10. Specifically, the system control unit 329 causes the test signal generation unit 324 to generate a test signal. The system control unit 329 amplifies the generated test signal into the listening room 10 via the signal processing unit 200, the D / A converter 322, the power amplifier 323, and the speaker system 130.

  At this time, the amplified test signal is collected by the microphone 140 installed at the listening position. The collected sound signal is amplified to a preset signal level by the microphone amplifier 325 and output to the A / D converter 326. Then, the A / D converter 326 converts the input sound collection signal from an analog signal to a digital signal, and outputs the sound collection signal converted into the digital signal to the spatial characteristic analysis unit 327.

  After that, the spatial characteristic analysis unit 327 analyzes the frequency characteristic that is the sound field data of the loud sound output for each channel based on the input sound collection signal and the reverberation component based on the instruction of the system control unit 329. Perform analysis. Specifically, the spatial characteristic analysis unit 327 calculates reproduction characteristic data such as frequency characteristic data and reverberation characteristic data in the listening room 10. Then, the system control unit 329 reads the listening room frequency characteristic data LF and the listening room reverberation characteristic data LZ from the spatial characteristic analysis unit 327, and stores them in the listening room region LR in the storage unit 329 via the bus B. Remember.

  In step S <b> 14, the system control unit 329 outputs the listening room frequency characteristic data LF and the listening room reverberation characteristic data LZ of the listening room 10 in the listening room region LR of the storage unit 330 to the calculation unit 331.

  The calculation unit 331 calculates gain, which is gain data for each frequency band, using the frequency characteristic data AF of the hall A and the frequency characteristic data LF of the listening room. Then, the system control unit 329 outputs the calculated gain for each frequency from the calculation unit 331 to the signal processing control unit 260. The signal processing control unit 260 calculates a frequency characteristic correction coefficient LFC corresponding to a coefficient for setting the frequency characteristic of each frequency characteristic adjustment circuit 230 stored in advance in the storage unit 330 based on the input gain for each frequency. Then, the signal is output to the frequency characteristic adjustment circuit 230 provided in each channel, and the frequency characteristic of each frequency characteristic adjustment circuit 230 is set.

  In addition, the calculation unit 331 calculates reverberation characteristics for each frequency band using the hall A reverberation characteristic data AZ and the listening room reverberation characteristic data LZ. Then, the system control unit 329 outputs the calculated reverberation characteristic for each frequency from the calculation unit 331 to the signal processing control unit 260. Based on the input reverberation characteristic data for each frequency, the signal processing control unit 260 calculates a reverberation characteristic correction coefficient LFC corresponding to a coefficient for setting the reverberation characteristic of each reverberation control circuit 250 stored in advance in the storage unit 330. The frequency characteristic is calculated and output to the frequency characteristic adjustment circuit 230 provided in each channel, and the frequency characteristic of each frequency characteristic adjustment circuit 230 is set.

  In step S15, when the system control unit 329 detects that the user has selected “end” using the operation unit 328 (step S15; YES), the system control unit 329 ends this processing. When the system control unit 329 detects that the user has selected “continue” using the operation unit 328 (step S15; NO), the system control unit 329 performs processing on image information such as a hall image. In order to display, the process proceeds to step S11.

  In the present embodiment, the sound field data measurement of the listening room corresponding to step S13 is performed before the sound field correction corresponding to step S14. However, the present invention is not limited to this. For example, it can be performed before displaying the hole image corresponding to step S11. In addition, it is not necessary to measure the sound field data of the listening room every time, and if it is in one listening room, it is sufficient to perform it only once if the installation equipment such as audio equipment in the listening room is not changed. . In this case, the frequency characteristic data and reverberation characteristic data of the listening room stored in the listening room area of the storage unit 330 are used in the calculation of the listening room sound field correction coefficient in step S14. Furthermore, when the user changes the listening position, it is necessary to change the position of the microphone 140 to the position where the user listens and newly measure the sound field data in the listening room corresponding to step S13.

  Also, each hall sound source data stored in each hall data area is stored in the user's headphones (not shown) under the control of the system control unit 329 after the hole image displayed on the display unit 333 is selected. You can also make it louder.

  In the present embodiment, the processing for the frequency characteristic data and the reverberation characteristic data in each hole has been described. However, the sound pressure level data and the delay time data in each hole are processed in the same manner.

(III) Second Embodiment of the Present Embodiment Next, referring to FIG. 8, an embodiment in which a user edits a speaker image displayed on the display unit 333 to freely change the sound volume actually amplified from the speaker. Will be described. In addition, an embodiment will be described in which the user can freely change the delay time of the sound actually amplified by the speaker by editing the speaker image displayed on the display unit 333. FIG. 8 is a flowchart showing the operation of this embodiment.

  In step S <b> 21, when the system control unit 329 detects a user operation of the operation unit 328, the system control unit 329 selects the speaker selected by the operation of the operation unit 328 from the storage unit 330 in which image information schematically representing each speaker is recorded. The image information is output to the display control unit 332. Thereafter, the system control unit 329 controls the display control unit 332 to display the selected speaker image on the display unit 333 such as a liquid crystal display device or a plasma display device. As a result, for example, as shown in FIG. 9, the FL speaker 132FL and the FR speaker 132FR are displayed on the display unit 130.

  In step S <b> 22, when the system control unit 329 detects that the user enlarges the FL speaker 132 FL image displayed on the display unit 130 by operating the mouse, the display control unit 332 is displayed on the display unit 130. Control is performed to enlarge the FL speaker 132FL image (FIG. 9B). In addition, when the system control unit 329 detects that the FL speaker 132FL image displayed on the display unit 130 is reduced by operating the mouse, the system control unit 329 displays the display control unit 332 on the FL speaker displayed on the display unit 130. Control is performed to reduce the 132FL image (not shown).

  For example, by dividing the signal level into several sizes in advance and associating the size of the speaker image displayed on the display unit 333 with the signal level divided in advance, the system control unit 329 makes the speaker An audio signal level corresponding to the size of the image can be generated. Corresponding to the size of the displayed FL speaker 132FL, the target sound pressure level AL of the FL speaker is increased or decreased.

  In step S <b> 23, the system control unit 329 measures a sound pressure level that is sound field data in the listening room 10. Specifically, the system control unit 329 causes the test signal generation unit 324 to generate a test signal. Thereafter, the system control unit 329 amplifies the generated test signal into the listening room 10 via the signal processing unit 200, the D / A converter 322, the power amplifier 323, and the speaker system 130.

  At this time, the amplified test signal is collected by the microphone 140 installed at the listening position. The collected sound signal is amplified to a preset signal level by the microphone amplifier 325 and output to the A / D converter 326. Then, the A / D converter 326 converts the input sound collection signal from an analog signal to a digital signal, and outputs the sound collection signal converted into the digital signal to the spatial characteristic analysis unit 327.

  Thereafter, the spatial characteristic analysis unit 327 analyzes the sound pressure level, which is the sound field data of the loud sound output for each channel, based on the input sound collection signal according to an instruction from the system control unit 329. Specifically, the sound pressure level / delay time analysis unit 327B calculates the reproduction data in the listening room 10. Then, the system control unit 329 outputs the listening room sound pressure level data LL from the spatial characteristic analysis unit 327 and records it in the listening room area LR in the storage unit 330.

  In step S24, the system control unit 329 reads the sound pressure level LL in the listening room area LR in the storage unit 330 shown in FIG. The system control unit 329 inputs the read sound pressure level LL to the calculation unit 331. Further, the system control unit inputs the sound pressure level AL obtained in step 22 to the calculation unit 331. The calculation unit 331 calculates a new sound pressure level correction coefficient LLC from the input sound pressure level LL and sound pressure level AL.

  Thereafter, the system control unit 329 outputs the changed sound pressure level correction coefficient LLC of the listening room from the calculation unit 331, and re-records it as the sound pressure level correction coefficient LLC in the listening room region LR in the storage unit 330. . In addition, the system control unit 329 inputs the changed sound pressure level correction coefficient LLC of the listening room to the signal processing control unit 260. When the signal processing control unit 260 sets the input sound pressure level correction coefficient LLC in the signal level / delay adjustment unit 240, the audio signal level transmitted to each channel is changed by the signal level / delay adjustment unit 240. .

  In step S25, when the system control unit 329 detects that the user has selected “end” using the operation unit 328 (step S25; YES), the system control unit 329 ends this processing. When the system control unit 329 detects that the user has selected “continue” using the operation unit 328 (step S25; NO), the system control unit 329 displays the respective speakers (131, 132FL, 132FR, In order to display a typical speaker on the display device 333 in order to change the sound pressure of 132SL, 132SR, 134), the process proceeds to step S21.

  The present embodiment is not limited to the process of displaying the speaker and changing the volume in step S21. For example, the system control unit 329 displays an image (FIG. 10A) representing the positional relationship between the speaker and the user for changing the time until the amplified sound output from each speaker reaches the user. It is also possible to control the display control unit 332 so that the image is displayed on 333. FIG. 10A is a diagram schematically showing the listening position (RV), the FL speaker 132FL, and the FR speaker 132FR, and the positional relationship between them. C1 represents a circle centered on the listening position (RV). FIG. 10A shows that the FL speaker 132FL and the FR speaker 132FR are equidistant from the listening position (RV).

  In this case, the system control unit 329 monitors the input from the operation unit 328, and based on the input instruction, how much the position of the speaker image selected on the display screen of the display unit 333 is in the horizontal and vertical directions. The calculation unit 331 calculates whether the coordinates have changed. Then, the system control unit 329 causes the calculation unit 331 to calculate the vertical movement distance and the horizontal movement distance of the speaker image in the listening room 10 from the coordinate changes in the horizontal direction and the vertical direction of the speaker image.

  Here, for example, when the user operates the operation unit 328 to select the FR speaker 132 FR image and performs an input operation for determining the position of the movement destination, the system control unit 329 displays the display unit 333. The distance from the coordinates corresponding to the FR speaker 132FR image of FIG. 10A displayed on the screen to the coordinates corresponding to the FR speaker 132FR image of FIG. 10B on the screen of the display unit 333 that is the movement destination. The calculation unit 331 is controlled to calculate. Note that the distance calculation method at this time is arbitrary. For example, the following method can be employed. That is, the coordinates (FIG. 10B) corresponding to the movement destination of the FR speaker 132FR image are (X2, Y2), and the coordinates (FIG. 10A) before the movement of the FR speaker 132FR image are (X1, Y1). )

(Equation 1)
R1 = ((X2-X1) ² + (Y2-Y1) ² ) ^1/2 (Formula 1)
(Where R1 is the distance from the destination of the FR speaker 132FR image on the screen displayed on the display unit 333 to the point before the movement)
Is calculated by the calculation unit 331, and the distance R1 on the display screen of the display unit 333 from the destination of the FR speaker 132FR image to before the movement is calculated.

  Similarly, the system control unit 331 causes the calculation unit 331 to calculate the distance R2 between the position before the movement of the FR speaker 132FR image displayed on the display unit 333 and the listening position (RV).

  Here, the distance R4 between the FR speaker 132FR and the listening position (RV) in the listening room 10 is stored in the storage unit 330 in advance. The system control unit 329 inputs the stored distance R4 between the FR speaker 132FR and the listening position (RV) in the listening room 10 from the storage unit 330 to the calculation unit 330. The calculation unit 330 is configured to measure the distance R1 from the movement destination of the FR speaker 132FR image on the display screen of the display unit 333 to the position before the movement, the position before movement of the FR speaker 132FR image on the display screen of the display unit 333, and the listening position (RV ) And the distance R4 from the FR speaker 132FR to the listening position (RV) in the listening room 10 to the position after the movement in the listening room 10 from the position before the movement of the FR speaker 132FR. The distance R3 is calculated. R3 is

(Equation 2)
R3 = (R1 × R4) / R2 (Formula 2)
Is calculated by The system control unit 329 controls the display control unit 332 so that the distance R3 as the calculation result is displayed in FIG. FIG. 10B is a diagram in which the FR speaker 132FR is brought closer to the listening position from the original position by 50 cm.

  Thereafter, the system control unit 329 calculates the delay coefficient data so that the delay time of the signal level / delay adjustment unit 240FL that delays the sound amplified from the FL speaker 132FL is proportional to the distance difference R1. The system control unit 329 inputs the delay coefficient data calculated by the calculation unit 331 to the signal processing control unit 260. The signal processing control unit sets the input delay coefficient data in the delay circuit FL. As a result, the user at the listening position (RV) can hear the sound amplified from the FR speaker 132FR earlier than the sound amplified from the FL speaker 132FL. Further, in step S24, the user can select the FR speaker 132FR image with the mouse and move the FR speaker 132FR image away from the listening position (RV). In this case, the user at the listening position (RV) can listen to the sound amplified from the FR speaker 132FR later than the sound amplified from the FL speaker 132FL.

  Further, the diagram displayed in step 21 is not limited to the diagram described above, but a diagram representing frequency characteristics of sound field data, a diagram representing phase characteristics, a diagram representing reverberation characteristics, and various types of speakers. It is also possible to represent a chart. In step S24, the user can edit these charts using the mouse. In step S26 or step S28, based on the result edited in step S24, the system control unit 329 causes the calculation unit 331 to calculate frequency characteristics, reverberation characteristics, and the like.

  When the user changes the listening position, the position of the microphone 140 is changed to the position where the user listens, the sound field data measurement of the listening room corresponding to step S11, and the listening room sound field coefficient corresponding to step S12. It is possible to perform new data operations.

(IV) Third Embodiment of the Present Application Next, referring to FIG. 11, in a listening room, when performing a series of processing operations once or a plurality of times to experience a sense of reality as if listening in a concert hall. An embodiment in which an image approximating reverberation characteristic data obtained for each calculation is displayed on the display unit 332 will be described. FIG. 11 is a flowchart showing the operation of this embodiment. Thus, even during the waiting time of the user, by displaying the progress of the calculation on the display unit 332, the user can visually enjoy the waiting time.

  In step S31, upon detecting a user operation of the operation unit 328, the system control unit 329 stores the movie theater image data PM, the large hall image data PB, the small hall image data PS shown in FIG. Based on the image such as the living image data PL, the display control unit 332 is controlled to display any image on the display unit 333 such as a liquid crystal display device or a plasma display.

  In step S32, when the system control unit 329 detects that any one of the images displayed in FIG. 12 is selected by the mouse used by the user, the storage unit 330 stores reverberation characteristic data corresponding to the selected image. And the data is input to the calculation unit 331.

  For example, when movie theater image data PM is selected, the system control unit 329 selects movie theater reverberation characteristic data PZ corresponding to the movie theater image data PM in the storage unit 330, and calculates these data as a calculation unit. Input to 331. The same processing is performed when the large hall image data PB, the small hall image data PS, or the living image data PL is selected.

  In step S <b> 33, the system control unit 329 measures sound field data such as reverberation characteristics in the listening room 10. Specifically, the system control unit 329 causes the test signal generation unit 324 to generate a test signal. The system control unit 329 amplifies the generated test signal into the listening room 10 via the signal processing unit 200, the D / A converter 322, the power amplifier 323, and the speaker system 130.

  At this time, the amplified test signal is collected by the microphone 140 installed at the listening position. The collected sound signal is amplified to a preset signal level by the microphone amplifier 325 and output to the A / D converter 326. Then, the A / D converter 326 converts the input sound collection signal from an analog signal to a digital signal, and outputs the sound collection signal converted into the digital signal to the spatial characteristic analysis unit 327.

  In step 34, the spatial characteristic analysis unit 327 analyzes a reverberation characteristic that is sound field data of a loud sound output for each channel based on the input sound collection signal in accordance with an instruction from the system control unit 329. Specifically, the spatial characteristic analysis unit 327 calculates reverberation characteristic data that is reproduction characteristic data in the listening room 10. Then, the system control unit 329 reads the reverberation characteristic data LZ of the listening room 10 from the spatial characteristic analysis unit 327 and stores it in the listening room region LR in the storage unit 329 via the bus B.

  Further, the system control unit 329 outputs the reverberation characteristic data LZ of the listening room of the listening room 10 in the listening room region LR of the storage unit 330 to the calculation unit 331.

  The computing unit 331 calculates reverberation characteristics for each frequency band using the movie theater reverberation characteristic data PZ and the listening room reverberation characteristic data PZ. Then, the system control unit 329 outputs the calculated reverberation characteristic for each frequency from the calculation unit 331 to the signal processing control unit 260. Based on the input reverberation characteristic data for each frequency, the signal processing control unit 260 calculates a reverberation characteristic correction coefficient LZC corresponding to the coefficient for setting the reverberation characteristic of each reverberation control circuit 250 stored in advance in the storage unit 330. It calculates and outputs to the reverberation control circuit 250 provided in each channel, and sets the reverberation characteristic of each reverberation control circuit 250.

  In step S <b> 35, the system control unit 329 inputs any one of the listening room reverberation characteristic data LZ and the reverberation characteristic data corresponding to each image stored in the storage unit 330 to the calculation unit 331. The computing unit 331 compares and calculates the input listening room reverberation characteristic data LZ and the reverberation characteristic data input from the storage unit 330. The calculation unit 331 performs this comparison calculation operation on reverberation characteristic data corresponding to all image data stored in the storage unit 330. Then, the reverberation characteristic data closest to the listening room reverberation characteristic data LZ is selected from the reverberation characteristic data compared with the listening room reverberation characteristic data LZ.

  For example, for the reverberation time for each frequency band, the calculation unit 331 compares the listening room reverberation characteristic data LZ with any one of the reverberation characteristic data in the storage unit 330, and compares the reverberation time difference for each frequency band. Calculate the integral of. The reverberation characteristic data having the smallest integrated value among the reverberation characteristic data stored in the storage unit 330 can be selected as the reverberation characteristic data approximated to the listening room reverberation characteristic data LZ.

  In step S36, the system control unit 329 controls the display control unit 332 to display on the display unit 333 image data corresponding to the reverberation characteristic data most similar to the listening room reverberation characteristic data LZ selected in step 35. .

  In step 37, when the image displayed on the display unit 333 in step S36 is the same as the image displayed on the display unit 333 in step 31 (step S37: YES), the system control unit 329 End the process. In addition, when the image displayed on the display unit 333 in step S36 is different from the image displayed on the display unit 333 in step 31 (step S37: NO), the system control unit 329 returns to step S33 and calculates in step 34. The reverberation characteristic correction coefficient LZC thus set is set in the reverberation control circuit 250, and the sound field data of the reverberation characteristic in the listening room 10 is measured again.

  Normally, this measurement and comparison calculation process is repeated several times. However, even if this measurement and comparison calculation process is repeated a predetermined number of times, for example, five times, it corresponds to the image displayed on the display unit 333 in step S31. If the reverberation characteristic data measured in the living room 10 is not the closest to the reverberation characteristic data, this process can be forcibly terminated.

  In step S37, the display unit 333 may display how many times the processing from step S33 to step S36 needs to be repeated. Further, by displaying the time required for the remaining processing on the display unit 333 as a numerical value in units of minutes or seconds, the progress of the calculation may be known to the user.

  Further, the system control unit 329 can repeat step S33 to step S36 for each speaker arranged in the listening room 10. In this case, the system control unit 329 displays a schematic diagram of the speaker arranged in the listening room 10 on the display unit 333 in advance, and colors the schematic diagram of the speaker for which calculation has been completed, so that the user can proceed with the calculation. You may make it understand a situation.

Furthermore, the image displayed on the display unit 333 is not limited to an image prepared in advance, and graphics data drawn with a three-dimensional CAD (Computer Aided Design) or the like may be displayed. In this case, since the reverberation characteristic data cannot be measured, the reverberation characteristic data uses a value obtained by simulation. As described above, by storing the CAD design means and the simulation means in the storage unit 330 in advance, the user can freely design image data.

  As described above, when the reverberation characteristic correction coefficient LFC cannot be calculated so as to be closest to the reverberation characteristic data of the image displayed in step S31, the arrangement of furniture in the living room 10 and the curtain that cause the reverberation characteristic correction coefficient LFC are not obtained. The system control unit 329 may display messages corresponding to the presence / absence, presence / absence of an obstacle, noise, and the like on the display unit 333.

  In the present embodiment, the sound field data of the first listening room corresponding to step S33 is measured before the sound field correction corresponding to step S34. However, the present invention is not limited to this. For example, it can be performed before displaying the hole image corresponding to step S31.

  Also, each hall sound source data stored in each hall data area is stored in the user's headphones (not shown) under the control of the system control unit 329 after the hole image displayed on the display unit 333 is selected. You can also make it louder.

(V) Modification 1 of the present application
In the third embodiment of the present application, correction of reverberation characteristics has been described. In this case, the main purpose is to correct the image of the space. In the present modification, a case will be described in which frequency characteristics are corrected by a signal processing circuit such as a so-called equalizer, which is known as an audio device. For example, in this case, the main purpose is to align the timbres of a plurality of speakers. Therefore, a photograph or schematic diagram of a speaker is used as an image such as an icon displayed on the display unit 333.

  The image of the speaker and the frequency characteristic data are stored in the storage unit 330 in association with each other. Before the frequency characteristic in the listening room 10 is corrected, a so-called inexpensive speaker image is displayed on the display unit 333. Thereafter, whenever the frequency characteristic of the listening room is corrected, the speaker image displayed on the display unit 333 is changed to a so-called expensive speaker. For example, the frequency characteristic correction of the listening room is performed several times, and when the correction is completed, a famous speaker photograph or schematic diagram is displayed on the display unit 333.

  The procedure for correcting the frequency characteristics of the listening room 10 will be described below.

  The system control unit 329 causes the test signal generation unit 324 to generate a test signal, and to cause the test signal generation unit 324 to speak up into the listening room 10 via the signal processing unit 200, the D / A converter 322, the power amplifier 323, and the speaker system 130.

  At this time, the amplified test signal is collected by the microphone 140 installed at the listening position, amplified to a preset signal level by the microphone amplifier 325, and then output to the A / D converter 326. Then, the A / D converter 326 converts the input sound collection signal from an analog signal to a digital signal, and outputs the sound collection signal converted into the digital signal to the spatial characteristic analysis unit 327.

  Thereafter, the spatial characteristic analysis unit 327 analyzes the frequency characteristic, which is the sound field data of the loud sound output for each channel, based on the input sound collection signal according to the instruction of the system control unit 329. Specifically, the spatial characteristic analysis unit 327 calculates frequency characteristic data that is reproduction characteristic data in the listening room 10. Then, the system control unit 329 reads the listening room frequency characteristic data LF from the spatial characteristic analysis unit 327 and stores it in the listening room region LR in the storage unit 329 via the bus B.

  Further, the system control unit 329 outputs the frequency characteristic data LF of the listening room of the listening room 10 in the listening room region LR of the storage unit 330 to the calculation unit 331.

  In addition, the calculation unit 331 calculates the frequency characteristic for each frequency band using the frequency characteristic data corresponding to the expensive speaker and the listening room frequency characteristic data LF. Then, the system control unit 329 outputs the calculated frequency characteristic for each frequency from the calculation unit 331 to the signal processing control unit 260. The signal processing control unit 260, based on the input frequency characteristic data for each frequency, a frequency characteristic correction coefficient LFC corresponding to a coefficient for setting the frequency characteristic of each frequency characteristic adjustment circuit 230 stored in advance in the storage unit 330. Is output to the frequency characteristic adjustment circuit 230 provided in each channel, and the frequency characteristic of each frequency characteristic adjustment circuit 230 is set.

  Then, the system control unit 329 reads an image of a speaker having a frequency characteristic approximate to the frequency characteristic analyzed by the spatial characteristic analysis unit 327 from the storage unit 330 and displays the speaker image on the display unit 332. If necessary, the frequency characteristics are further corrected.

  In this way, the frequency characteristic of the listening room is corrected as many times as necessary.

  Accordingly, the user can visually recognize how the speaker image displayed on the display unit 333 is changed from a small inexpensive speaker to a large expensive speaker as the listening room 10 is corrected. Thus, since the image of the speaker or the like displayed on the display unit 333 is changed even during the waiting time during correction, the state can be enjoyed visually and the waiting time does not matter.

(VI) Modification 2 of the present application
In this modification, a case will be described in which time delay correction is performed in order to equalize the time until speaker sounds amplified from a plurality of speakers provided in the listening room 10 reach the user.

  When performing time delay, the display unit 333 displays how far each speaker is from the user who is the listener, so that the user can easily understand the progress of the time delay correction, and the user desires When the speaker displayed on the display unit 333 is moved to the position to be moved via the operation unit 328, the system control unit 329 delays the sound amplified from the speaker based on the amount of movement.

  FIG. 14 shows the distance relationship between the four speakers displayed on the display unit 333 and the user who is the listener.

  RV represents the listening position, C3 represents a concentric circle located 1 m from the listening position, and C4 represents a concentric circle located 2 m from the listening position. FIG. 14 shows a state in which the FL speaker 132FL, the FR speaker 132FR, the RL speaker 132RL, and the RR speaker 132RR are moved on the concentric circle C4 of 2 m from the listening position by operating the operation unit 328 by the user. The FR speaker 132FR was initially displayed between the concentric circle C3 and the concentric circle C4, but the operation of moving the user over the concentric circle C4 that is a distance of 2 m from the listening position by the user operating the operation unit 328 is shown in FIG. It is expressed.

  In this way, the system control unit 329 controls the generation timing of the speaker sound that is amplified from each speaker so that each speaker is amplified at a distance of 2 m from the listening position.

  The procedure for correcting the delay time characteristic of the listening room 10 will be described below with reference to FIG.

  In step S <b> 41, the system control unit 329 displays an image (FIG. 14) representing the positional relationship between the speaker and the user for changing the time until the loud sound output from each speaker reaches the user. The display control unit 332 is controlled so as to be displayed. FIG. 14 is a diagram schematically showing the listening position (RV), the FL speaker 132FL, the FR speaker 132FR, the RL speaker 132RL, and the RR speaker, and their positional relationship. It shows that each speaker is equidistant from the listening position (RV).

  In step 42, the system control unit 329 monitors the input from the operation unit 328, and based on the input instruction, the position of the speaker image selected on the display screen of the display unit 333 is determined in the horizontal direction and the vertical direction. The calculation unit 331 calculates whether the coordinates have changed to the extent. Then, the system control unit 329 causes the calculation unit 331 to calculate the vertical movement distance and the horizontal movement distance of the speaker image in the listening room 10 from the coordinate changes in the horizontal direction and the vertical direction of the speaker image.

  Here, for example, when the user operates the operation unit 328 to select the FR speaker 132 FR image and performs an input operation for determining the position of the movement destination, the system control unit 329 displays the display unit 333. Calculation is performed so as to calculate the distance from the coordinates corresponding to the FR speaker 132FR image of FIG. 14 displayed on the screen to the coordinates corresponding to the FR speaker 132FR image of FIG. 14 on the screen of the display unit 333 that is the movement destination. The unit 331 is controlled.

  The distance displayed on the display unit 333 is the time until the sound that is amplified from each speaker reaches the user at the listening position (RV) based on the speed of sound in the air previously input to the storage unit 330. Can be represented.

  In step 43, the system control unit 329 causes the test signal generation unit 324 to generate a test signal, and the signal processing unit 200, the D / A converter 322, the power amplifier 323, and the speaker system 130 are passed through any one speaker. To make it loud in the listening room 10.

  At this time, the amplified test signal is collected by the microphone 140 installed at the listening position, amplified to a preset signal level by the microphone amplifier 325, and then output to the A / D converter 326. Then, the A / D converter 326 converts the input sound collection signal from an analog signal to a digital signal, and outputs the sound collection signal converted into the digital signal to the spatial characteristic analysis unit 327.

  In step 44, the spatial characteristic analysis unit 327 determines, based on an instruction from the system control unit 329, between the generation timing of the loud sound output for each channel and the timing at which the microphone 14 collects sound based on the input sound collection signal. Calculate the time difference. Then, the system control unit 329 reads the listening room delay time data LD from the spatial characteristic analysis unit 327 and stores it in the listening room region LR in the storage unit 329 via the bus B.

  Then, system control unit 329 outputs the calculated delay time data for each speaker from calculation unit 331 to signal processing control unit 260. The signal processing control unit 260 calculates a delay characteristic correction coefficient LFC for each speaker based on the input delay time data, and outputs the delay characteristic correction coefficient LFC to the signal level / delay adjustment unit 240 provided for each channel. The delay time of the delay adjustment unit 240 is set.

    For example, the time delay amount to be set for each speaker is set with reference to the speaker having the longest arrival time, that is, the speaker farthest from the listening position RV among the time until the sound amplified from each speaker arrives at the microphone 14. You may make it do.

  In step 45, the system control unit 329 determines the listener for each speaker based on the delay time data for each speaker calculated by the spatial characteristic analysis unit 327 and the sound speed in the air previously input to the storage unit 330. The calculation unit 331 calculates the distance (RV). Then, each speaker is moved as a distance between each speaker and the listener (RV) on the display unit 333 based on the calculated result. In addition, the speaker displayed on the display unit 333 corresponding to the corrected speaker is colored so that the user can easily understand the progress of the correction visually.

  In step 46, when the delay time of each speaker corresponding to the positional relationship between the listener (RV) set in step 42 and each speaker is obtained (step 46: YES), the series of processing ends. . If the delay time of each speaker corresponding to the positional relationship between the listener (RV) set in step 42 and each speaker cannot be obtained (step 46: NO), the process returns to step 43 and delay time correction processing is performed. repeat.

  As described above, the positional relationship between the listening position (RV) and the speaker and the speaker are colored on the display unit 333, so that the user can easily understand the progress of correction visually.

(VII) Modification 3 of the present application
In this modification, when adjusting the volume level of a speaker that is loudened from a plurality of speakers provided in the listening room 10, the volume of the loudspeaker that is loudly displayed from the speaker on the display unit 333 is schematically shown. A modification will be described in which the user can visually grasp the volume of sound output from the speaker in correspondence with the size.

  A procedure for correcting the sound pressure level characteristic of the listening room 10 will be described below.

  The system control unit 329 causes the test signal generation unit 324 to generate a test signal and listens to the listening room 10 via one of the speakers of the signal processing unit 200, the D / A converter 322, the power amplifier 323, and the speaker system 130. Make a loud voice inside.

  At this time, the amplified test signal is collected by the microphone 140 installed at the listening position, amplified to a preset signal level by the microphone amplifier 325, and then output to the A / D converter 326. Then, the A / D converter 326 converts the input sound collection signal from an analog signal to a digital signal, and outputs the sound collection signal converted into the digital signal to the spatial characteristic analysis unit 327.

  Thereafter, the spatial characteristic analysis unit 327 analyzes the sound pressure level of the loud sound output for each channel based on the input sound collection signal in accordance with an instruction from the system control unit 329. Specifically, the sound pressure level / delay time analysis unit 327B calculates the reproduction data in the listening room 10. Then, the system control unit 329 outputs the listening room sound pressure level data LL for each channel from the spatial characteristic analysis unit 327 and records it in the listening room region LR in the storage unit 330.

  Thereafter, the system control unit 329 reads the sound pressure level LL in the listening room area LR in the storage unit 330 shown in FIG. The system control unit 329 inputs the read sound pressure level LL to the calculation unit 331. Further, the system control unit inputs the sound pressure level UL set by the user to the calculation unit 331. The computing unit 331 computes a new sound pressure level correction coefficient LLC from the input sound pressure level LL and sound pressure level UL.

  Thereafter, the system control unit 329 outputs the changed sound pressure level correction coefficient LLC of the listening room from the calculation unit 331, and re-records it as the sound pressure level correction coefficient LLC in the listening room region LR in the storage unit 330. . In addition, the system control unit 329 inputs the changed sound pressure level correction coefficient LLC of the listening room to the signal processing control unit 260. When the signal processing control unit 260 sets the input sound pressure level correction coefficient LLC in the signal level / delay adjustment unit 240, the audio signal level transmitted to each channel is changed by the signal level / delay adjustment unit 240. .

  In this case, the system control unit 332 changes the size of the speaker displayed on the display unit 333 according to the sound pressure level of each speaker.

  The above sound pressure adjustment processing is executed until the sound pressure of each speaker becomes equal. In addition to equalizing the sound pressure of all speakers, the target may be set according to the user's preference at the start of correction, such as raising the front speaker by 3 dB compared to the rear.

  Therefore, in the middle of the correction, the user can visually grasp how the size of the speaker displayed on the display unit 333 changes. In addition, the speaker displayed on the display unit 333 corresponding to the speaker for which the sound pressure correction has been completed is colored so that the user can easily understand the progress of the correction visually. As described above, the surround system 100 of the present embodiment is installed in the listening room 10 and the test signal unit 324 that measures the spatial characteristics such as the frequency characteristics and reverberation characteristics of the sound that is amplified in the listening room 10. Sound field data measuring means provided with an A converter 322, a power amplifier 323, a speaker system 130, a microphone amplifier 325, an A / D converter 326, a spatial characteristic analysis unit 327, and the like, and a sound field space such as various hall images are displayed. A display control unit 130 for controlling the display unit 333 such as a liquid crystal display device or a plasma display, and an operation unit such as a mouse for selecting various hole images displayed on the liquid crystal display device or the plasma display display unit 333 328, display screens of various holes, etc. and frequency characteristic data which is target data of various holes. And a storage unit 330 storing the relation with reverberation characteristic data, frequency characteristic data, sound pressure level / delay time characteristic data, and reverberation characteristic data, which are target data such as various holes selected by a mouse or the like, Generate new listening room frequency characteristic correction coefficient LFC, sound pressure level correction coefficient LLC, delay characteristic correction coefficient LDC, and reverberation characteristic correction coefficient LZC based on the sound field measurement data of the listening room measured by the sound field data measuring means. Based on the system control unit 329 as a generation means for generating, and the frequency characteristic correction coefficient LFC, sound pressure level correction coefficient LLC, delay characteristic correction coefficient LDC, and reverberation characteristic correction coefficient LZC of the new listening room generated by the system control unit 329 , Sample sound data SS and sound source output Reproducing means such as an input processing unit 121 and a signal processing unit 200 for reproducing sound input from the device 110, and outputs of a D / A converter 322 and a power amplifier 323 for outputting information reproduced by the reproducing unit. And means.

  According to this configuration, the user does not need to perform a complicated operation of inputting various characteristic data of the music hall sound field data numerically. On the other hand, a sound effect similar to that played in a specific music hall or performance hall can be obtained in the sound field space used by the user. That is, in a space such as a home room, a space such as a music hall can be easily set, and a sense of reality similar to that heard in a space such as a music hall can be obtained.

  In addition, the surround system 100 according to the present embodiment includes a chart representing the frequency characteristics of the sound field data, a chart representing the phase characteristics, a chart representing the reverberation characteristics, and various types of speakers on a display unit such as a liquid crystal display device or a plasma display. The figure showing the size of the speaker or the figure showing the positional relationship between the speaker and the user is displayed. After the information related to the target data is displayed on the display device, the target data is selected by the user selecting desired information displayed on the display device. It is also possible to listen to the sound source with headphones in the sound field for selection. As a result, the target sound field can be confirmed by ear.

  Sound is reproduced based on the selected target data.

  According to this configuration, various acoustic characteristics can be adjusted through vision, and the user can more easily and intuitively adjust the acoustic environment in a space such as a home room by using a binaural sound source. You will be able to choose.

  Furthermore, the surround system 100 according to the present embodiment moves and edits at least a part of the speaker image selected by the mouse along with the movement of the mouse, enlarges the speaker image, or changes the positional relationship between the speaker and the user. Can do. The speaker image edited in this way can be used as the target data described above, and based on the edited speaker, the frequency characteristic correction coefficient LFC and the sound pressure level of the listening room set in advance for determining the sound to be amplified from the speaker. The calculation unit 331 converts the correction coefficient LLC, delay characteristic correction coefficient LDC, or reverberation characteristic correction coefficient LZC into a new listening room frequency characteristic correction coefficient LFC sound pressure level correction coefficient LLC, delay characteristic correction coefficient LDC, or reverberation characteristic correction coefficient LZC. Calculate as Based on the calculated frequency characteristic correction coefficient LFC of the listening room, the signal processing control unit 260 controls the frequency characteristic adjustment circuit 230 to change the frequency characteristic of the sound that is output from the speaker system 130. Further, the signal processing control unit 260 controls the signal level / delay adjustment unit 240 based on the calculated sound pressure level correction coefficient LLC and delay characteristic correction coefficient LDC, and the signal level or delay time of the sound that is output from the speaker system 130 To change. Further, the signal processing control unit 260 controls the reverberation control circuit 250 based on the calculated reverberation characteristic correction coefficient LZC of the listening room, and changes the reverberation characteristic of the sound amplified from the speaker system 130.

  According to this configuration, for example, when adjusting the sound pressure level between the speakers, a plurality of speakers are displayed on the display screen, and the size of the speakers is changed by an instruction from a mouse or a keyboard. It is possible to change the sound pressure level. For example, when changing the distance from the speaker to the user, a diagram related to the positional relationship between the speaker and the user is displayed on the screen, and the distance between the two is changed by an instruction from the mouse or keyboard. Accordingly, it is possible to change the time of sound reaching the user from the speaker.

  Furthermore, the surround system 100 according to the present embodiment stores the frequency, the intensity of the frequency, the time of the reverberant sound, the intensity of the reverberant sound, and the delay time until the output sound from the output unit reaches the user in the storage unit 330. Information related to at least one of them is recorded. The signal processing unit 200 includes at least one of a frequency characteristic adjusting circuit 230, a signal level / delay adjusting unit 240, and a reverberation control circuit 250 that can adjust a frequency characteristic for each finely divided frequency band. Yes.

  According to this configuration, it is possible to divide the sound output from one output means into a plurality of frequency bands and adjust the sound intensity for each frequency band. Therefore, it becomes possible to finely control the frequency characteristics peculiar to each space, and it is easy to correct the frequency characteristics of one space to the frequency characteristics of another space. You will be able to get a sense of realism in the space of your home room.

    In addition, since it is possible to adjust the time for the sound output from one output means and the sound output from the other output means to reach the user, the delay time of the direct sound can be corrected. It becomes possible.

  In addition, since the reverberation time for each frequency band can be controlled, the sound generated in the sound field is repeatedly reflected on the surrounding walls and ceiling to control the reverberation characteristics unique to the sound field that forms a complex sound field. It becomes possible to do. That is, the reverberation characteristic of one sound field can be easily reproduced in a space such as a room at home which is another sound field.

  Furthermore, in the present embodiment surround system 100, when information related to a sound field space such as a hall and a speaker is displayed on the liquid crystal display device or the plasma display, the user uses the mouse to sound the hall and the speaker. When information related to the field space is selected, the binaural sound source corresponding to each image can be reproduced from the headphones and confirmed by the ear.

  According to this configuration, it is possible to easily check on the spot how the sound reproduced in the music hall or the like desired by the user can be heard. In other words, if the sound that the user is trying to play does not play as the user wants, search other music halls immediately and select the music hall that has the acoustic characteristics that the user wants to hear Can be redone.

  Furthermore, the surround system 100 of the present embodiment includes sound field data such as reverberation characteristics, frequency characteristics, delay time characteristics, and sound pressure level characteristics associated with image information such as a hall that the user desires to view and a test signal unit 324. , Reverberation characteristics, frequency characteristics measured by sound field data measurement means including a D / A converter 322, a power amplifier 323, a speaker system 130, a microphone amplifier 325, an A / D converter 326, a spatial characteristic analysis unit 327, and the like. Comparison operation means such as an operation unit 331 for comparing and calculating sound field data such as delay time characteristics and sound pressure level characteristics, and holes stored in the storage means such as the storage unit 330 based on the result of the comparison operation. Extraction means such as a system control unit 329 for extracting image information such as.

  According to this configuration, when the sound field measurement is started, an image such as a sound field space such as a target hall, the positional relationship of the speakers, and the size of the speaker indicating the sound pressure level amplified from the speakers is displayed. It represents not only the sound field data measured by the sound field data measuring means, but also the sound field space such as a hall corresponding to the sound field data in the middle of the process, the positional relationship of the speakers, and the sound pressure level amplified from the speakers. An image such as the size of the speaker can be displayed. Accordingly, the waiting time during correction close to the target data can be enjoyed by visually observing an image showing the progress on the way displayed on a display device such as a liquid crystal display device or a plasma display.

  In the present embodiment, the information displayed on the liquid crystal display device or the plasma display has been described mainly with reference to charts. However, the present application is not limited to these, and the frequency (Hz) and signal level (dB) representing frequency characteristics are not limited thereto. ) Can be entered numerically. Also, the frequency (Hz) and the delay time (ms) representing the reverberation characteristics can be input numerically.

  Further, in the present embodiment, the hall and the like indicating the sound field space and the chart representing the sound field data such as the speaker have been separately described, but the present application is not limited to these, and the liquid crystal display device or the plasma display is not limited thereto. Sound field data such as a hall indicating a sound field space and sound field data such as a speaker may be displayed together so that sound field data can be edited and playback sound can be confirmed.

Further, when the sound field data of the speaker or the like is corrected, if the sound field data in the hall or the like indicating the preset sound field space is equal to or close to the value, the holes or the like are displayed on the screen. You may do it.

Claims (11)

Playback means for playing back the sound to be played back;
Sound field data measuring means for measuring sound field data in a space where the sound is amplified,
Display control means for controlling display means for displaying image information relating to a predetermined space;
Selection means for selecting the image information displayed on the display means;
Storage means for storing the image information and sound field data of the predetermined space in association with each other;
A sound field for controlling information reproduced from the reproduction means based on target data which is target data related to the information selected by the selection means and sound field measurement data measured by the sound field data measurement means Generating means for generating control information;
Output control means for controlling the output of information reproduced by the reproduction means, and
The sound reproducing system, wherein the reproducing means reproduces a sound to be reproduced based on the sound field control information generated by the generating means. The sound reproduction system according to claim 1,
The sound reproduction system according to claim 1, wherein the storage means stores image information related to the target data as image information displayed on the display means. The stereophonic sound system according to claim 1 or 2,
Display state changing means for moving at least part of the image information selected by the selection means together with movement of the selection means, and changing the display state of the image information;
Transfer means for transferring the image information changed by the display state changing means to the display control means;
Calculating means for calculating target data based on the image information changed by the display state changing means;
Further comprising
The generation means controls the sound field based on the sound field data related to the information selected by the selection means, the sound field measurement data measured by the sound field data measurement means, and the target data calculated by the calculation means. A sound reproduction system characterized by generating information. The sound reproduction system according to any one of claims 1 to 3,
The sound field measurement data includes a frequency characteristic in the sound field, a reverberation characteristic in the sound field, a delay time until the reproduced sound from the reproducing means reaches the user, or a sound pressure level of the reproduced sound from the reproducing means. At least one of them,
The sound field data measurement means includes at least one of frequency analysis means, sound pressure level measurement means, time measurement means, and reverberation characteristic measurement means,
The sound reproduction system according to claim 1, wherein the reproduction means includes at least one of frequency characteristic adjustment means, level adjustment means, delay means, and reverberation characteristic adjustment means. The sound reproduction system according to any one of claims 1 to 4,
Storage means for storing the sound to be reproduced;
Further comprising
When the information based on the target data is selected by the selection unit, a sound to be reproduced related to the information stored in the storage unit is reproduced. The sound reproduction system according to any one of claims 1 to 5,
The sound reproduction system according to claim 1, wherein the sound reproduced by the reproduction means is at least one of a sound acquired from the outside and a sound stored by the storage means. The sound reproduction system according to any one of claims 1 to 6,
Comparison operation means for comparing and calculating the sound field data associated with the image information and the sound field data measured by the sound field data measurement means,
Extraction means for extracting image information stored in the storage means based on the result of the comparison operation;
A sound reproduction system, further comprising: The sound reproduction system according to claim 7,
The sound reproduction system, wherein the sound field data has reverberation characteristics. The sound reproduction system according to claim 7,
The sound reproduction system, wherein the sound field data has frequency characteristics. The sound reproduction system according to claim 7,
The sound reproduction system, wherein the sound field data is a sound pressure level. The sound reproduction system according to claim 7,
The sound reproduction system, wherein the sound field data has time delay characteristics.

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