JP2013213889A - Sound correction device, voice output device, sound correction circuit, sound correction method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound correction device capable of sound correction based on noise sound having no sound output from a voice output device mixed therein, the voice output device, a sound correction circuit, a sound correction method, and a program.SOLUTION: A noise sound input unit 201 starts collecting a noise sound that is an external environmental sound when a sound output from an audio device 100 is in a silent state, and stops collecting the noise sound when the sound output from the audio device 100 is in a non-silent state. A processing unit 204D performs sound correction to an audio signal to be output on the basis of the collected noise sound every time the noise sound input unit 201 collects noise sound.

Description

  The present invention relates to an acoustic correction device, an audio output device, an acoustic correction circuit, an acoustic correction method, and a program.

  An audio device having a so-called noise canceller function that reduces external noises by collecting external environmental sounds (hereinafter referred to as noise sounds) using a microphone and outputting sounds obtained by inverting the phase of the collected noise sounds. And headphones. In addition, there is an audio apparatus having a so-called auto volume function that automatically corrects the volume based on the collected noise sound.

  Conventionally, a microphone collects audio playback sound output from a speaker included in an audio device (hereinafter, sound output from the speaker is referred to as audio playback sound) and noise, and audio playback sound and noise collected by the microphone are collected. The noise sound is detected by subtracting the audio sound from the sound mixed with the sound.

  However, an audio sound (hereinafter, a sound before being output from a speaker is referred to as an audio sound) is distorted and changes in level when output from the speaker. Therefore, even if the sound quality and volume are corrected using the noise sound detected by the method as described above, the expected effect cannot be obtained.

  As a solution to this problem, for example, Patent Document 1 discloses a change in the sampling value of an audio signal with respect to the sampling value at the immediately preceding sampling timing (whether the sampling value has increased or decreased), and detection of vehicle interior sound. Compare the sampling value of the signal with the sampling value at the previous sampling timing and output the number of sampling values with different direction of change as the degree of noise component (filling degree). A method for determining a sound volume correction value by using it has been proposed.

Japanese Patent Laid-Open No. 5-227587

  However, in the method proposed in Patent Document 1, the degree of the noise component is estimated based on the number of sampling values in which the direction of change in the sampling value of the audio signal and the in-vehicle sound detection signal is different. The change in the sampling value due to cannot be captured. Further, since the level of the audio sound changes when it is output from the speaker, it is difficult to detect the degree (filling degree) of the noise component only by changing the sampling value.

The present invention has been made in view of the above circumstances, and an acoustic correction device capable of performing acoustic correction based on a noise sound that is not mixed with a sound output from a sound output device that outputs a sound such as music or voice. An object is to provide an output device, an acoustic correction circuit, an acoustic correction method, and a program.

  In addition, the present invention provides an acoustic correction device, a sound output device, and a sound output device that can collect a noise sound that is not mixed with sound output from the sound output device, even while the sound output device is outputting sound. An object is to provide an acoustic correction circuit, an acoustic correction method, and a program.

In order to achieve the above object, an acoustic correction apparatus according to the first aspect of the present invention includes:
A noise input unit that picks up the noise that is external environmental sound;
Of the noise sounds collected by the noise sound input unit, the sound output by the sound output device is sounded based on the noise sound collected while the sound output from the sound output device is silent. A processing unit to be corrected;
Comprising
It is characterized by that.

In this case, a determination unit that determines whether the sound output from the audio output device is a silent state or a silent state;
When the sound output from the sound output device is determined to be silent by the determination unit, the noise sound input unit is instructed to start collecting noise sound, and the determination unit When it is determined that the sound output from the sound output device is in a silent state again, a first noise sound collection for instructing the noise sound input unit to end the collection of the noise sound. A sound indicator;
Further comprising
It is good as well.

And a 0-bit detector that detects whether or not each bit of the serial digital data constituting the audio signal sequentially input from the audio output device is a 0 bit having a value of 0,
The determination unit determines that the sound output from the audio output device is silent when the 0-bit detection unit continuously detects 0 bits, and the 0-bit detection unit determines that the sound other than the 0-bit When a bit is detected, it is determined that there is no silence.
It is good as well.

In addition, when the number of 0 bits continuously detected by the 0-bit detection unit exceeds a preset threshold, the determination unit determines that the sound output from the audio output device is silent. Judge that there is
It is good as well.

In addition, an analog-to-digital converter that samples the noise sound collected by the noise sound input unit and converts the sampling data into a digital signal by sequentially encoding the data,
A determination unit for determining whether the sound output from the audio output device is a silent state or a non-silent state;
If it is determined by the determination unit that the sound output from the audio output device is in the silent state, it is determined that the sound is in the next silent state after it is determined that the sound is in the silent state. A 0 data overwriting unit that replaces the sampling data encoded by the analog-digital converter with 0 data,
Further comprising
The processing unit acoustically corrects the sound output by the audio output device based on the noise sound of the portion that has not been replaced with 0 data by the 0 data overwrite unit.
It is good as well.

The audio output device has a media playback function,
When detecting that the audio output device has finished reproducing the media, the noise sound input unit is instructed to start collecting noise sound, and after a predetermined time has elapsed from the instruction to start collecting noise sound, A second noise sound collection instruction unit that instructs the noise sound input unit to end the collection of the noise sound;
It is good as well.

And a control unit that controls the audio output device to play the next media after the predetermined time has elapsed from the instruction to start collecting the noise sound by the second noise sound collection instruction unit.
It is good as well.

The audio output device has a function of receiving radio waves and outputting a sound restored by demodulating the received radio waves,
A received radio wave intensity measuring unit for measuring the received radio wave intensity;
When the reception intensity measured by the received radio field intensity measurement unit falls below a preset threshold, the noise sound input unit is instructed to start collecting a noise sound, and measured by the received radio field intensity measurement unit When the received intensity is again equal to or greater than the threshold, a third noise sound collection instruction unit that instructs the noise sound input unit to end the collection of the noise sound;
Further comprising
It is good as well.

Further, when the reception intensity measured by the received radio field intensity measurement unit falls below a preset threshold value, the audio output device is controlled to stop the sound output and measured by the received radio field intensity measurement unit. When the reception intensity is again equal to or higher than the threshold, the audio output device is further controlled, and a control unit that resumes sound output is further provided.
It is good as well.

In order to achieve the above object, an audio output device according to the second aspect of the present invention provides:
A noise input unit that picks up the noise that is external environmental sound;
Among the noise sounds collected by the noise sound input unit, a processing unit that acoustically corrects the output sound based on the noise sound collected while the output sound is silent.
Comprising
It is characterized by that.

In order to achieve the above object, an acoustic correction circuit according to a third aspect of the present invention includes:
A noise input unit that picks up the noise that is external environmental sound;
Of the noise sounds collected by the noise sound input unit, the sound output by the sound output device is sounded based on the noise sound collected while the sound output from the sound output device is silent. A processing unit to be corrected;
Comprising
It is characterized by that.

In order to achieve the above object, an acoustic correction method according to a fourth aspect of the present invention includes:
Picks up noise that is external environmental sound,
Of the collected noise sound, the sound output from the sound output device is acoustically corrected based on the noise sound collected while the sound output from the sound output device is silent.
It is characterized by that.

In order to achieve the above object, a program according to the fifth aspect of the present invention provides:
To a computer having a function of correcting the sound output by the audio output device,
Processing to pick up noise that is external environmental sound,
A process for acoustically correcting the sound output from the sound output device based on the noise sound collected while the sound output from the sound output device is silent during the collected noise sound; ,
To execute,
It is characterized by that.

  ADVANTAGE OF THE INVENTION According to this invention, the acoustic correction based on the noise sound which is not mixed with the sound output from the audio | voice output apparatus is attained.

1 is a functional block diagram showing a configuration of an audio system in Embodiment 1. FIG. It is a figure which shows the flowchart of the noise sound collection process in Embodiment 1. FIG. It is a figure which shows the flowchart of an acoustic correction process. FIG. 6 is a functional block diagram showing a configuration of an audio system in Embodiment 2. FIG. 10 is a diagram schematically showing an operation of a 0 data overwrite unit in the second embodiment. FIG. 10 is a diagram illustrating a flowchart of noise sound collection processing in the second embodiment. FIG. 10 is a diagram illustrating a flowchart of a silent state detection process in the second embodiment. FIG. 10 is a functional block diagram illustrating a configuration of an audio system in a third embodiment. FIG. 10 is a diagram illustrating a flowchart of noise sound collection processing in the third embodiment. FIG. 10 is a functional block diagram illustrating a configuration of an audio system in a fourth embodiment. FIG. 10 is a diagram illustrating a flowchart of noise sound collection processing in the fourth embodiment. It is a figure which shows the flowchart of the noise sound collection process in the modification 1.

  An audio system according to a preferred embodiment of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing the configuration of the audio system 1. The audio system 1 according to the present embodiment includes an audio device 100 and a sound correction device 200. The audio device 100 adjusts the output volume (volume) of audio sound based on a control signal SG1 from the sound correction device 200. Perform acoustic correction, such as frequency equalization.

  As shown in FIG. 1, the audio device 100 includes an input unit 101, an audio playback unit 102, a D / A (Digital / Analogue Converter) 103, an AMP (Amplifer) 104, a speaker 105, and a control unit 106. For example, an audio signal of a sound source selected by the user by operating the operation unit 107 is converted into a sound such as music or voice and output from the speaker 105 to the external space.

  The input unit 101 outputs from an antenna, a reception module for receiving radio such as FM (Frequency Modulation) and AM (Amplitude Modulation), and television broadcasting such as one-segment broadcasting, and a media player such as a CD (Compact Disc) player. An input interface to which audio signals to be input are input. The input unit 101 includes an A / D converter. The analog signal is converted into a digital signal and then output to the audio reproduction unit 102.

  The audio playback unit 102 selects an audio signal input source, that is, a sound source, under the control of the control unit 106, and performs frequency equalization and output volume adjustment on the audio signal input from the input unit 101. Acoustic signal processing (acoustic correction processing) is performed. Then, the audio signal subjected to the acoustic signal processing (acoustic correction processing) is output to the D / A 103 and also output to the acoustic correction device 200.

  The D / A 103 converts the audio signal input from the audio playback unit 102 into an analog signal and outputs the analog signal to the AMP 104.

  The AMP 104 amplifies the analog audio signal analog-converted by the D / A 103 and outputs it to the speaker 105. The speaker 105 converts the analog audio signal input from the AMP 104 into a sound such as music or voice and outputs the sound to an external space.

  The control unit 106 includes an internal memory including a CPU (Central Processing Unit), a ROM (Read-Only Memory), a RAM (Random Access Memory), a flash memory, and the like, and an operation program stored in the internal memory. By executing the above, control processing is performed on each functional unit of the audio device 100. Further, whenever the control unit 106 receives the control signal SG1 from the acoustic correction device 200, the control unit 106 controls the audio reproduction unit 102 based on the received control signal SG1, and performs frequency equalizing processing on the audio signal and adjustment of the output volume. Acoustic signal processing (acoustic correction processing) such as processing is executed.

  The operation unit 107 includes operation keys including switches, a cross key, a joystick, and operators such as a digitizer arranged on the display screen. When the user operates the operation unit 107, an operation signal corresponding to the operation content is output to the control unit 106, and the control unit 106 executes processing corresponding to the output operation signal.

  As shown in FIG. 1, the acoustic correction apparatus 200 includes a noise sound input unit 201, an A / D 202, a storage unit 203, a control unit 204, an operation unit 205, and the like. Based on the audible external environmental sound (hereinafter referred to as noise sound), a control signal SG1 for correcting (sound correction) the volume sound quality to the audio device 100 is transmitted.

  The noise sound input unit 201 includes a microphone, a microphone amplifier, and the like, and starts collecting noise sound by the microphone according to instructions from the control unit 204, strictly speaking, a noise sound collection instruction unit 204B described later. End the sound. Then, the collected noise sound is amplified and output to the A / D 202.

  The A / D 202 converts the noise sound input from the noise sound input unit 201 into a digital signal and outputs the digital signal to the control unit 204. Specifically, the A / D 202 samples a noise sound (analog signal) input from the noise sound input unit 201, quantizes each sampled data, and then encodes it to convert it into a digital signal. . Here, the noise sound converted into the digital signal is hereinafter referred to as a noise signal.

  The storage unit 203 includes a ROM, a RAM, a flash memory, and the like, and includes a CPU work space provided in the control unit 204 described later, a program area for storing various programs such as operation programs, and a data area for temporarily storing noise signals. Function as. The data area stores a 0-bit counter threshold value which will be described later.

  The control unit 204 executes an operation program stored in the storage unit 203 and realizes functions as a 0-bit detection unit 204A, a noise sound collection instruction unit 204B, a determination unit 204C, and a processing unit 204D. Then, various processes such as a control process and a noise sound collecting process described later are performed on each functional unit of the acoustic correction apparatus 100.

  The 0-bit detection unit 204A includes a 0-bit counter C1, and the bit value is “0” in order from the first bit of the (digital) audio signal input from the audio playback unit 102 of the audio device 100 (hereinafter referred to as 0 bit). Each time it is determined that the consecutive bits are 0 bits, the 0-bit counter C1 is incremented. On the other hand, when a bit having a bit value “1” is detected, the 0-bit counter C1 is initialized.

  The 0-bit counter C1 is a counter for managing how many 0 bits of the audio signal are continuous. For example, when a part of the audio signal is (1, 1, 0, 0, 0, 1) The 0-bit detection unit 204A determines that there are 0 bits three times in succession, and the counter value k of the 0-bit counter C1 when the third 0 bit is detected is “3”. The initial setting value of the 0-bit counter C1 is “1”.

  When the determination unit 204C determines that the count value k of the 0-bit counter C1 has exceeded the 0-bit counter threshold, the noise sound collection instruction unit 204B collects the noise sound to the noise sound input unit 201. Instruct. When the determination unit 204C determines that the 0-bit counter threshold has been exceeded and then determines that the 0-bit counter C1 has been initialized, the noise sound collection support unit 204B Instructing the end of noise noise collection.

  Whether the determination unit 204C is in a silent state by determining whether or not the counter value k of the 0-bit counter C1 exceeds a 0-bit counter threshold (for example, 128) stored in the storage unit 203 in advance. Determine whether or not. The determination unit 204C determines whether or not the 0-bit counter C1 is initialized after determining that the counter value k of the 0-bit counter C1 exceeds the 0-bit counter threshold. That is, the determination unit 204C determines whether or not the silent state has changed to the silent state.

Each time the noise sound collected by the noise sound input unit 201 is input from the A / D 202, the processing unit 204D analyzes, for example, the acoustic power or acoustic power level of the noise sound, and based on the analysis result, A control signal SG1 for adjusting the output volume is generated, and the generated control signal SG1 is transmitted to the audio device 100 via a communication unit (not shown). Further, for example, the processing unit 204D analyzes the frequency characteristics of the noise sound, generates a control signal SG1 for frequency equalizing the frequency band buried in the noise sound based on the analysis result, and passes through a communication unit (not shown). Then, the generated control signal SG1 is transmitted to the audio apparatus 100.
It should be noted that conventional techniques can be used for the analysis of the sound power and sound power level of the noise sound and the analysis of the frequency characteristics of the noise sound.

  The operation unit 205 includes operation keys including switches, a cross key, a joystick, and an operator such as a digitizer arranged on the display screen. When the user operates the operation unit 205, an operation signal corresponding to the operation content is output to the control unit 204, and the control unit 204 executes processing corresponding to the output operation signal.

  Next, with reference to FIG. 2, the flow of noise sound collection processing in the present embodiment will be described. This noise sound collection processing is started when an audio signal is input from the audio playback unit 102 of the audio device 100 to the sound correction device 200 as a trigger.

  The 0-bit detection unit 204A determines whether or not it is 0 bits in order from the first bit of the audio signal input from the audio playback unit 102 (step S101). If it is determined that the bit is not 0 bit (step S101; NO) ), The 0-bit detection unit 204A initializes the 0-bit counter C1 (step S102), the process returns to the process of step S101, and the above-described process is repeated.

  On the other hand, if it is determined that the bit is 0 (step S101; YES), the 0-bit detector 204A determines whether the next bit is 0 (step S103). When it is determined that the next bit is not 0 bit (step S103; NO), the 0-bit detection unit 204A initializes the 0-bit counter C1 (step S102), and the process returns to the process of step S101. Repeat the process. On the other hand, when it is determined that the next bit is also 0 bit (step S103; YES), the 0-bit detector 204A increments the 0-bit counter C1 (step S104).

  Then, the determination unit 204C determines whether or not the counter value k of the 0-bit counter C1 has exceeded the 0-bit counter threshold (step S105).

  When it is determined that the counter value k of the 0-bit counter C1 is equal to or less than the 0-bit counter threshold (step S105; NO), the process returns to the process of step S103, and the above-described process is repeated. On the other hand, when it is determined that the counter value k of the 0-bit counter C1 exceeds the 0-bit counter threshold value, that is, when it is determined that the silent state has been reached (step S105; YES), a noise sound collection instruction is given. The unit 204B instructs the noise sound input unit 201 to collect a noise sound (step S106).

  Then, the noise sound input unit 201 instructed to collect the noise sound from the noise sound collection instruction unit 204B starts to collect the noise sound using the microphone included in the noise sound input unit 201 (step S107). . The noise sound collected by the microphone is amplified and output to the A / D 202. The noise sound input from the noise sound input unit 201 is digitized by the A / D 202 and output to the control unit 204.

  Then, the determination unit 204C determines whether or not the 0-bit counter C1 has been initialized by the 0-bit detection unit 204A (step S108). When it is determined that the 0-bit counter C1 has not been initialized, that is, when it is determined that the silent state continues (step S108; NO), the process returns to the process of step S107, and the silence is performed. Wait for the state to change to silence. Meanwhile, the noise sound input unit 201 continues to collect noise sounds.

  On the other hand, when it is determined that the 0-bit counter C1 is initialized, that is, when the silent state is changed to the silent state (step S108; YES), the noise sound collection instruction unit 204B The input unit 201 is instructed to end the collection of the noise sound (step S109). The noise input unit 201, which is instructed to end the collection of the noise sound from the noise sound collection instruction unit 204B, ends the collection of the noise sound by the microphone (step S110). And a process returns to the process of step S101 and repeats the above-mentioned process.

  Next, with reference to FIG. 3, the flow of the acoustic correction process in the present embodiment will be described. This sound correction process is started when a noise sound collection instruction is issued from the noise sound collection instruction unit 204B.

  The noise sound input unit 201 starts collecting a noise sound according to an instruction from the noise sound collection instruction unit 204B (step S201). The noise sound collected by the noise sound input unit 201 is amplified and output to the A / D 202.

  Then, the A / D 202 converts the noise sound input from the noise sound input unit 201 into a digital signal (step S202). The noise signal converted into the digital signal is output to the control unit 204.

  Then, the processing unit 204D performs an analysis process on the noise signal input from the A / D 202 (step S203). For example, the processing unit 204D analyzes the sound power and sound power level of the noise sound. Further, for example, the frequency characteristics of noise sound are analyzed.

  Then, the processing unit 204D generates a control signal SG1 for causing the audio reproduction unit 102 to perform acoustic signal processing (acoustic correction processing) based on the analysis result in step S203, and performs communication (not shown). The control signal SG1 is transmitted to the control unit 106 of the audio apparatus 100 via the unit (step S204). The control unit 106 of the audio apparatus 100 controls the audio reproduction unit 102 based on the control signal SG1 transmitted from the processing unit 204D, and performs acoustic signal processing (acoustic correction processing) on the audio signal, for example, output volume adjustment processing. And frequency equalizing processing in a frequency band buried in noise sound.

  According to the first embodiment, the 0-bit detection unit 204A detects 0 bits of the audio signal, and the determination unit 204C determines that the number of consecutive 0 bits is a 0-bit counter based on the counter value k of the 0-bit counter C1. By determining whether or not a threshold value has been exceeded, it is determined whether or not a silent state has been reached. When it is determined that a silent state has been reached, the noise sound collection instruction unit 204B The instruction to start collecting the noise sound was output. In addition, when the 0-bit counter C1 is initialized after it has been determined that the sound has been silenced, that is, when the sound has been silenced, the noise sound collection instruction unit 204B receives the noise sound input unit 201. An instruction to end the collection of noise sound was output. In this way, even during playback, when the sound becomes silent, the noise sound is picked up, and acoustic correction is performed based on the picked up noise sound, so that it can respond to the changing noise sound. In addition, it is possible to perform acoustic correction such as output volume adjustment processing and frequency equalizing a frequency band buried in noise sound. Further, even when the audio device 100 is outputting audio playback sound from the speaker 105, it is possible to detect a silence state, and in the silence state, a noise sound is collected, so that the volume can be adjusted more effectively. In addition, acoustic correction such as frequency equalizing becomes possible.

(Embodiment 2)
In the first embodiment, when the determination unit 204C determines that the counter value k of the 0-bit counter C1 exceeds the 0-bit counter threshold value, that is, in the silent state, the noise sound collection instruction unit 204B Outputs a noise sound collection start instruction to the noise sound input unit 201, and the noise sound input unit 201 starts collecting the noise sound according to the sound collection start instruction. When the determination unit 204C determines that the 0-bit counter C1 has been initialized, that is, when the silent state is entered, the noise sound collection instruction unit 204B An instruction to end the collection of the noise sound is output, and the noise sound input unit 201 ends the collection of the noise sound in accordance with the instruction to end the sound collection.

  In the present embodiment, the noise sound input unit 201 continuously collects noise sounds. Then, the encoded sampling data of the noise sound sequentially input from the A / D 202 is overwritten with 0 data until the silence state is detected, and when the silence state is detected, the encoded sampling data is set to 0. When the process of overwriting with data is stopped and the silent state is canceled, the process of overwriting the encoded sampling data with 0 data is resumed.

  As shown in FIG. 4, the audio system 1 according to the present embodiment has the same basic configuration as that of the first embodiment. However, the control unit 204 of the acoustic correction apparatus 200 includes a silent state detection unit 204E and a zero data overwrite unit 204F instead of the noise sound collection instruction unit 204B. Further, the functions performed by the noise sound input unit 201, the determination unit 204C, and the processing unit 204D are slightly different from those in the first embodiment.

  The noise sound input unit 201 starts collecting a noise sound when the power of the sound correction device 200 is turned on or a sound collection instruction is given by the user via the operation unit 205, and the power of the sound correction device 200 is turned on. When the sound collection end instruction is given by the user via OFF or the operation unit 205, the noise sound collection ends.

  The determination unit 204C determines whether or not the counter value k of the 0-bit counter C1 exceeds a 0-bit counter threshold value (for example, 128) stored in advance in the storage unit 203. The determination unit 204C determines whether or not the 0-bit counter C1 is initialized after determining that the counter value k of the 0-bit counter C1 exceeds the 0-bit counter threshold. Further, the determination unit 204C determines whether or not the silence state detection unit 204E detects a silence state.

  The processing unit 204D analyzes the noise signal after the noise sound part collected in the silent state by the 0 data overwriting unit 204F is overwritten with 0 data. Specifically, every time a noise signal (data other than 0 data) collected in a silent state is input, the noise signal of that portion is analyzed, and an audio signal is sent to the audio playback unit 102 based on the analysis result. A control signal SG1 for executing processing (acoustic correction processing) is generated, and the generated control signal SG1 is transmitted to the audio device 100 via a communication unit (not shown). The process 204D analyzes, for example, the acoustic power or acoustic power level of the noise sound, and generates a control signal SG1 for adjusting the output volume based on the analysis result. Further, for example, the processing unit 204D analyzes the frequency characteristics of the noise sound and generates the control signal SG1 for frequency equalizing the frequency band buried in the noise sound based on the analysis result.

  The silence state detection unit 204E detects the silence state when the determination unit 204C determines that the counter value K of the 0-bit counter C1 exceeds the 0-bit counter threshold value. If the determination unit 204C determines that the 0-bit counter C1 has been initialized after determining that the 0-bit counter threshold has been exceeded, the silence state detection unit 204E cancels the silence state.

  The zero data overwriting unit 204F overwrites the encoded sampling data of the noise sound sequentially input from the A / D 202 with zero data until the silent state detection unit 204E detects a silent state. When the silence state detection unit 204E detects a silence state, the process of overwriting the encoded sampling data with 0 data is stopped until the silence state is canceled by the silence state detection unit 204E.

  Here, with reference to FIG. 5, the operation of the 0 data overwrite unit 204F will be described based on a specific example. FIG. 5 is a diagram schematically illustrating a state in which the sampling data encoded by the 0 data overwrite unit 204F is overwritten with 0 data.

  SPi (i = 1, 2,...) Indicates encoded sampling data, and is output from the A / D 202 in ascending order of the code i. In the example of FIG. 5, the silence state detection unit 204E detects a silence state between SP3 and SP4, the silence state detection unit 204E cancels the silence state between SP10 and SP11, and again the silence state between SP16 and SP17. The detection unit 204E detects a silent state. The 0 data overwriting unit 204F overwrites SP1 to SP3 with 0 data until a silent state is detected, and since a silent state is detected between SP3 and SP4, the 0 data overwriting process is stopped. Since the silence state is canceled between SP10 and SP11, the 0 data overwrite unit 204F overwrites SP11 to SP16 with 0 data until the silence state is detected again, and between SP16 and SP17. Since the silent state is detected, the zero data overwriting process is stopped. By doing so, the processing unit 204D can perform acoustic signal processing (acoustic correction processing) based on the noise sound collected in the silent state.

  Next, with reference to FIG. 6, the flow of noise sound collection processing in the present embodiment will be described. This noise sound collection processing is started when the sound correction apparatus 200 is turned on or a sound collection instruction is given by the user via the operation unit 205.

  The noise sound input unit 201 starts collecting a noise sound (step S301). The collected noise sound is amplified and output to the A / D 202. Then, the A / D 202 sequentially converts the input noise sound into a digital signal (noise signal), and sequentially outputs the noise signal (encoded sampling data) to the control unit 204.

  The determination unit 204C determines whether or not the silence state detection unit 204E detects a silence state (step S302). When it is determined that the silence state detection unit 204E detects a silence state (step S302; YES), the 0 data overwrite unit 204F performs coded sampling of noise sounds sequentially input from the A / D 202. Stop overwriting data with 0 data (step S303).

  On the other hand, if it is determined that the silence state detection unit 204E has not detected the silence state, that is, if it is determined that the silence state detection unit 204E is releasing the silence state (step S302; NO) The zero data overwriting unit 204F starts overwriting the encoded sampling data of the noise sound sequentially input from the A / D 202 with zero data (step S304).

  Next, with reference to FIG. 7, the flow of the silence state detection process by the silence state detection unit 204E will be described.

  The 0-bit detection unit 204A determines whether or not it is 0 bits in order from the first bit of the audio signal input from the audio playback unit 102 (step S401), and determines that it is not 0 bit (step S401; NO) ), The 0-bit detection unit 204A initializes the 0-bit counter C1 (step S402), the process returns to the process of step S401, and the above-described process is repeated.

  On the other hand, if it is determined that the bit is 0 (step S401; YES), the 0-bit detector 204A determines whether the next bit is 0 (step S403). If it is determined that the next bit is not 0 bit (step S403; NO), the 0-bit detector 204A initializes the 0-bit counter C1 (step S402), and the process returns to the process of step S401. Repeat the process. On the other hand, if it is determined that the next bit is also 0 bit (step S403; YES), the 0-bit detector 204A increments the 0-bit counter C1 (step S404).

  Then, the determination unit 204C determines whether or not the counter value k of the 0-bit counter C1 has exceeded the 0-bit counter threshold (step S405).

  When it is determined that the counter value k of the 0-bit counter C1 is equal to or less than the 0-bit counter threshold (step S405; NO), the process returns to the process of step S403, and the above-described process is repeated. On the other hand, if it is determined that the counter value k of the 0-bit counter C1 exceeds the 0-bit counter threshold (step S405; YES), the silence state detection unit 204E detects a silence state (step S406).

  Then, the 0-bit detection unit 204A determines whether the next bit is 0 bit (step S407). If it is determined that the next bit is also 0 bit (step S407; YES), the process returns to the process of step S407, and the above-described process is repeated. On the other hand, when it is determined that the next bit is not 0 bit (step S407; NO), the silence state detection unit 204E cancels the silence state (step S408).

  Then, the 0-bit detection unit 204A initializes the 0-bit counter C1 (step S402), the process returns to the process of step S401, and the above-described process is repeated.

  According to the second embodiment, the noise sound input unit 201 continuously collects noise sounds when the sound correction apparatus 200 is turned on or a sound collection instruction is given by the user via the operation unit 205. While the silent state detecting unit 204E cancels the silent state, the zero data overwriting unit 204F overwrites the encoded sampling data of noise sound sequentially input from the A / D 202 with zero data. When the silent state detecting unit 204E detects the silent state, the zero data overwriting unit 204F stops the process of overwriting the encoded sampling data of the noise sound sequentially input from the A / D 202 with the zero data. By doing so, even if the noise sound is continuously collected by the noise sound input unit 201, the same effect as in the case of the first embodiment can be obtained.

(Embodiment 3)
In the first and second embodiments, a 0-bit detection unit 204A is provided, and the 0-bit detection unit 204A determines whether or not the first bit of the audio signal input from the audio reproduction unit 102 of the audio device 100 is 0 bits in order. When the number of consecutive 0 bits exceeds the 0-bit counter threshold value, it is determined that there is a silent state, and the audio playback unit 102 of the audio device 100 performs volume adjustment or the like based on the noise sound in the silent state. A control signal SG1 for executing the acoustic correction process was generated.

  In this embodiment, the control unit 204 controls the audio playback unit 102 via the control unit 106 of the audio device 100 without providing the 0-bit detection unit 204A, thereby collecting noise sound in a silent state. Realize the sound. For example, when a CD track is switched, the noise sound collection instruction unit 204B outputs a sound collection instruction to the noise sound input unit 201, and as soon as the noise sound collection for a predetermined time is completed, the control unit 204 causes the audio playback unit 102 to start playback of the next track.

  As shown in FIG. 8, the audio system 1 according to the present embodiment has the same basic configuration as that of the first embodiment. However, the control unit 204 is different from that of the first embodiment in that a timer 204G is provided instead of the 0-bit detection unit 204A. Also, the functions performed by the audio playback unit 102, the control unit 106, the control unit 204 of the sound correction device 200, the noise sound collection instruction unit 204B, and the determination unit 204C of the audio device 100 are as in the case of the first embodiment. Is slightly different.

  The audio playback unit 102 does not output the audio signal to the sound correction device 200. Further, the audio playback unit 102 starts playback of media such as a compressed file and a CD, for example, according to the control of the control unit 204 of the sound correction apparatus 200. Also, the audio playback unit 102 sends a playback end signal SG2 indicating the end of playback via a communication unit (not shown) when playback of the compressed file ends or playback of a medium track such as a CD ends. To the acoustic correction apparatus 200.

  The control unit 106 controls the audio playback unit 102 based on the playback start signal SG3 from the control unit 204 of the acoustic correction apparatus 200 to start playback of media such as a compressed file and a CD.

  When the determination unit 204C determines that the timer 204G has timed out, the control unit 204 generates and generates a playback start signal SG3 for causing the audio playback unit 102 to start playback of media such as a compressed file and a CD, for example. The reproduced start signal SG3 is transmitted to the control unit 106 of the audio apparatus 100. In this way, the playback start of media such as compressed files and CDs is controlled via the control unit 106.

  Upon receiving the reproduction end signal SG2 transmitted from the audio reproduction unit 102, the noise sound collection instruction unit 204B outputs a noise sound collection start instruction to the noise sound input unit 201, and also sets a timer 204G. Start it. When the determination unit 204C determines that the timer 204G has timed out, the noise sound collection instruction unit 204B outputs an instruction to end the noise sound collection to the noise sound input unit 201.

  The determination unit 204C determines whether the audio correction unit 200 has received the reproduction end signal SG2 transmitted from the audio reproduction unit 102, so that the audio reproduction unit 102 reproduces a track of a medium such as a compressed file or a CD. It is determined whether or not. Further, the determination unit 204C determines whether or not the timer 204G has timed out.

  The timer 204G is a timer for managing the noise sound collection time by the noise sound input unit 201. The timer 204G is started by the noise sound collection instruction unit 204B and times out when a predetermined time elapses.

  Next, with reference to FIG. 9, the flow of noise sound collection processing in the present embodiment will be described. This noise sound collection processing is started when the reproduction end signal SG2 is transmitted by the audio reproduction unit 102 of the audio apparatus 100 as a trigger.

  The determination unit 204C determines whether or not the reproduction end signal SG2 has been received (step S501). If it is determined that the reproduction end signal SG2 has not been received (step S501; NO), the processing of step S501 is repeated, and the reception of the reproduction end signal SG2 is awaited.

  On the other hand, when it is determined that the reproduction end signal SG2 has been received (step S501; YES), the noise sound collection instruction unit 204B instructs the noise sound input unit 201 to start collecting the noise sound. At the same time, the timer 204G is started (step S502).

  In response to the sound collection start instruction from the noise sound collection instruction unit 204B, the noise sound input unit 201 starts collecting the noise sound (step S503). The noise sound collected by the noise sound input unit 201 is amplified and output to the A / D 202. The A / D 202 converts the noise sound into a digital signal (noise signal) and outputs the noise signal to the control unit 204.

Then, the determination unit 204C determines whether or not the timer 204G has timed out (step S504).
If it is determined that the timer 204G has not yet timed out (step S504; NO), the process repeats the process of step S504 and waits for the consideration 204G to time out. Meanwhile, the noise sound input unit 201 continues to collect the noise sound.

  On the other hand, when it is determined that the timer 204G has timed out (step S504; YES), the noise sound collection instruction unit 204B outputs an instruction to end the noise sound collection to the noise sound input unit 201. (Step S505).

  In response to the sound collection end instruction from the noise sound collection instruction unit 204B, the noise sound input unit 201 ends the collection of the noise sound (step S506). Then, the control unit 204 generates a reproduction start signal SG3 and transmits the generated reproduction start signal SG3 to the audio device 100 (step S507). And a process returns to the process of step S501 and repeats the above-mentioned process.

  According to the third embodiment, the control unit 204 of the sound correction apparatus 200 controls the reproduction of a medium such as a compressed file or a CD, and the noise sound collection instruction unit 204B is a compressed file or a CD or the like by the audio reproduction unit 102. When the reproduction of the media is completed, the noise sound input unit 201 is instructed to start collecting the noise sound. When the noise sound input unit 201 picks up the noise sound for a predetermined time, the noise sound collection instruction unit 204B instructs the noise sound input unit 201 to end the noise sound collection. Then, the control unit 204 instructs the audio reproduction unit 102 to perform reproduction next. In this way, it is possible to pick up a noise sound that is not mixed with an audio reproduction sound after the reproduction of a track of a medium such as a compressed file or a CD ends and the next reproduction starts. In addition, noise is picked up between playbacks, and acoustic correction is performed based on the picked-up noise, so that output volume adjustment processing and noise can be performed according to the changing noise. It is possible to perform acoustic correction such as frequency equalizing the frequency band buried in the.

(Embodiment 4)
In the third embodiment, the start of the generation of a compressed file or a medium such as a CD is controlled, and the noise sound is collected for a predetermined time after the reproduction of each compressed file or each track is completed.

  In the present embodiment, when the audio apparatus 100 outputs music or sound that is demodulated and restored by receiving radio waves such as radio or television broadcasts, the noise sound is reduced while the reception sensitivity of the radio waves deteriorates and the sound is interrupted. Collect sound.

  As shown in FIG. 10, the audio system 1 according to the present embodiment has the same basic configuration as that of the first embodiment. However, the control unit 204 is different in that the 0-bit detection unit 204A is not provided and the acoustic correction apparatus 200 includes a received radio wave intensity measurement unit 206. Further, the functions performed by the noise sound collection instruction unit 204B and the determination unit 204C are slightly different from those of the first embodiment. In addition, the storage unit 203 holds a threshold value in which a reception intensity at which sound is interrupted is set in advance.

  When the determination unit 204C determines that the reception intensity level of the radio wave measured by the reception radio field intensity measurement unit 206 is below the threshold, the noise sound collection instruction unit 204B sends a noise sound input to the noise sound input unit 201. Outputs sound collection start instruction. When it is determined again that the radio wave reception intensity level is equal to or higher than the threshold value, an instruction to end noise noise collection is output to the noise sound input unit 201.

  The determination unit 204C determines whether or not the reception intensity measured by the reception radio wave intensity measurement unit 206 is below a threshold value that is set in advance for reception intensity at which sound is interrupted. That is, the determination unit 204C determines whether or not the sound is interrupted. In addition, the determination unit 204C determines whether or not the reception intensity measured by the reception radio wave intensity measurement unit 206 is equal to or higher than the threshold again. That is, it is determined whether or not the reception intensity has recovered to a level at which sound is not interrupted.

  The reception radio wave intensity measuring unit 206 is constituted by a reception element, an electric field intensity measurement circuit, and the like, and measures the intensity of the radio wave received by the reception element.

  Next, with reference to FIG. 11, the flow of noise sound collection processing in the present embodiment will be described. This noise sound collection processing is started when the sound correction apparatus 200 is turned on or a sound collection instruction is given by the user via the operation unit 205.

  The determination unit 204C determines whether or not the intensity of the received radio wave measured by the received radio wave intensity measuring unit 206 is below a threshold value (step S601). If the received radio wave intensity measured by the received radio wave intensity measuring unit 206 is equal to or higher than the threshold (step S601; NO), the process returns to the process of step S601 and repeats the above-described process.

  On the other hand, when it is determined that the intensity of the received radio wave measured by the received radio wave intensity measuring unit 206 is lower than the threshold value (step S601; YES), the noise sound collection instruction unit 204B sends to the noise sound input unit 201. On the other hand, an instruction to start collecting a noise sound is output (step S602).

  In response to the sound collection start instruction from the noise sound collection instruction unit 204B, the noise sound input unit 201 starts collecting the noise sound (step S603). The noise sound collected by the noise sound input unit 201 is amplified and output to the A / D 202. The A / D 202 converts the noise sound into a digital signal (noise signal) and outputs the noise signal to the control unit 204.

  Then, the determination unit 204C determines whether or not the intensity of the received radio wave measured by the received radio wave intensity measuring unit 206 is equal to or higher than the threshold value again (step S604). If it is determined that the intensity of the received radio wave measured by the received radio wave intensity measuring unit 206 is still below the threshold (step S604; NO), the process repeats the process of step S604. Meanwhile, the noise sound input unit 201 continues to collect the noise sound.

  On the other hand, when it is determined that the intensity of the received radio wave measured by the received radio wave intensity measuring unit 206 is equal to or higher than the threshold again (step S604; YES), the noise sound collection instruction unit 204B An instruction to end the collection of noise sound is output to 201 (step S605).

  In response to the sound collection end instruction from the noise sound collection instruction unit 204B, the noise sound input unit 201 ends the collection of the noise sound (step S606). And a process returns to the process of step S601 and repeats the above-mentioned process.

  According to the fourth embodiment, when the audio device 100 outputs music or sound that is restored by demodulating received radio waves such as radio and television broadcasts, the received radio wave intensity measured by the received radio wave intensity measuring unit 206 is When the value falls below the threshold value, the noise sound collection instruction unit 204B instructs the noise sound input unit 201 to start collecting the noise sound, and again receives the received radio wave intensity measured by the received radio wave intensity measurement unit 206. When the intensity is equal to or higher than the threshold, the noise sound collection instruction unit 204B issues an instruction to end the noise sound collection to the noise sound input unit 201. By doing so, it becomes possible to pick up a noise sound while the reception sensitivity of radio waves deteriorates and the sound is interrupted. While the reception sensitivity of radio waves deteriorates and the sound is interrupted, the noise volume is picked up, and sound correction is performed based on the picked up noise volume. Acoustic correction such as frequency equalizing a frequency band buried in the adjustment process or noise sound becomes possible.

(Modification 1)
In the fourth embodiment, while the received radio wave intensity measured by the received radio wave intensity measuring unit 206 is below the threshold value, the audio device 100 may be controlled not to output the audio reproduction sound.

  FIG. 12 is a flowchart of noise sound collection processing in the present modification. In the processing of step S701, the noise sound collection instruction unit 204B outputs an instruction to start collecting the noise sound to the noise sound input unit 201, and the control unit 204 transmits an audio signal to the audio device 100. An output stop instruction signal SG4 for stopping the output of the reproduction sound is generated, and the generated output stop instruction signal SG4 is transmitted to the audio apparatus 100 via a communication unit (not shown).

  Further, in the process of step S702, the noise sound collection instruction unit 204B outputs an instruction to end the noise sound collection to the noise sound input unit 201, and the control unit 204 provides the audio device 100 with the instruction. Then, an output resumption instruction signal SG5 for resuming output of the audio reproduction sound is generated, and the generated output resumption instruction signal SG5 is transmitted to the audio apparatus 100 via a communication unit (not shown).

  According to the first modification, the audio reproduction sound is controlled not to be output from the audio device 100 while the received radio wave intensity measured by the received radio wave intensity measuring unit 206 is below the threshold value. By doing so, noise sound can be collected in the silent state, so that more effective acoustic correction is possible compared to the case of the fourth embodiment.

  In the above embodiment, the audio correction apparatus 200 of the present invention has been described by taking the audio system 1 as an example. However, the present invention is not limited to this, and the sound correction apparatus 200 of the present invention may be, for example, a mobile phone, PHS ( It can be applied to all audio output devices (systems) that output sounds such as music and voice, such as Personal Handy-phone System), telephones, radios, TVs (Television), radios, and video conferencing systems.

  Moreover, in the said embodiment, although the acoustic correction apparatus 200 was demonstrated as an apparatus which has an independent housing | casing, it is not limited to this, Even if it is integrated in the housing | casing same as the audio | voice output apparatus mentioned above. Good. In this case, for example, a control unit (CPU) may be shared.

  The configuration of the third or fourth embodiment may be applied to the first or second embodiment. In this case, for example, when reproducing a track of a medium such as a compressed file or a CD, the noise sound may be collected by the method described in the third embodiment, or the first or second embodiment. In the above method, it may be configured to select whether to collect a noise sound by the method described above or to collect a noise sound by the method described above in the third embodiment. For example, when receiving radio waves such as radio and television broadcasts and outputting music and audio restored by demodulating the received radio waves, the noise sound is generated by the method described in the fourth embodiment or the first modification. The noise sound may be collected by the method described in the first or second embodiment, or the noise sound may be collected by the method described in the fourth embodiment or the first modification. You may comprise so that it can be selected.

In the above embodiment, the program to be executed is a computer-readable recording medium such as a flexible disk, a CD-ROM (Compact Disc Read-Only Memory), a DVD (Digital Versatile Disc), and an MO (Magneto-Optical Disc). The above-described processing may be executed by storing and distributing the program and installing the program.
Further, it may be stored in a disk device or the like of a predetermined server device on a communication network such as the program Internet, and may be acquired by superimposing it on a carrier wave, for example.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to the specific embodiment which concerns, This invention includes the invention described in the claim, and its equivalent range It is.

DESCRIPTION OF SYMBOLS 1 Audio system 100 Audio apparatus 101 Input part 102 Audio reproduction part 103 D / A
104 AMP
105 Speaker 106 Control Unit 107 Operation Unit 200 Sound Correction Device 201 Noise Sound Input Unit 202 A / D
203 storage unit 204 control unit 204A 0-bit detection unit C1 0-bit counter 204B noise sound pickup instruction unit 204C determination unit 204D processing unit 204E silence state detection unit 204F 0 data overwrite unit 204G timer 205 operation unit 206 received radio wave intensity measurement unit SG1 Control signal SG2 Playback end signal SG3 Playback start signal SG4 Output stop instruction signal SG5 Output restart instruction signal SPi Encoded sampling data

Claims (13)

A noise input unit that picks up the noise that is external environmental sound;
Of the noise sounds collected by the noise sound input unit, the sound output by the sound output device is sounded based on the noise sound collected while the sound output from the sound output device is silent. A processing unit to be corrected;
Comprising
An acoustic correction apparatus characterized by that. A determination unit for determining whether the sound output from the audio output device is a silent state or a non-silent state;
When the sound output from the sound output device is determined to be silent by the determination unit, the noise sound input unit is instructed to start collecting noise sound, and the determination unit When it is determined that the sound output from the sound output device is in a silent state again, a first noise sound collection for instructing the noise sound input unit to end the collection of the noise sound. A sound indicator;
Further comprising
The acoustic correction apparatus according to claim 1. A 0-bit detector that detects whether or not each bit of serial digital data that constitutes an audio signal sequentially input from the audio output device is a 0-bit value;
The determination unit determines that the sound output from the audio output device is silent when the 0-bit detection unit continuously detects 0 bits, and the 0-bit detection unit determines that the sound other than the 0-bit When a bit is detected, it is determined that there is no silence.
The acoustic correction apparatus according to claim 2, wherein When the number of 0 bits continuously detected by the 0-bit detection unit exceeds a preset threshold, the determination unit determines that the sound output from the audio output device is in a silent state. judge,
The acoustic correction apparatus according to claim 3. An analog-digital converter that samples the noise sound collected by the noise sound input unit and converts it into a digital signal by sequentially encoding the sampling data;
A determination unit for determining whether the sound output from the audio output device is a silent state or a non-silent state;
If it is determined by the determination unit that the sound output from the audio output device is in the silent state, it is determined that the sound is in the next silent state after it is determined that the sound is in the silent state. A 0 data overwriting unit that replaces the sampling data encoded by the analog-digital converter with 0 data,
Further comprising
The processing unit acoustically corrects the sound output by the audio output device based on the noise sound of the portion that has not been replaced with 0 data by the 0 data overwrite unit.
The acoustic correction apparatus according to claim 1. The audio output device has a media playback function,
When detecting that the audio output device has finished reproducing the media, the noise sound input unit is instructed to start collecting noise sound, and after a predetermined time has elapsed from the instruction to start collecting noise sound, A second noise sound collection instruction unit that instructs the noise sound input unit to end the collection of the noise sound;
The sound correction device according to claim 1, wherein the sound correction device is a sound correction device. A control unit that controls the audio output device to reproduce the next media after the predetermined time has elapsed from the instruction to start collecting the noise sound by the second noise sound collection instruction unit;
The acoustic correction apparatus according to claim 6. The audio output device has a function of receiving radio waves and outputting sound restored by demodulating the received radio waves,
A received radio wave intensity measuring unit for measuring the received radio wave intensity;
When the reception intensity measured by the received radio field intensity measurement unit falls below a preset threshold, the noise sound input unit is instructed to start collecting a noise sound, and measured by the received radio field intensity measurement unit When the received intensity is again equal to or greater than the threshold, a third noise sound collection instruction unit that instructs the noise sound input unit to end the collection of the noise sound;
Further comprising
The sound correction device according to claim 1, wherein the sound correction device is a sound correction device. When the received intensity measured by the received radio wave intensity measuring unit falls below a preset threshold, the audio output device is controlled to stop outputting sound, and the received intensity measured by the received radio wave intensity measuring unit However, when it becomes equal to or more than the threshold again, the audio output device is further controlled, and a control unit that restarts the sound output is further provided.
The acoustic correction apparatus according to claim 8. A noise input unit that picks up the noise that is external environmental sound;
Among the noise sounds collected by the noise sound input unit, a processing unit that acoustically corrects the output sound based on the noise sound collected while the output sound is silent.
Comprising
An audio output device characterized by that. A noise input unit that picks up the noise that is external environmental sound;
Of the noise sounds collected by the noise sound input unit, the sound output by the sound output device is sounded based on the noise sound collected while the sound output from the sound output device is silent. A processing unit to be corrected;
Comprising
An acoustic correction circuit characterized by that. Picks up noise that is external environmental sound,
Of the collected noise sound, the sound output from the sound output device is acoustically corrected based on the noise sound collected while the sound output from the sound output device is silent.
An acoustic correction method characterized by the above. To a computer having a function of correcting the sound output by the audio output device,
Processing to pick up noise that is external environmental sound,
A process for acoustically correcting the sound output from the sound output device based on the noise sound collected while the sound output from the sound output device is silent during the collected noise sound; ,
To execute,
A program characterized by that.

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