JP2008167319A - Headphone system, headphone drive controlling device, and headphone - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a predetermined sound to be listened in surrounding sounds upon using a headphone, and to improve a determination accuracy of whether or not a sound is a predetermined sound. <P>SOLUTION: A headphone drive controlling device which supplies a sound signal of a left channel to a left side speaker of a headphone and a sound signal of a right channel to a right side speaker has a both-ear signal processor performing both-ear processing to output signals of a first microphone arranged in the vicinity of the left side speaker and a second microphone arranged in a vicinity of the right side speaker, and generating waveform data indicating a sound source waveform to be outputted, a sound recognition processor determining whether or not the waveform indicating the output data of the both-ear signal processor coincides with any of predetermined waveforms, and outputting an external sound detection signal when coincidence is determined, and a mixer mixing the output signal of the first microphone to the sound signal of the left channel to be outputted when the external sound detection signal is received, and mixing the output signal of the second microphone to the sound signal of the right channel to be outputted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a headphone drive control device, and more particularly, to a technology that enables a user who is listening to a musical sound or the like using headphones to listen to surrounding sounds.

In recent years, portable music playback devices such as MP3 players have become widespread. This type of musical sound reproducing device can be used outdoors or in a vehicle such as a train. In order to avoid the influence of ambient noise during the use, a silencer headphone (hereinafter simply referred to as “headphone”) is used. Is generally used.
However, when listening to a musical sound or the like using headphones, there is a problem that a warning sound such as a call or caution from the surroundings or a car horn sound cannot be heard, which may be dangerous. For this reason, various techniques have been proposed that allow the user to listen to specific sounds of the surroundings even when using headphones. For example, in Patent Document 1, a volume having an audio input unit, a volume adjustment unit that adjusts the volume of audio input to the audio input unit, and an audio output unit that outputs audio whose volume is adjusted by the volume adjustment unit In the control device, a microphone, a storage unit that stores a voice pattern, a voice pattern recognition unit that recognizes a voice pattern detected by the microphone, and a voice that the voice pattern recognition unit is detected by the microphone are stored in the storage unit. It has been proposed to provide a volume control unit for instructing the volume adjustment unit to adjust the volume when the voice pattern is confirmed.
JP 2004-13084 A

However, in the technique disclosed in Patent Document 1, it is determined whether an external sound is a sound determined in advance by the user as being necessary to be heard or whether it is a mere noise. Therefore, there is a problem that it is practically difficult to distinguish from noise by pattern recognition.
The present invention has been made in view of the above problems, and enables the user to listen to the sound predetermined by the user when it is necessary to listen even while using the headphones. It is an object of the present invention to provide a technique that makes it possible to accurately determine whether a sound is a predetermined sound.

  In order to solve the above problems, the present invention has a left-ear speaker and a right-ear speaker, and a first microphone is fixed in the vicinity of the left-ear speaker, while the right-hand speaker is used. Headphones with a second microphone fixed in the vicinity of the speaker and the sound signals of the left channel and the right channel are received from the sound source device, and the sound signal of the left channel is supplied to the speaker for the left ear, while the right channel A headphone drive control device that supplies a sound signal to the right-ear speaker, wherein the headphone drive control device uses at least one of a phase difference or a time difference between the output signals of the two microphones to perform noise analysis and noise reduction. A binaural signal processing unit that generates and outputs waveform data indicating a sound source waveform of the sound represented by the output signals, and a waveform data output from the binaural signal processing unit. A speech recognition processing unit that outputs an external sound detection signal when it is determined that the waveform represented by the data matches one of a predetermined waveform or a plurality of predetermined waveforms, and the speech recognition When an external sound detection signal is received from the processing unit, the output signal of the first microphone is mixed with the sound signal of the left channel and supplied to the speaker for the left ear, while the output signal of the second microphone And a mixer that mixes the sound signal with the right channel sound signal and supplies the sound signal to the right-ear speaker.

  In order to solve the above problems, the present invention includes a left-ear speaker and a right-ear speaker, and a first microphone is fixed in the vicinity of the left-ear speaker, while the right microphone A headphone with a second microphone fixed in the vicinity of the ear speaker and a sound signal of the left channel and the right channel from the sound source device and receiving the sound signal of the left channel to the speaker for the left ear, A headphone drive control device that supplies a channel sound signal to the right-ear speaker, wherein the headphone drive control device uses at least one of a phase difference or a time difference between the output signals of the two microphones to perform noise analysis and A binaural signal processing unit that performs noise reduction and generates and outputs waveform data indicating a sound source waveform of a sound represented by the output signals, and is output from the binaural signal processing unit A speech recognition processing unit that determines whether or not a waveform represented by the shape data matches one or more of predetermined waveforms, and outputs an external sound detection signal when it is determined to match, the speech When an external sound detection signal is received from the recognition processing unit, the output signal of the first microphone is supplied to the left ear speaker instead of the left channel sound signal, and the first channel sound signal is replaced with the right channel sound signal. And a selection unit that supplies an output signal of the microphone to the right-ear speaker.

  In order to solve the above problems, the present invention supplies a left channel sound signal received from a sound source device to a speaker for a left ear of a headphone, while a right channel sound signal received from the sound source device is supplied to the headphone. In the headphone drive control apparatus for supplying to the right ear speaker, the output signal of the first microphone arranged in the vicinity of the left ear speaker and the output of the second microphone arranged in the vicinity of the right ear speaker A binaural signal processing unit that performs noise analysis and noise reduction using at least one of a signal phase difference or a time difference and generates and outputs waveform data indicating a sound source waveform of a sound represented by the output signal; and the binaural signal It is determined whether or not the waveform represented by the waveform data output from the processing unit matches one or more of the predetermined waveforms. A speech recognition processing unit that outputs an external sound detection signal in the case where the external microphone detection signal is received, and when the external sound detection signal is received from the speech recognition processing unit, the output signal of the first microphone is mixed with the sound signal of the left channel. And a mixer for mixing the output signal of the second microphone with the sound signal of the right channel and supplying the output signal to the speaker for the right ear. Providing equipment.

  In order to solve the above problems, the present invention supplies a left channel sound signal received from a sound source device to a speaker for a left ear of a headphone, while a right channel sound signal received from the sound source device is supplied to the headphone. In the headphone drive control apparatus for supplying to the right ear speaker, the output signal of the first microphone arranged in the vicinity of the left ear speaker and the output of the second microphone arranged in the vicinity of the right ear speaker A binaural signal processing unit that performs noise analysis and noise reduction using at least one of a signal phase difference or a time difference and generates and outputs waveform data indicating a sound source waveform of a sound represented by the output signal; and the binaural signal It is determined whether or not the waveform represented by the waveform data output from the processing unit matches one or more of the predetermined waveforms. A speech recognition processing unit that outputs an external sound detection signal in the case of receiving the external sound detection signal from the speech recognition processing unit, the output signal of the first microphone instead of the sound signal of the left channel A headphone drive control device comprising: a selection unit that supplies a left-ear speaker to an output signal of the second microphone to the right-ear speaker instead of a right channel sound signal. .

  In order to solve the above problems, the present invention includes a left-ear speaker and a right-ear speaker, and a first microphone is fixed in the vicinity of the left-ear speaker, while the right microphone A headphone is provided in which a second microphone is fixed in the vicinity of the ear speaker.

  According to the present invention, it is possible to make a user listen to a sound predetermined by a user when it is necessary to listen even when the headphones are being used, and whether the sound is a predetermined sound or not. It is possible to perform such determination with high accuracy.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
(A: Configuration)
FIG. 1 is a block diagram illustrating a configuration example of a headphone system 10 according to an embodiment of the present invention. As shown in FIG. 1, the headphone system 10 includes a headphone 100 and a headphone drive control device 200.

The headphone 100 includes a speaker 110L that emits sound toward the user's left ear and a speaker 110R that emits sound toward the user's right ear. The speaker 110L receives the output signal ZL of the left channel from the headphone. The right channel output signal ZR is supplied from the headphone drive control device 200 to the speaker 110R. As shown in FIG. 1, each of the speakers 110L and 110R is built in each of the earpieces 130L and 130R. The ear contacts 130L and 130R in FIG. 1 cover the ears of the user wearing the headphones 100, and mute or silence external sounds so as not to interfere with listening to the sound output from the speakers 110L and 110R. It is. The ear pad 130L is provided with a microphone 120L in the vicinity of the speaker 110L and outward with respect to the speaker 110L (that is, in a direction in which ambient sounds are easily collected). Similarly, the earpiece 130R is provided with a microphone 120R facing the speaker 110R in the vicinity of the speaker 110R. The microphone 120L supplies a sound signal (hereinafter referred to as an external sound signal) YL representing the collected sound (ie, external sound) to the headphone drive control device 200, and the microphone 120R receives an external sound signal YR representing the collected external sound. This is supplied to the headphone drive control device 200.
The sound source device 300 is an MP3 player, for example, and generates sound signals XL and XR of two left and right channels (hereinafter referred to as sound source signals) XL and XR according to the musical sound data stored in the own device, and supplies them to the headphone drive control device 200. .

The headphone drive control device 200 functions as, for example, a remote controller that controls tone reproduction in the sound source device 300, and performs signal processing such as level adjustment on the left-channel sound source signal XL received from the sound source device 300 and outputs the output signal ZL. Is generated and supplied to the speaker 110L, while the sound source signal XR received from the sound source device 300 is subjected to the same signal processing to generate an output signal ZR and supplied to the speaker 110R.
In addition, the headphone drive control device 200 determines whether or not the sounds represented by the external sound signals YL and YR received from the microphones 120L and 120R are predetermined sounds that need to be heard by the user of the headphone system. If the sound is determined to be a predetermined sound, the external sound signal YL and the sound source signal XL are mixed to generate an output signal ZL, and the external sound signal YR and the sound source signal XR are mixed. To generate an output signal ZR. As a result, a user who is listening to the musical sound reproduced by the sound source device 300 using the headphones 100 can be made to listen to an external sound that is predetermined as the user needs to listen.
Hereinafter, the configuration of the headphone drive control device 200 will be mainly described with reference to the drawings.

As shown in FIG. 1, the headphone drive control apparatus 200 includes an operation unit 210, a binaural signal processing unit 220, a speech recognition processing unit 230, a mixer 240, and external sound signal processing units 250L and 250R.
As shown in FIG. 1, the external sound signal YL supplied from the microphone 120L is divided into two in the headphone drive control device 200, one of which is given to the binaural signal processing unit 220 and the other to the external sound signal processing unit 250L. It is done. Similarly, the external sound signal YR supplied from the microphone 120R is also divided into two in the headphone drive control device 200, one being supplied to the binaural signal processing unit 220 and the other being supplied to the external sound signal processing unit 250R. The sound source signals XL and XR supplied from the sound source device 300 are given to the mixer 240.

  The external sound signal processing units 250L and 250R include an amplifier and an equalizer (both are not shown in FIG. 1). The amplifier amplifies the external sound signal received from the microphone 120L or 120R to a level suitable for signal processing by the equalizer and supplies the amplified signal to the equalizer. The equalizer applies a band to the sound signal delivered from the amplifier. Various filter processes such as a pass filter process are performed and output to the mixer 240.

  The binaural signal processing unit 220 is, for example, a DSP (Digital Signal Processor), and uses so-called binaural processing using at least one of the phase difference or the time difference between the external sound signals YL and YR given from the microphones 120L and 120R. The waveform data representing the original waveform of the sound represented by the external sound signal (waveform data representing the waveform of the sound source of the sound) is generated, such as removing noise components, and the waveform data is converted into the voice recognition processing unit 230. To supply. As an example of the binaural process, a process for analyzing a noise component by canceling a time difference and a phase difference between the external sound signals YL and YR and obtaining a correlation between the two sound signals, or a process for estimating a sound source direction Is mentioned.

The voice recognition processing unit 230 is, for example, a nonvolatile memory such as an EEPROM (Electronically Erasable and Programmable Read Only Memory) or a RAM (Random
It includes a volatile memory such as an access memory (CPU) and a central processing unit (CPU) (both not shown).
In the nonvolatile memory, three waveform data of waveform data a, waveform data b, and waveform data c are stored in advance. These three waveform data represent, for example, a waveform of a specific person's voice or a car horn sound. Specifically, the waveform data a is the waveform shown in FIG. 2A, and the waveform data b is The waveform shown in FIG. 2B and the waveform data c represent the waveform shown in FIG. In FIG. 2, for simplicity of explanation, the case where each of the waveform data represents a substantially sinusoidal waveform is illustrated, but the waveform of an actual human voice or horn sound is more complicated. Needless to say.

Now, the user of the headphone system shown in FIG. 1 can select one of the three types of waveform data in advance by appropriately operating an operator provided in the operation unit 210. 210 outputs a signal corresponding to the user's operation content to the speech recognition processing unit 230. Upon receiving this signal, the speech recognition processing unit 230 analyzes the signal to identify which of the three types of waveform data has been selected by the user, and the waveform data selected by the user. (For example, an address indicating the storage location of the waveform data) is stored in a predetermined area in the volatile memory.
The non-volatile memory determines whether or not the waveform data received from the binaural signal processing unit 220 matches the waveform data selected by the user in addition to the three types of waveform data. Accordingly, a control program for causing the CPU to execute a process of outputting a control signal (hereinafter referred to as an external sound detection signal) CS to the mixer 240 is stored in advance. The CPU controls the output of the external sound detection signal CS by executing the control program using the volatile memory as a work area. More specifically, when the CPU operating according to the control program determines that the waveform data received from the binaural signal processing unit 220 matches the waveform data preselected by the user, the external sound detection is performed. The signal CS is output.

As shown in FIG. 1, the mixer 240 includes a gain control unit 241, amplifiers 242L and 242R, adders 243L and 243R, and amplifiers 244L and 244R.
The gain control unit 241 determines the gains of the amplifiers 242L and 242R and the gains of the amplifiers 244L and 244R according to whether or not the external sound detection signal CS is received from the voice recognition processing unit 230, as shown in FIG. Set according to the stored contents of the table. More specifically, the gain control unit 241 includes a non-volatile memory, a volatile memory, and a CPU (all of which are not shown in FIG. 1), similar to the voice recognition processing unit 230. A control program and a gain management table for causing the CPU to execute the amplification factor control process are stored. The CPU of the gain control unit 241 reads the control program from the nonvolatile memory and executes the volatile memory as a work area. As a result, when the external sound detection signal CS is output from the speech recognition processing unit 230, the amplification factors of the amplifiers 242L and 242R are set to “0”, and the amplification factors of the amplifiers 244L and 244R are set to “1”. Set. Conversely, when the external sound detection signal CS is not output from the speech recognition processing unit 230, the amplification factors of the amplifiers 242L and 242R and the amplifiers 244L and 244R are set to “1/2”.
The above is the configuration of the headphone drive control device 200.

(B: Operation)
Next, operations performed by the headphone drive control device 200 will be described with reference to FIG.
4A to 4C, the sound source signal XL and the external sound signal YL that are input to the headphone drive control device 200 during the period from time T0 to time T3, and the headphone drive control device 200 that are output during the same period. It is a figure showing each signal waveform of output signal ZL. In this embodiment, among the left and right channel input / output waveforms, only the left channel input / output waveform is illustrated in FIGS. 4A to 4C. The input / output waveform of the left channel is the same except for the time difference. In the operation example described below, the frequency of the sound source signal XL is f [Hz], and as shown in FIG. 4B, the frequency of the external sound signal YL input during the period from time T0 to T1. f / 2 [Hz], the frequency 2f [Hz] of the external sound signal YL input during the period from time T1 to T2, and the frequency of the external sound signal YL input during the period from time T2 to T3 It is assumed that the frequency is 4 f [Hz]. At the start of this operation, the waveform data a, the waveform data b, and the waveform data c representing the waveforms having the frequencies of f / 2 [Hz], 2f [Hz], and 4f [Hz] are the voice recognition processing unit 230. It is assumed that the waveform data b is previously selected by the user from among these three types of waveform data.

(B-1: Operation in the period from time T0 to T1)
In the period from time T0 to T1, the waveform of the external sound signal YL input from the microphone 120L to the headphone drive control device 200 is a waveform having a frequency of f / 2 [Hz] as shown in FIG. 4B. . Therefore, the binaural signal processing unit 220 performs binaural processing on the external sound signals YL and YR to generate waveform data representing the waveform shown in FIG. 4B, and the waveform data is subjected to voice recognition processing. Delivered to unit 230. Thus, since the noise component is removed by the binaural processing executed by the binaural signal processing unit 220, even if the external sound signals YL and YR contain noise, the signal sources of these external sound signals The signal waveform is restored by the binaural process, and waveform data indicating the waveform is delivered to the speech recognition processing unit 230.

The CPU of the speech recognition processing unit 230 compares the waveform data received from the binaural signal processing unit 220 with the waveform data designated by the user, and outputs an external sound detection signal CS according to the comparison result. As described above, since the waveform data delivered from the binaural signal processing unit 220 to the speech recognition processing unit 230 does not include noise components, it is possible to perform speech recognition in the speech recognition processing unit 230 with high accuracy. Become.
In the present embodiment, the waveform data delivered from the binaural signal processing unit 220 to the speech recognition processing unit 230 during the period from time T0 to T1 represents a waveform having a frequency of f / 2 [Hz], and is selected by the user. Since the waveform data represents a waveform having a frequency of 2 f “Hz”, the CPU of the speech recognition processing unit 230 determines that the two waveforms do not match and does not output the external sound detection signal CS.

Since the gain control unit 241 of the mixer 240 does not receive the external sound detection signal CS during the period from the time T0 to the time T1, the gains of the amplifiers 242L and 242R are set according to the stored contents of the gain management table shown in FIG. “0” is set, and amplification factors of the amplifiers 244L and 244R are set to “1”. As a result, only the sound source signal XL is input to the adder 243L, and the sound source signal XL itself is supplied as an output signal ZL to the speaker 110L. Similarly, the sound source signal XR itself is supplied as the output signal ZR to the speaker 110R. As a result, only the musical sound reproduced by the sound source device 300 is emitted from the speakers 110L and 110R. That is, during the period from time T0 to T1, the user listens only to the musical sound reproduced by the sound source device 300 as shown in FIG.
The above is the operation of the headphone drive control apparatus 200 during the period from time T0 to T1.

(B-2: Operation in the period from time T1 to time T2)
Next, an operation performed by the headphone drive control device 200 in a period from time T1 to T2 will be described.
During the period from time T1 to T2, the waveform of the external sound signal YL input from the microphone 120L to the headphone drive control device 200 is a waveform having a frequency of 2f [Hz] as shown in FIG. Waveform data representing this waveform is delivered from the binaural signal processing unit 220 to the speech recognition processing unit 230. Note that the waveform data delivered from the binaural signal processing unit 220 to the speech recognition processing unit 230 during the period from time T1 to T2 does not include a noise component in the case of the period from time T0 to T1 described above. It is the same.

  The CPU of the speech recognition processing unit 230 compares the waveform data received from the binaural signal processing unit 220 with the waveform data designated by the user, as in the operation during the period from time T0 to T1, and the comparison result In response to this, the output control of the external sound detection signal CS is performed. Since the waveform data delivered from the binaural signal processing unit 220 to the speech recognition processing unit 230 and the waveform data selected by the user in the period from the time T1 to the time T2 both represent a waveform having a frequency of 2f “Hz”. The recognition processing unit 230 determines that the two match, and outputs the external sound detection signal CS to the mixer 240.

In the period from time T1 to T2, the gain control unit 241 of the mixer 240 receives the external sound detection signal CS from the speech recognition processing unit 230, and therefore, according to the stored contents of the gain management table shown in FIG. The amplification factors of 242R and amplifiers 244L and 244R are set to “1/2”. As a result, both the sound source signal XL and the external sound signal YL are input to the adder 243L, and an output signal ZL obtained by mixing both at a ratio of 1: 1 is supplied to the speaker 110L. Similarly, an output signal ZL obtained by mixing the sound source signal XL and the external sound signal YL at a ratio of 1: 1 is supplied to the speaker 110R. For this reason, in the period from time T1 to T2, as shown in FIG. 4C, the user listens to the musical sound and the external sound reproduced by the sound source device 300.
The above is the operation of the headphone drive control device 200 during the period from time T1 to T2. Thereafter, the headphone drive control device 200 performs the same operation as in the period from the time T0 to T1 described above during the period from the time T2 to T3. As a result, the user is reproduced by the sound source device 300 during this period. You will only listen to the musical sounds.

  As described above, in the headphone drive control device 200 according to the present embodiment, the binaural process is performed on the external sound signal collected by the two microphones arranged corresponding to the left and right speakers of the headphone. Since the voice recognition process is performed after the sound source waveform is restored, it is accurately determined whether or not the external sound is a sound designated in advance by the user. For this reason, according to the present embodiment, it is possible to make the user listen to a sound predetermined by the user when it is necessary to listen even when the headphones are being used, and to determine the predetermined sound. It is possible to accurately determine whether or not.

(C: deformation)
Although one embodiment of the present invention has been described above, it goes without saying that modifications described below may be added to such an embodiment.
(1) In the above-described embodiment, after the binaural process is performed on the external sound signal collected by the two microphones arranged corresponding to the left and right speakers of the headphones and the sound source waveform is restored, the waveform is preliminarily stored. A case has been described in which it is determined whether or not it matches a predetermined waveform, and when it is determined to match, the external sound signal and the sound source signal are mixed and supplied to each speaker. However, only the external sound signal is supplied to each speaker during the period when the waveform restored by the binaural processing matches the predetermined waveform, and only the sound source signal is supplied to each speaker during the non-matching period. Of course, it is good. Specifically, the gain management table shown in FIG. 5A may be used instead of the gain management table shown in FIG. 3, and the selection unit 260 shown in FIG. 5B is provided in place of the mixer 240. It may be realized. In the selection unit 260 shown in FIG. 5, when the selectors 261L and 261R receive the external sound output signal CS from the speech recognition processing unit 230, the selectors 261L and 261R receive the sound source signal XL or XR given from the amplifier 242L or the amplifier 242R. When the external sound detection signal CS is not received, the external sound signal YL or YR given from the amplifier 244L or the amplifier 244R is output. In the aspect using the gain management table shown in FIG. 5A or the aspect using the selection unit 260 shown in FIG. 5B instead of the mixer 240, the musical sound corresponding to the period during which the external sound signal is output is displayed. A buffer memory for accumulating and storing sound source signals during the external sound signal output period may be provided in order to miss the sound.

(2) In the above-described embodiment, the case where the three types of waveform data of the waveform data a, the waveform data b, and the waveform data c are stored in advance in the nonvolatile memory of the speech recognition processing unit 230 has been described. The number of waveform data stored in advance in the nonvolatile memory of the processing unit 230 is not limited to 3, and may be 2 or less, or 4 or more. In short, one or a plurality of waveform data may be stored in the nonvolatile memory of the voice recognition processing unit 230. Needless to say, when only one waveform data is stored in the non-volatile memory of the speech recognition processing unit 230, it is not necessary for the user to perform the selection process described above.

(3) In the above-described embodiment, the case where the waveform data is stored in advance in the nonvolatile memory of the speech recognition processing unit 230 has been described. However, additional waveform data is stored in accordance with a user instruction, or from the nonvolatile memory. Of course, erasing may be performed. Specifically, an external output from the microphones 120L and 120R during a period from when an operation for instructing the start of recording to the operation unit 210 is performed until an operation for instructing the end of the operation is performed. What is necessary is just to make the CPU of the speech recognition processing unit 230 execute the process of writing the waveform data obtained by performing binaural processing on the sound signals YL and YR to the nonvolatile memory of the speech recognition processing unit 230. In addition, when the headphone system is being used (that is, in a state where a musical sound reproduced by the sound source device 300 is being listened to), when an operation for lowering the reproduction volume is performed below a predetermined threshold value, the start of recording is instructed. The operation unit 210 determines that the recording operation has been performed, and when the operation for instructing the end of the recording is performed when the operation for raising the playback volume to a value equal to or higher than the threshold is performed. Of course, it is possible to make the determination and notify the CPU of the determination result.

(4) In the embodiment described above, when the external sound collected by the microphones 120L and 120R is a predetermined sound, the external sound signal and the sound source signal are mixed at a ratio of 1: 1. Although the case of outputting to the speakers 110L and 110R has been described, the ratio between the two is not limited to 1: 1, but may be determined as appropriate.
In the above-described embodiment, the case where the user of the headphone system selects in advance one external sound that needs to be heard even when the headphone system is being used has been described. Of course it is good.

It is a block diagram which shows the structural example of the headphone drive control apparatus 200 which concerns on one Embodiment of this invention. It is a figure which shows an example of the waveform which the waveform data pre-stored in the speech recognition process part 230 of the headphone drive control apparatus 200 represent. 4 is a diagram showing an example of a gain management table stored in a gain control unit 241 of the headphone drive control device 200. FIG. 4 is a waveform diagram showing an operation example of the headphone drive control apparatus 200. FIG. It is a figure for demonstrating the headphone drive control apparatus which concerns on a modification (1).

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Headphone system, 100 ... Headphone, 110L, 110R ... Speaker, 120L, 120R ... Microphone, 130L, 130R ... Ear contact, 200 ... Headphone drive control device, 210 ... Operation part, 220 ... Binaural signal processing part, 230 ... Voice recognition processing unit, 240 ... mixer, 241 ... gain control unit, 242L, 242R, 244L, 244R ... amplifier, 243L, 243R ... adder, 250L, 250R ... external sound signal processing unit.

Claims (5)

There is a left ear speaker and a right ear speaker, and a first microphone is fixed in the vicinity of the left ear speaker, while a second microphone is fixed in the vicinity of the right ear speaker. Headphones
A headphone drive control device that receives left channel and right channel sound signals from a sound source device and supplies left channel sound signals to the left ear speaker, while supplying right channel sound signals to the right ear speaker;
With
The headphone drive control device is
A binaural signal processing unit that performs noise analysis and noise reduction using at least one of a phase difference or a time difference between the output signals of both microphones, and generates and outputs waveform data indicating a sound source waveform of a sound represented by the output signals; ,
It is determined whether or not the waveform represented by the waveform data output from the binaural signal processing unit matches any one or a plurality of predetermined waveforms. A voice recognition processing unit to output;
When an external sound detection signal is received from the voice recognition processing unit, the output signal of the first microphone is mixed with the sound signal of the left channel and supplied to the speaker for the left ear, while the second microphone A mixer that mixes the output signal with the right channel sound signal and supplies it to the right-ear speaker;
A headphone system comprising: There is a left ear speaker and a right ear speaker, and a first microphone is fixed in the vicinity of the left ear speaker, while a second microphone is fixed in the vicinity of the right ear speaker. Headphones
A headphone drive control device that receives left channel and right channel sound signals from a sound source device and supplies left channel sound signals to the left ear speaker, while supplying right channel sound signals to the right ear speaker;
With
The headphone drive control device is
A binaural signal processing unit that performs noise analysis and noise reduction using at least one of a phase difference or a time difference between the output signals of both microphones, and generates and outputs waveform data indicating a sound source waveform of a sound represented by the output signals; ,
It is determined whether or not the waveform represented by the waveform data output from the binaural signal processing unit matches any one or a plurality of predetermined waveforms. A voice recognition processing unit to output;
When an external sound detection signal is received from the voice recognition processing unit, the output signal of the first microphone is supplied to the left ear speaker instead of the left channel sound signal, and the right channel sound signal is replaced. A headphone system comprising: a selection unit that supplies an output signal of the second microphone to the right-ear speaker. In the headphone drive control device that supplies the sound signal of the left channel received from the sound source device to the speaker for the left ear of the headphone, while supplying the sound signal of the right channel received from the sound source device to the speaker for the right ear of the headphone,
Noise using at least one of the phase difference or the time difference between the output signal of the first microphone arranged in the vicinity of the left ear speaker and the output signal of the second microphone arranged in the vicinity of the right ear speaker A binaural signal processing unit that performs analysis and noise reduction, and generates and outputs waveform data indicating the sound source waveform of the sound represented by those output signals;
It is determined whether or not the waveform represented by the waveform data output from the binaural signal processing unit matches any one or a plurality of predetermined waveforms. A voice recognition processing unit to output;
When an external sound detection signal is received from the voice recognition processing unit, the output signal of the first microphone is mixed with the sound signal of the left channel and supplied to the speaker for the left ear, while the sound of the right channel is supplied. And a mixer for mixing the output signal of the second microphone with the signal and supplying the mixed signal to the speaker for the right ear. In the headphone drive control device that supplies the sound signal of the left channel received from the sound source device to the speaker for the left ear of the headphone, while supplying the sound signal of the right channel received from the sound source device to the speaker for the right ear of the headphone,
Noise using at least one of the phase difference or the time difference between the output signal of the first microphone arranged in the vicinity of the left ear speaker and the output signal of the second microphone arranged in the vicinity of the right ear speaker A binaural signal processing unit that performs analysis and noise reduction, and generates and outputs waveform data indicating the sound source waveform of the sound represented by those output signals;
It is determined whether or not the waveform represented by the waveform data output from the binaural signal processing unit matches any one or a plurality of predetermined waveforms. A voice recognition processing unit to output;
When an external sound detection signal is received from the voice recognition processing unit, the output signal of the first microphone is supplied to the left ear speaker instead of the left channel sound signal, and the right channel sound signal is replaced. A headphone drive control device comprising: a selection unit that supplies an output signal of the second microphone to the right-ear speaker. There is a left ear speaker and a right ear speaker, and a first microphone is fixed in the vicinity of the left ear speaker, while a second microphone is fixed in the vicinity of the right ear speaker. Headphones characterized by

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