JP2007259391A - Audio system, mobile information processing device, audio device, and acoustic field correction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device by which a user can omit a labor hour managing a microphone for acoustic field measurement and an acoustic field correction method. <P>SOLUTION: An installed microphone of a mobile telephone 20 is used as a microphone. Data concerning the detection audio of the installed microphone are transmitted from the mobile telephone 20 to a receiver 15 by wireless communication such as infra-red radiation communication. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an audio system, a portable information processing device, an audio device, and a sound field correction method for calculating a correction value of an audio signal for performing a sound field measurement and generating a desired sound field at a listening position. It is.

Patent Document 1 discloses an audio system that calculates a correction value such as a delay time for the audio signal of each channel so that the audio output from each speaker of the speaker system generates a sound field suitable for the listening position. In the audio system, in order to calculate a correction value, a microphone is arranged at a listening position, and environmental noise is detected by the microphone, and test audio is detected from each speaker in order to detect the test audio at the listening position. ing.
JP 2002-330500 A

  In the audio system of Patent Document 1, a microphone is required to calculate a correction value, and a manufacturer needs to bundle a sound field measurement microphone with the audio system, or a user needs to purchase a microphone separately. Furthermore, prior to the sound field measurement, the user needs to connect the microphone to the audio device with a cable.

  An object of the present invention is to provide an audio system, a portable information processing device, an audio device, and a sound field correction method that can save the user from having to manage a microphone for measuring a sound field.

  An audio system of the present invention includes a portable information processing device including a communication unit, an audio signal generation unit that generates audio signals of a plurality of channels, and a speaker system that outputs audio based on the audio signal from the audio signal generation unit. And an audio device having at least communication means capable of communicating with the portable information processing device.

The portable information processing apparatus of the present invention includes the following elements.
A microphone that detects audio from the audio device,
Communication means capable of transmitting and receiving data to and from the communication means of the audio device, and control means for transmitting data related to the audio detected by the microphone to the communication means of the audio device by the communication means.

The audio apparatus of the present invention includes the following elements.
Communication means for receiving data related to audio detected by the microphone of the portable information processing apparatus from the portable information processing apparatus, and correction means for correcting an audio signal based on the received data related to audio.

The sound field correction method of the present invention includes the following steps.
Detecting audio from the audio device with a microphone of the portable information processing device;
A step of transmitting and receiving data related to audio detected by the microphone from the portable information processing device to the audio device by each communication; and a method for each channel of the audio device based on the audio data received by the audio device from the portable information processing device. Correcting the audio signal;

  According to the present invention, since the microphone of the portable information processing apparatus such as a mobile phone is used as a microphone for measuring a sound field, the user can omit the complicated management and search of the microphone and face the sound field measurement work. And the troublesomeness of the work can be reduced.

  FIG. 1 shows the state of equipment and arrangement of the AV system 10. The AV system 10 is arranged in an audio room 11 and includes a receiver 15, a monitor 16, a speaker system 17, and a mobile phone 20. The mobile phone 20 is a component of the AV system 10 only during the sound field measurement period, but is not a dedicated component of the AV system 10 and is the original mobile phone independent of the AV system 10 except during the sound field measurement. Can be used as. The receiver 15 and the mobile phone 20 can exchange data with each other by wireless communication such as Bluetooth or infrared communication.

  The speaker system 17 is equipped with speakers FL, C, FR, SL, SR, and SW. The speakers SL and SR are called surround speakers. The speaker SW is called a subwoofer. The position of the monitor 16 and each speaker in the audio room 11 when the viewing position is set substantially at the center of the audio room 11 will be described with respect to the viewing position.

  The monitor 16 is arranged at the front center of the user at the viewing position. The speakers FL and FR are respectively arranged on the left and right of the monitor 16, and the speaker C is arranged in front of the user at the viewing position. The speakers SL and SR are arranged on the left and right sides of the user at the viewing position in the audio room 11 or on the diagonally left and right sides, respectively. The speaker SW is arranged at an arbitrary position.

  FIG. 2 is a block diagram of the mobile phone 20. The cellular phone 20 includes an application chip 21, a baseband chip 22, a built-in speaker 23, a built-in microphone 24, a key input unit 25, and a display unit 26. The built-in speaker 23 outputs audio related to the audio signal from the application chip 21. The built-in microphone 24 picks up the audio, converts it into an electric signal, and sends it to the application chip 21. The key input unit 25 is equipped with a numeric keypad operated by the user and sends a signal related to the operated key to the application chip 21. The display unit 26 includes a liquid crystal display device and the like, and displays an image related to an image signal from the application chip 21.

  The application chip 21 is further connected with an infrared communication circuit unit 30, a memory card module 32, and a camera module 33. The infrared communication circuit unit 30 communicates with other infrared communication devices via the antenna 31 using infrared rays. The memory card module 32 is detachably attached to the mobile phone 20 and stores predetermined information in a readable and writable manner. The camera module 33 is used for taking a picture.

  Further, a data memory 36 and an SDRAM (Synchronous DRAM) 37 are connected to the application chip 21. The data memory 36 is a non-volatile memory, and stores predetermined data used by the CPU (not shown) of the application chip 21 when executing the application. The SDRAM 37 is used as a main storage device of the CPU of the application chip 21.

  The baseband chip 22 can transmit and receive data to and from the application chip 21, and a CDMA (Code Division Multiple Access) circuit unit 40 and a Bluetooth module 42 are connected to the baseband chip 22. The CDMA circuit unit 40 transmits / receives information related to calls and data to / from a telephone company base station via an antenna 41. The Bluetooth module 42 transmits and receives data to and from nearby electronic devices via the antenna 43.

  FIG. 3 is a flowchart of the automatic sound field correction function. The automatic sound field correction function is to arrange a microphone at the listening position in order to optimize the sound field at the listening position (viewing position in the AV system 10), and to measure environmental noise and measurement sound from each speaker by the microphone. Pickup is performed, and the correction value of the audio signal of each channel is calculated based on the data of the picked up audio.

  FIG. 4 is a sequence diagram of the automatic sound field correction function. In FIG. 4, a mobile phone 20 and a receiver 15 transmit and receive data via Bluetooth communication or infrared communication. A specific process of the automatic sound field correction function will be described with reference to FIGS.

  When the user operates a predetermined key of the mobile phone 20, the automatic sound field correction function starts. An automatic sound field correction start request is sent from the mobile phone 20 to the receiver 15 (K71). In response to this, an OK / NG (possible / impossible) reply message is sent from the receiver 15 to the mobile phone 20 (K72). If the response message is OK, the process proceeds to the subsequent processes, and if it is NG, an error is displayed on the display unit 26 of the mobile phone 20 and the process ends (K73).

  Next, a request message for measurement noise A is sent from the cellular phone 20 to the receiver 15 (K74). Thereafter, the cellular phone 20 starts recording with the built-in microphone 24 (K75), and the receiver 15 outputs the measurement noise A from a predetermined speaker (K75). When the predetermined time has elapsed, the receiver 15 sends a message that the output of the measurement noise A has been completed to the mobile phone 20 (K77). Accordingly, the cellular phone 20 stops recording by the built-in microphone 24 (K78) and sends a recording data to the receiver 15 (K79).

  Based on the microphone recording data received from the mobile phone 20, the receiver 15 analyzes the presence / absence of a speaker that is currently measured, analyzes the appropriate level of the output volume of the speaker, and analyzes the acoustic characteristics of the environment. (K80). Upon completion of these analyses, an analysis end message is sent from the receiver 15 to the mobile phone 20 (K81). Next, the speakers are set in the next order, and K74 to K81 are repeated until the last speaker in the order (K82). The order of the speakers is, for example, FL → FR → C → SL → SR → SW.

  The processes of K74 to K81 correspond to the processes of S50 to S53 in FIG. In S50 to S53, the analysis of the appropriate speaker level is not performed in the analysis of K80, and the analysis of the appropriate speaker level is performed in S62.

  In S45, automatic sound field measurement is started. In S46, the Lch speaker (FL) is set as the variable Xch, and in S50, predetermined noise (measurement noise A) is output from the speaker corresponding to Xch. Thereafter, in S51, it is determined whether or not the built-in microphone 24 has detected noise. If it is detected, it is determined in S52 that the Xch speaker is connected (there is an Xch speaker). In S53, it is determined that the Xch speaker is not connected (no Xch speaker).

  The process of K82 corresponds to the processes of S54 to S56 in FIG. That is, in S54, it is determined whether or not the speaker set to Xch is the last one in the order. If the determination is positive, in S55, the Lch speaker having the first order in Xch is set. Then, it progresses to the sound field measurement after S60. If the determination in S54 is negative, in S56, the speaker with the next turn is set for Xch.

  In FIG. 4, after K82, a request message for measurement noise B is sent from the mobile phone 20 to the receiver 15 (K83). In the mobile phone 20, the delay time measurement timer starts counting and the input audio edge interrupt to the built-in microphone 24 is permitted (K 84). On the other hand, the receiver 15 outputs measurement noise B from a predetermined speaker (K85).

  When the mobile phone 20 detects an edge interrupt of the input audio to the built-in microphone 24, the timer 20 stops counting and prohibits the edge interrupt (K86). The cellular phone 20 transmits the timer count data to the receiver 15 (K87). On the other hand, the receiver 15 analyzes the speaker distance based on the received count data (K88).

  Upon completion of the speaker distance analysis, the receiver 15 transmits an analysis end message to the mobile phone 20 (K89). The processing from K83 to K89 is repeated for all speaker channels (K90). When the analysis is completed for all the speaker channels, an automatic sound field correction end message is transmitted from the receiver 15 to the mobile phone 20 (K91).

  The processes K83 to K88 correspond to the processes S61 to S63 in FIG. In S61, it is determined whether or not an Xch speaker is connected (whether or not an Xch speaker is present), and only when the determination is positive, S62 and S63 are executed. In S62, in order to set the level of the audio output from the Xch speaker, the built-in microphone 24 sets the currently measured audio level to the array variable Level [Xch]. In S63, the count data of K87 in FIG. 4 is set to another array variable Dist [Xch] for distance setting.

  Level [Xch] is used for calculating a correction value related to the level of the audio signal of each channel in order to harmonize the level of the audio signal of each channel and to optimize the volume from each speaker at the viewing position. The array variable Dist [Xch] is used to calculate the correction value of the delay time of the audio signal of each channel for optimizing the arrival time of audio from each speaker at the viewing position.

  The processes of K89 to K91 correspond to the processes of S64 and S65 in FIG. In S64, it is determined whether the Xch speaker is the last speaker in the order. If the determination is positive, the automatic sound field correction function is terminated. If the determination in S64 is negative, in S65, the next speaker in the order is set for Xch, and then the process returns to S61.

  FIG. 5 is a configuration diagram of the audio system 100. The audio system 100 includes a portable information processing device 110 and an audio device 130. The AV system 10 (FIG. 1) described above is a specific example of the audio system 100. The audio system 100 may be an audio system provided as a component of the AV system, instead of a dedicated audio system. The speaker system 17 and the mobile phone 20 of the AV system 10 are specific examples of the audio device 130 and the portable information processing device 110, respectively.

  In general, sound field measurement is performed in order to optimize the sound field at the listening position in the room. In order to cope with this, a known audio system is arranged at a predetermined listening position during a sound field measurement period, and a microphone for detecting the audio at the listening position, and an audio signal generating unit (for example, generating an audio signal of each channel) 1) and a speaker system (eg, speaker system 17 in FIG. 1) that outputs audio based on the audio signal from the audio signal generator, and based on the detected audio of the microphone during the sound field measurement period. The correction value of the audio signal is calculated. In the audio system 100, the microphone 111 of the portable information processing apparatus 110 is used as a microphone.

  The portable information processing apparatus 110 includes a microphone 111, a communication unit 112, and a control unit 113. The microphone 111 detects audio at the listening position. The communication unit 112 can exchange data with the communication unit 131 of the audio device 130. The control unit 113 causes the communication unit 112 to transmit data related to the audio detected by the built-in microphone to the communication unit 131 of the audio device 130 during the sound field measurement period.

  The microphone 111 is typically a built-in microphone of the portable information processing apparatus 110, but may be a microphone externally attached to the portable information processing apparatus 110 as appropriate. The communication means 112 and 131 are typically wireless communication means. The wireless communication is, for example, Bluetooth or infrared communication.

  The portable information processing apparatus 110 is typically a mobile phone, but is not limited to this, and any other PDA (Personal Digital Assistants), notebook PC, etc., provided that the microphone 111 and the communication means 112 are provided. (PC: personal computer), portable game machine, digital audio player with voice recording function, or IC recorder.

  In this way, the user can perform the sound field measurement of the audio system 100 using the portable information processing device 110 that is usually placed around the user, instead of the microphone that is rarely used, thereby eliminating the trouble of searching for the microphone. Thus, the sound field measurement can be performed efficiently.

  In order for the portable information processing apparatus 110 to be involved in the sound field measurement of the audio system 100, the portable information processing apparatus 110 normally requires the sound field measurement program 117. In a general portable information processing apparatus 110, the sound field measurement program 117 is not installed at the beginning of purchase. In order to cope with this, the portable information processing device 110 downloads and installs the sound field measurement program 117 from the audio device 130 itself or the website of the manufacturer of the audio device 130 prior to the sound field measurement. Can do. It is preferable that the installed audio device 130 can be uninstalled after the sound field measurement is completed in order to secure the memory capacity of the portable information processing device 110.

  In order to cope with this, the portable information processing apparatus 110 can further include an installation unit 118. The installation unit 118 downloads and installs the sound field measurement program 117 from the audio device 130 via the communication unit 112. The control means 113 operates based on the installed sound field measurement program 117.

  The portable information processing apparatus 110 typically includes a display unit 121 as in the case where it is the cellular phone 20 (FIG. 1), for example. The control means 113 causes the display means 121 to display information related to sound field measurement during the sound field measurement period. The information related to the sound field measurement displayed on the display unit 121 includes, for example, a detection signal by the microphone 111 measured by the portable information processing device 110, and the end of the sound field measurement received from the audio device 130 using the communication unit 112. Information regarding the remaining time, the sound field measurement to be performed again, and / or the audio signal correction value in the audio device 130.

  Note that the sound field measurement sometimes becomes an error and needs to be re-executed depending on circumstances. Displaying information related to re-implementation of the sound field measurement on the display unit 121 is useful as notification information to the user.

  The portable information processing apparatus 110 includes a memory for data (preferably a nonvolatile memory). The memory is, for example, a memory card attached to the memory card module 32 in the mobile phone 20 (FIG. 1). The memory of the portable information processing apparatus 110 can function as the data storage unit 123. The data storage unit 123 stores data related to audio detected by the microphone 111 at the time of sound field measurement as sound field measurement data. Then, the control unit 113 causes the communication unit 112 to transmit the stored sound field measurement data to the communication unit 131 of the audio device 130 as appropriate.

  Thereby, when the user wants to omit the sound field measurement, the sound field measurement data stored in the data storage unit 123 is transmitted to the audio device 130, and the sound field measurement data is actually executed this time. Measurement data can be substituted.

  The sound field measurement data stored in the data storage unit 123 can be created and stored in association with a plurality of cases. That is, the environmental noise may be different depending on the time of the day or the difference between weekdays and holidays. In addition, depending on the user's mood, it may be desirable to change the listening position from front to back and left and right as appropriate. Therefore, for each case, the sound field measurement data is stored, and the sound field measurement data in the past sound field measurement whose environment and conditions are the same as or similar to those of the current case are transferred from the portable information processing device 110 to the audio device 130. Therefore, the audio device 130 can calculate an appropriate correction value.

  The sound field measurement data stored in the data storage unit 123 can be created and stored for each audio device 130. That is, there are cases where there are separate audio devices 130 in a plurality of rooms in one home, or there are separate audio devices 130 in a plurality of homes such as homes and villas. In that case, the audio equipment 130 may have different speaker installation status, room size, environmental noise, and listening position. Therefore, it is possible to store the sound field measurement data for each audio device 130 and send the sound field measurement data associated with the current audio device 130 from the portable information processing device 110 to the audio device 130. .

  The audio device 130 includes a communication unit 131 and a correction unit 132. The communication unit 131 receives data relating to the audio detected by the microphone 111 of the portable information processing apparatus 110 from the portable information processing apparatus 110. The correcting unit 132 corrects the audio signal based on the received data relating to the detected audio.

  The correction value is, for example, a correction value related to the delay time of the audio signal of each channel, a correction value related to the audio signal level between channels, a correction value related to the equalizer processing for the audio signal of each channel, and / or a correction related to the tone. Value.

  FIG. 6 is a flowchart of the sound field correction method 140. The sound field correction method 140 is applied to the audio system 100, for example. In S141, the audio at the listening position is detected by the microphone 111 of the portable information processing apparatus 110 arranged at the listening position during the sound field measurement period.

  In S <b> 142, data related to audio detected by the microphone 111 is transmitted from the portable information processing apparatus 110 to the audio apparatus 130. In S143, the audio device 130 calculates a correction value of the audio signal of each channel of the audio device 130 based on the audio-related data received from the portable information processing device 110.

  The specific example applied to the audio system 100 described with respect to the audio system 100 can be a specific example of the sound field correction method 140 as it is.

  For example, it is possible to add a step of downloading and installing the sound field measurement program 117 from the audio device 130 or the website of the manufacturer of the audio device 130 to the portable information processing device 110 before S141. In this case, S141 to S143 are executed based on the sound field measurement program 117.

  In parallel with S141 to S143, a step of causing the display unit 121 to display information related to sound field measurement during the sound field measurement period may be added.

  A step of storing data relating to the audio detected by the microphone 111 during the sound field measurement period as sound field measurement data may be added to the data storage unit 123. Then, a step for transmitting the stored sound field measurement data to the communication unit 131 of the audio device 130 through the communication unit 112 is added as appropriate, and the sound field measurement is omitted when it is necessary to execute the next sound field measurement. Can do.

  Although the present invention has been described with respect to the best mode, the present invention is not limited to this, and each constituent element in the best mode can be modified and embodied without departing from the gist of the invention. In addition, a plurality of constituent elements disclosed in the best mode are conveniently combined and added, or some constituent elements are deleted to form various inventions without departing from the gist of the invention. can do. Furthermore, various inventions can be formed by selecting predetermined components among a plurality of disclosed embodiments and combining them.

It is a figure which shows the state of the installation and arrangement | positioning of AV system. It is a block diagram of a mobile phone. It is a flowchart of an automatic sound field correction function. It is a sequence diagram in an automatic sound field correction function. It is a block diagram of an audio system. It is a flowchart of the sound field correction method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100: Audio system, 110: Portable information processing apparatus, 111: Microphone, 112: Communication means, 113: Control means, 117: Sound field measurement program, 118: Installation means, 121: Display means, 123: Data storage means 130: Audio device 131: Communication means 132: Correction means 140: Sound field correction method

Claims (7)

A portable information processing apparatus including a communication unit; an audio signal generating unit that generates audio signals of a plurality of channels; a speaker system that outputs audio based on the audio signal from the audio signal generating unit; and at least the portable information processing An audio device comprising communication means capable of communicating with the device;
In an audio system consisting of
The portable information processing apparatus includes:
A microphone that detects audio output from a speaker system in the audio device; and a control unit that transmits data related to the audio detected by the microphone to the communication unit of the audio device by the communication unit;
With
The audio device is
Communication means for receiving data related to the audio transmitted from the communication means by the communication means of the portable information processing apparatus; and correction means for correcting the audio signal based on the received data related to the audio;
An audio system comprising: A microphone that detects audio from the audio device,
Communication means capable of transmitting and receiving data to and from the communication means of the audio device; and control means for transmitting data related to audio detected by the microphone to the communication means of the audio device by the communication means;
A portable information processing apparatus comprising: Installation means for downloading and installing a sound field measurement program by the communication means; and the control means that operates based on the installed sound field measurement program;
The portable information processing apparatus according to claim 2, further comprising: Furthermore, a display means is provided,
4. The portable information processing apparatus according to claim 2, wherein the display means displays data relating to the audio or a correction result relating to the audio acquired from the audio apparatus by the communication means. Data storage means for storing data relating to audio detected by the microphone;
The control means for transmitting the data stored in the data storage means by the control means to the communication means of the audio device by the communication means;
The portable information processing apparatus according to any one of claims 2 to 4, further comprising: Communication means for receiving data relating to audio detected by a microphone of the portable information processing device from any one of the portable information processing devices according to any one of claims 2 to 5, and an audio signal based on the received data relating to the audio Correction means for correcting
An audio device comprising: Detecting audio from the audio device with a microphone of the portable information processing device;
Transmitting and receiving data relating to audio detected by the microphone from the portable information processing device to the audio device by respective communication; and the audio based on data relating to audio received by the audio device from the portable information processing device. Correcting the audio signal of each channel of the device;
A sound field correction method comprising:

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