JP2017184085A - Headset device and voice communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a headset device and a voice communication system capable of clearly determining which speaker's voice has been output when the other speaker listens to the voice of a speaker wearing the headset device.SOLUTION: A headset device having a first microphone and a speaker comprises: means for setting a unique code of the headset device; a second microphone different from the first microphone; a noise control filter part for generating a pseudo signal having reverse characteristics to a signal input to the second microphone; and a control part for controlling each part. The control part comprises: voice synthesis means for synthesizing at least the input signal of the first microphone with the pseudo signal; and superposition means for superposing a voice signal output by the voice synthesis means on the unique code, and for outputting them to the outside.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a headset device including a microphone and a speaker, and an audio communication system including the headset device.

As a conventional headset device or headphone device, there is a device including a microphone to which a speaker's voice is input and a speaker that outputs a voice input from the outside. For example, there is a prior art document shown in Patent Document 5.
Here, apart from the voice of the speaker, noise generated around the speaker is also input from a microphone, and there is a device that silences this noise as a noise signal.
For example, there is a headset device provided with a silencer that outputs a pseudo-noise signal of an opposite phase generated from a noise signal as a pseudo-noise and superimposes it on the noise, and this headset device is used by a plurality of speakers. Thus, the voice communication system can be used and can be used for voice conferences and the like. For example, there are prior art documents shown in Patent Documents 1 and 2 as conventional headset devices and voice communication systems.

In addition, using a head-related transfer function (HRTF) as a means for artificially setting the direction of arrival of sound output from a speaker with a speaker attached, for example, Patent Literature There are prior art documents shown in 3 and 4.

JP-A-7-160271 JP 2001-056792 A Japanese Patent Laying-Open No. 2015-165658 JP 2008-113118 A JP 2003-198719 A

  In the headset device and the voice communication system described above, when another speaker listens to the voice of the speaker wearing the headset device, it cannot be clearly determined which speaker's voice is being output. Problems arise.

  The present invention has been made in view of such a conventional situation, and when another speaker listens to the sound of the speaker wearing the headset device, which speaker's sound is output. It is an object of the present invention to provide a headset device and a voice communication system that can be clearly determined.

In order to achieve the above object, a headset device according to the present invention includes:
In a headset device including a first microphone and a speaker,
Means for setting a unique code of the headset device;
A second microphone different from the first microphone;
A noise control filter unit that generates a pseudo signal having a reverse characteristic with respect to a signal input to the second microphone;
A control unit for controlling each unit,
The control unit includes at least speech synthesis means for synthesizing the input signal of the first microphone and the pseudo signal;
A superimposing unit that superimposes the voice signal output by the voice synthesizing unit and the unique code and outputs the same to the outside is provided.

Further, the headset device according to the present invention includes:
The controller is configured to determine a unique code superimposed on an audio signal input from the outside;
Means for setting an arbitrary head-related transfer function for the synthesized voice signal for each determined unique code,
The sound based on the set head-related transfer function is output from the speaker.

Moreover, the voice communication system according to the present invention includes:
In the voice communication system in which a plurality of headset devices are connected for communication, each of the plurality of headset devices is
A means of setting a unique code;
A first microphone for inputting the voice of the speaker;
A second microphone for inputting ambient sounds;
A noise control filter unit that generates a pseudo signal having a reverse characteristic with respect to a signal input to the second microphone;
A speaker that converts an externally input signal into an audio signal and outputs it;
A control unit for controlling each unit,
The control unit includes at least speech synthesis means for synthesizing the input signal of the first microphone and the pseudo signal;
Superimposing means for superimposing the voice signal output by the speech synthesizing means and the unique code and outputting the same to another headset device is provided.

Moreover, the voice communication system according to the present invention includes:
The controller is configured to determine a unique code superimposed on an audio signal input from another headset device;
Means for setting an arbitrary head-related transfer function for the synthesized voice signal for each determined unique code,
The sound based on the set head-related transfer function is output from the speaker.

Moreover, the voice communication system according to the present invention includes:
In a voice communication system in which a plurality of headset devices and a control device are connected in communication, each of the plurality of headset devices is
A means of setting a unique code;
A first microphone for inputting the voice of the speaker;
A second microphone for inputting ambient sounds;
A noise control filter unit that generates a pseudo signal having a reverse characteristic with respect to a signal input to the second microphone;
A speaker that converts an externally input signal into an audio signal and outputs it;
Speech synthesis means for synthesizing the input signal of the first microphone and the pseudo signal;
A superimposing unit that superimposes the voice signal output by the speech synthesizing unit and the unique code and outputs the superimposed code to the control device;
The controller is
Means for converting the superimposed unique code into a predetermined audio signal into the audio signal input from each headset device, and superimposing it on the input audio signal to output to each headset device other than the headset It is provided with.

Moreover, the voice communication system according to the present invention includes:
The control device is configured to determine a unique code superimposed on an audio signal input from each headset device;
Means for setting an arbitrary head-related transfer function for the synthesized voice signal for each determined unique code,
The sound based on the set head-related transfer function is output to each headset device.

The voice communication system according to the present invention is the voice communication system described above,
When an external alarm signal other than each headset device is detected,
Means for converting the detected alarm signal into a predetermined alarm sound;
The converted alarm sound is output to each headset device connected for communication.

  As described above, according to the present invention, a head that can clearly determine which speaker's voice is output when another speaker listens to the voice of the speaker wearing the headset device. A set device and a voice communication system can be provided.

It is a figure which shows the internal structure of the silencer unit which is one Example of this invention. It is a figure which shows the structure of the feedforward type | system | group using the muffler unit which is one Example of this invention. It is a figure which shows the structure of the feedback type | system | group system using the silencing unit which is one Example of this invention. It is a flowchart which shows the process of the silencing method discrimination | determination which is one Example of this invention. It is a flowchart which shows the process of the composite control system which is one Example of this invention. 1 is a hardware block diagram of a headset device according to an embodiment of the present invention (first embodiment). FIG. It is a network diagram of the audio | voice communication system which is one Example of this invention (2nd Example). It is a network diagram of the audio | voice communication system provided with the control apparatus which is one Example of this invention (3rd Example). It is a direction setting table figure by the head related transfer function which is one Example of the present invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 6 is a hardware block diagram of a headset device according to an embodiment of the present invention (first embodiment). The first microphone for inputting the voice of the speaker, the speaker that is arranged near the left and right ears and outputs the voice of the other speaker, and the first microphone for inputting the peripheral voice Another second microphone, a control unit, a noise control filter unit that generates a pseudo signal having a reverse characteristic with respect to a signal input to the second microphone, and a control unit that controls each unit, A unique code indicating a headset device or a speaker who wears the headset device is set. The unique code may be set in advance for each headset, or may be set by the speaker through an input operation such as voice input.
Here, the control unit includes voice synthesis means for synthesizing at least the input signal of the first microphone and the pseudo signal, and superposition means for superposing the voice signal output from the voice synthesis means and the unique code and outputting the same to the outside. It is done.
When a speaker wearing this headset device performs voice communication with another speaker, the noise of the surroundings is reduced, and the speaker's voice together with a unique code unique to the headset device or the speaker. Can be output to other speakers, and who can speak the other speakers (from which headset device) can be determined by a unique code.

FIG. 7 is a network diagram of a voice communication system according to an embodiment of the present invention (second embodiment).
A plurality of the headset devices shown in FIG. 6 described above are connected to a communication network to constitute a voice communication system. In FIG. 7, five headset devices A to E (shown as handsets in the figure) are connected to a communication network, and each headset device reduces the noise of each speaker from the voice input of each speaker. In the above, each unique code is superimposed and output to another headset device, and when another speaker outputs sound other than the speaker from the speaker, which speaker (which headset device) Can be determined and output from the speaker.
In particular, in the present embodiment, each of the headset devices shown in FIG. 6 described above converts the unique code into an audio signal and superimposes it on the audio signal. The unique code and the voice of the speaker are synthesized, and the system configuration is made up of only the headset devices connected to the network.

FIG. 8 is a network diagram of a voice communication system provided with a control apparatus according to an embodiment of the present invention (third embodiment). In FIG. 8, five headset devices A to E (denoted as handsets in the figure) are connected to a communication network, and a plurality of headset devices shown in FIG. An audio communication system is configured in which audio is output to each headset device via a control device that controls the audio of the headset device.
However, in contrast to the voice communication system of FIG. 7 described above, the voice communication system of FIG. 8 temporarily records the input from each headset device in the control device, and sets each headset according to the unique code of each headset device. Audio is output to the device. Therefore, in the headset device of FIG. 6 described above, the voice of the speaker and the unique code can be output as they are without converting the unique code superimposed on the voice input, and each head is controlled by the control device. The unique code is converted into voice by the voice from the set device and synthesized. As a result, the headset device does not need to be provided with a voice conversion means for a unique code, and the headset can be made inexpensive.

Further, in FIG. 8, alarm generation means for transmitting emergency information is connected to the communication network, and emergency information is transmitted in an emergency such as the occurrence of a disaster. When the control device receives the emergency information, the control device detects the emergency information and distributes the emergency information with priority to each headset device connected to the control device separately from the audio signal from each headset device. The emergency information is output from the speaker of each headset device that has received this.
Although the voice communication system having the alarm generation means in FIG. 8 is used as an embodiment, emergency information can be similarly output to each headset device by providing the voice communication system in FIG. 7 with the alarm generation means. .
Further, by providing the control unit in FIG. 6 with means for detecting emergency information, the emergency information can be similarly output from the speaker of the headset device when the headset device is connected to the communication network. .

FIG. 9 is a direction setting table according to the head-related transfer function according to an embodiment of the present invention. This direction setting table includes a column in which a predetermined head-related transfer function is registered, a column indicating a pseudo arrival direction by the head-related transfer function, a column specifying a speaker or a headset device by a unique code, A predetermined head-related transfer function is assigned to a speaker, i.e., a headset device, that is configured and configured to participate in voice communication.
In the headset device of FIG. 6 described above, two speakers are provided for both ears. The audio output from the speaker is a stereo system, and when this audio is output, by setting a predetermined head related transfer function for the audio signal, the arrival direction of the audio signal can be created in a pseudo manner. it can.
Therefore, by setting a predetermined different head-related transfer function for each headset device and adding the head-related transfer function to the audio signal output from the headset device, the arrival of sound based on the head-related transfer function The direction is output from the speaker in a pseudo manner.
As a result, for each audio signal from a plurality of headset devices, an audio signal having a different direction of arrival can be output, and each speaker feels as if other speakers are speaking from different positions. be able to.

When the direction setting table of FIG. 9 is applied to each embodiment, in the headset device of FIG. 6 described above, the control unit determines a unique code superimposed on a sound signal input from the outside, Means for setting an arbitrary head-related transfer function for the synthesized voice signal for each identified unique code, and can output the sound based on the set head-related transfer function from the speaker. The sound from the headset device can be output from a pseudo speaker that speaks from any direction.

In addition, when the direction setting table of FIG. 9 is applied to each embodiment, in the audio communication system of FIG. 7 described above, each control unit of the plurality of headset devices receives audio input from other headset devices. Means for discriminating the unique code superimposed on the signal, and means for setting an arbitrary head-related transfer function for the voice signal synthesized by speech for each of the discriminated unique codes. By outputting the sound by the function from the speaker, it is possible to obtain an output from a pseudo speaker as if each headset device is speaking from a different position.
In the voice communication system of FIG. 8 described above, the control device discriminates the unique code superimposed on the voice signal input from each headset device, and the voice synthesized for each discriminated unique code. Means for setting an arbitrary head-related transfer function with respect to the audio signal, and outputting the sound based on the set head-related transfer function to each headset device, so that each headset device speaks from a different position. The output from the pseudo speaker as shown in FIG.

  Next, specific examples of means for silencing speaker ambient noise used in the headset device and voice communication system used in the present invention will be described. In the muffler system described below, a method such as a Filtered-x method or a Filtered-x LMS method when an FIR filter is used is used as an algorithm.

FIG. 1 is a diagram showing an internal configuration of a silencer unit according to an embodiment of the present invention.
In FIG. 1, reference numeral 1 denotes a mute unit, which is operated by connecting a reference microphone, a speaker, an error microphone, and the like, which will be described later. The silencer unit 1 includes a reference microphone contact 1-1 for connecting a reference microphone, a switch 1-2 for switching a reference signal that is an output of the reference microphone and a reproduced noise signal that is an output of the combining unit 1-8, and an error microphone from the speaker 3. In order to compensate for changes in the transfer characteristics of the secondary path up to 4, the secondary path model 1-3 that generates the learning signal, and the filter coefficient of the noise control filter 1-5 are updated so that the error signal is minimized. Coefficient updating unit 1-4 that performs noise control filter 1-5 that generates a pseudo noise signal, speaker contact 1-6 that connects a speaker, error microphone contact 1-7 that connects an error microphone, and an error that is an error microphone output A synthesis unit 1 that outputs a reproduced noise signal obtained by synthesizing the signal and the pseudo noise signal filtered by the secondary path model 1-9. -8. In order to re-synthesize a noise signal from an error signal, it is constituted by a secondary path model 1-9 that filters and outputs a pseudo noise signal, and each part is controlled by a control unit (not shown). Here, in the secondary path model, the transfer function of the secondary path is modeled by a discrete time system or the like.

  The silencer unit 1 determines whether or not the reference microphone 2 is connected to the reference microphone contact 1-1. When the reference microphone 2 is connected, the switch 1-2 is switched to the error microphone output side (upper side) to start feedforward control. When the reference microphone 2 is not connected, the switch 1-2 is started. Is switched to the reproduction noise signal output side (lower side) to start feedback control.

The feedforward control when it is determined that the reference microphone is connected will be described with reference to FIG. Here, the feed-forward control generates a pseudo noise signal based on the noise collected by the reference microphone, and generates sound waves at a point (for example, an error microphone installation position) at the rear stage with respect to the noise collected by the front stage reference microphone. This is a method of muting by outputting pseudo noise so that the two overlap.
FIG. 2 is a diagram showing a configuration of a feedforward type system using a silencer unit according to an embodiment of the present invention. 2, reference microphone 2 that inputs noise as a reference signal, speaker 3 that outputs pseudo noise signal as pseudo noise, and error microphone 4 that inputs sound in which noise and pseudo noise overlap are input as error signals. The description of the same component as 1 is omitted. Note that noise is transmitted from the left to the right in the figure as indicated by arrows, and the path of noise is referred to as the primary path, and the path of pseudo noise from the speaker to the error microphone is referred to as the secondary path.

  Noise is collected by the reference microphone 2 connected to the reference microphone contact 1-1 and input as a reference signal. The reference signal is input to the secondary path model 1-3 and the noise control filter 1-5 via the switch 1-2. In the secondary path model 1-3, the reference signal is filtered so as to compensate for the change in the transfer characteristic of the secondary path, and a learning signal is generated and output to the coefficient updating unit 1-4. In the coefficient updating unit 1-4, a coefficient used in the noise control filter 1-5 is calculated from the learning signal and the error signal so that the error signal becomes the smallest, a coefficient update signal is generated, and the noise control filter 1 Output to -5. In the noise control filter 1-5, the reference signal is filtered using the coefficient updated by the coefficient update signal, a pseudo noise signal is generated, and is output to the speaker 3 connected to the speaker contact 1-6. In the speaker 3, the input pseudo noise signal is output as pseudo noise so as to have an opposite phase at the position of the error microphone 4.

  The error microphone 4 connected to the error microphone contact 1-7 collects a sound in which the noise and the pseudo noise are overlapped and is canceled and is input as an error signal. The error signal is input to the coefficient updating unit 1-4. The coefficient updating unit 1-4 calculates a coefficient that minimizes the error signal from the learning signal and the error signal, generates a coefficient update signal, and outputs the coefficient update signal to the noise control filter 1-5. In the noise control filter 1-5, the reference signal is filtered using the coefficient updated by the coefficient update signal, a pseudo noise signal is generated, and is output to the speaker 3 connected to the speaker contact 1-6. In the speaker 3, the input pseudo noise signal is output as pseudo noise so as to have an opposite phase at the position of the error microphone 4. By repeating this, the optimum pseudo noise is generated and the noise is dynamically canceled.

  As the algorithm, a well-known Filtered-x method, Filtered-x LMS method, or the like is used.

Next, feedback control when it is determined that the reference microphone is not connected will be described with reference to FIG. Here, feedback control generates a pseudo noise signal based on the noise collected by the error microphone, and the pseudo noise is generated so that the sound wave overlaps at a certain point (for example, the error microphone installation position) against newly coming noise. It is a method to mute by outputting.
FIG. 2 is a diagram showing a configuration of a feedforward type system using a silencer unit according to an embodiment of the present invention. In FIG. 3, since all the components have already been described, individual descriptions are omitted.

  The feedback control differs from the feedforward control in that the reference microphone is not connected or is not detected due to a failure (including a case where a failure is detected).

  Noise is collected and input as an error signal by the error microphone 4 connected to the error microphone contact 1-7. The error signal is input to the coefficient updating unit 1-4 and the adder 1-8. In the adder 1-8, the error signal is added to the filtered pseudo noise signal output from the secondary path model 1-9, and the secondary path model 1 is passed through the switch 1-2 as a reproduced noise signal. -3 and the noise control filter 1-5. In the secondary path model 1-3, the reproduced noise signal is filtered so as to compensate for the change in the transfer characteristic of the secondary path, and a learning signal is generated and output to the coefficient updating unit 1-4. In the coefficient updating unit 1-4, a coefficient used in the noise control filter 1-5 is calculated from the learning signal and the error signal so that the error signal becomes the smallest, a coefficient update signal is generated, and the noise control filter 1 Output to -5. In the noise control filter 1-5, the error signal is filtered using the coefficient updated by the coefficient update signal to generate a pseudo noise signal, which is connected to the secondary path model 1-9 and the speaker contact 1-6. Is output to the speaker 3. In the speaker 3, the input pseudo noise signal is output as pseudo noise so as to have an opposite phase at the position of the error microphone 4. In the secondary path model 1-9, the pseudo noise signal is filtered to re-synthesize the noise signal from the error signal, and is output to the adder 1-8 as a filtered pseudo noise signal.

  The error microphone 4 connected to the error microphone contact 1-7 collects a sound in which the noise and the pseudo noise are overlapped and is canceled and is input as an error signal. The error signal is input to the coefficient updating unit 1-4 and the adder 1-8. In the adder 1-8, the error signal is added to the filtered pseudo noise signal and input as a reproduced noise signal to the secondary path model 1-3 and the noise control filter 1-5 via the switch 1-2. The In the secondary path model 1-3, the reproduced noise signal is filtered so as to compensate for the change in the transfer characteristic of the secondary path, and a learning signal is generated and output to the coefficient updating unit 1-4. In the coefficient updating unit 1-4, a coefficient used in the noise control filter 1-5 is calculated from the learning signal and the reproduced noise signal so that the error signal is minimized, and a coefficient update signal is generated, and the noise control filter 1-5. In the noise control filter 1-5, the reproduced noise signal is filtered using the coefficient updated by the coefficient update signal to generate a pseudo noise signal, which is connected to the secondary path model 1-9 and the speaker contact 1-6. Is output to the selected speaker 3. In the speaker 3, the input pseudo noise signal is output as pseudo noise so as to have an opposite phase at the position of the error microphone 4. By repeating this, the optimum pseudo noise is generated and the noise is dynamically canceled.

  As the algorithm, a well-known Filtered-x method, Filtered-x LMS method, or the like is used.

  The selection or switching between feedforward control and feedback control will be described with reference to FIG. FIG. 4 is a flowchart showing a mute method discrimination process according to an embodiment of the present invention.

  When each device is installed and activated at the site, the muffling unit 1 determines whether a reference microphone is connected to the reference microphone contact 1-1 (S1) (S2). If it is determined in S2 that the reference microphone is connected (Yes), it sets itself to operate in feedforward control (S3), and starts feedforward control (S4). On the other hand, if it is determined in S2 that the reference microphone is not connected (No), it sets itself so as to operate in feedback control (S5) and starts feedback control (S6). During the feedforward control, the reference microphone is connected again. When the reference microphone is removed or the reference microphone fails, the control is switched to feedback control (S1). Further, during feedback control, the connection of the reference microphone is determined again (S1), and the feedforward control is switched when the reference microphone is attached or when the reference microphone returns from a failure. At this time, even if a reference microphone is newly connected, it may be set not to switch to feedforward control.

  As described above, one unit can cope with the feedforward control and the feedback control, and can reduce the man-hours and costs related to the design and construction of the silencing system. Furthermore, it is possible to contribute to the reduction of the customer's system construction freedom and the introduction cost of the customer by reducing the product price.

  Moreover, even if the reference microphone breaks down, the feedforward control can be automatically switched to the feedback control, and the operation of the silencing system can be maintained.

  In the above system, whether or not the reference microphone is connected is automatically determined to select or switch between feedforward control and feedback control. However, a method in which the user manually selects feedforward control and feedback control is also conceivable. .

  In the case of manual selection by the user, two patterns can be considered, one is a method in which a switch is provided in a housing and is physically selected, and the other is a method in which a silencer is accessed from a computer or the like and electrically selected. is there.

  In the physical selection method, when the user switches a switch provided on the housing to a desired mode, the control unit in the silencer unit is set to operate in the selected feedforward control mode or feedback control mode. Control.

  In the method of electrical selection, a computer is connected to the silencer unit 1 directly or via a network, and when the user switches to a desired mode by a GUI operation on the computer, a mode selection signal is transmitted from the computer to the silencer unit 1. The control unit in the silencer unit is controlled so as to operate in the selected feedforward control mode or feedback control mode.

  In these cases, the mode can be physically or electrically switched during the feedforward control or the feedback control, and basically the mode is not automatically switched. However, for example, when the mute state is monitored remotely via a network, the presence / absence of a reference microphone may be detected and a display for prompting mode switching may be displayed. Alternatively, mode switching may be prohibited during operation.

  As described above, when the user manually selects or switches the mode, the degree of freedom of operation of the silencing system can be improved according to the user's request.

  Further, the user may be able to select an automatic switching mode for switching between feedforward control and feedback control by determining the presence or absence of a reference microphone, and a manual selection mode for switching between feedforward control and feedback control by user selection. . In this case, switching can be performed by a physical method or an electrical method as in the case of the manual selection described above. Thereby, the freedom degree of operation of a silencing system can be raised further according to a user's demand.

  With reference to FIG. 5, a description will be given of switching of control methods (combined control) according to noise characteristics, which is another embodiment of the present invention. FIG. 5 is a flowchart showing the process of the decoding control method according to an embodiment of the present invention.

  In order to further enhance the silencing effect, in another embodiment of the present invention, composite control is performed in which feedforward control and feedback control are adaptively switched in accordance with noise characteristics. For example, in the case of the present embodiment, the characteristics of the noise are determined, and when the periodic sound having a constant regularity continues periodically, the control is switched to the feedback control, and when the periodic sound does not continue, the feedforward control is performed. Switch to. At this time, the noise characteristics are determined by a control unit (not shown).

  Here, the noise having periodic regularity is, for example, the sound of an engine of an airplane or a car, the sound of a fan such as an electronic device, a radiator or a compressor, and the noise having no periodic regularity. For example, sound of construction site, musical instrument playing sound, human talking voice, animal crying, sudden sound such as car horn and door opening / closing sound can be considered, but not limited thereto.

  When each device is installed and activated at the site, the muffling unit 1 determines whether a reference microphone is connected to the reference microphone contact 1-1 (S1) (S2). If it is determined in S2 that the reference microphone is connected (Yes), it sets itself to operate in feedforward control (S3), and starts feedforward control (S4). On the other hand, if it is determined in S2 that the reference microphone is not connected (No), it sets itself to operate in feedback control (S5) and starts feedback control (S6).

During feed-forward control or during feedback control with a reference microphone connected, the silencer unit 1 determines whether the noise signal has periodic regularity (S7) (S8).
If it is determined in S2 that there is periodic regularity (Yes), it sets itself to operate in feedback control (S9) and starts feedback control (S10). On the other hand, when it is determined that the noise has no periodic regularity (No), its own setting is maintained so as to operate in feedforward control (S11), and feedforward control is continued (S12). During feedback control at S10 or feedforward control at S12, the connection of the reference microphone is determined again (S1), and when the reference microphone is attached or when the reference microphone returns from a failure, the feedforward control is switched. I am doing so. Alternatively, the noise regularity may be determined again during feedback control at S10 or feedforward control at S12 (S7), and the control method switching loop corresponding to the noise characteristics may be repeated.

  As described above, by adaptively switching to control suitable for the noise characteristics, it is possible to obtain a high silencing effect more suited to the situation.

  Further, even when the noise characteristics change, by switching the silencing method in response to the change, it is possible to bring a higher silencing effect to a site where the noise characteristics change.

  Although the embodiments of the present invention have been described above, the configuration of the system and apparatus according to the present invention is not necessarily limited to the above-described configuration, and various configurations may be used. The present invention can also be provided as, for example, a method or method for executing the processing according to the present invention, a program for realizing such a method or method, or a recording medium for recording the program. It is also possible to provide various systems and devices. The application field of the present invention is not necessarily limited to the above-described fields, and the present invention can be applied to various fields.

  For example, data relating to noise, such as engine speed data in the case of an automobile engine sound, and fan speed data in the case of a fan sound of an electronic device is acquired to update the coefficient in the silencer unit 1. It may be input to the unit 1-4 and used for calculation of the filter coefficient.

  In that case, external input contacts such as the number of revolutions of the car engine and the number of revolutions of the PC fan are provided, and the feed-forward control method, the feedback control method, or the waveform synchronization method naturalization is selected depending on the presence or absence of the external input. In this case, the user may make a physical or electrical selection.

  Note that the configuration in the above-described silencer unit is a configuration corresponding to the Filtered-x algorithm or the Filtered-x LMS algorithm, and therefore, when other algorithms are used, the internal configuration may be increased or decreased or changed. In this case, it goes without saying that the present invention can be applied.

In the headset device or the voice communication system according to the embodiment described above, a microphone (first microphone) for inputting a speaker's voice and a microphone (second microphone) for inputting ambient noise are input to the headset device. A headset device that reduces noise compared to a speaker's voice signal due to the reverse characteristics of the voice signal input to the microphone that inputs ambient noise, the voice signal input to the microphone for voice input being A headset device that amplifies and superimposes a microphone input identification signal on the audio signal.
The headset device according to the embodiment described above is a headset including a microphone unit and a speaker unit, and the headset includes a silencer, and the silencer is reverse to the noise signal input to the microphone unit. A noise control filter unit that generates a pseudo noise signal having a characteristic; a coefficient update unit that updates a filter coefficient of the noise control filter; and a control unit that controls each unit, and another head that is communicatively connected to the headset Voice communication can be performed with the set.

In addition, the audio communication system according to the above-described embodiment is an audio communication system in which a plurality of headsets each having a microphone unit and a speaker unit are connected for communication. The headset includes a silencer, and the silencer includes the microphone. A noise control filter unit that generates a pseudo noise signal having a reverse characteristic to the noise signal input to the unit, a coefficient update unit that updates a filter coefficient of the noise control filter, and a control unit that controls each unit, Voice communication can be performed with another headset connected to the headset.
Further, in the headset device or the voice communication system according to the above-described embodiment, the direction of the speaker wearing the headset can be set in a pseudo manner based on the transfer function of the head.
In the headset device or the voice communication system according to the above-described embodiment, an emergency signal such as an emergency alarm can be transmitted to the headset device with the highest priority.

It is possible to hold a conference in a remote place using the headset device or the voice communication system according to the above-described embodiment, and the voice input to each microphone of the conference participant indicates the microphone input (digital) The data is superimposed, and the superimposed data can be superimposed on the audio data output from another speaker, converted into audio data indicating the microphone input, and output as superimposed audio data .
Further, the voice input of the conference participant can be stored in the memory table as data indicating the voice input of the participant based on the superimposed data.
Furthermore, when outputting the data stored in the memory table, it is possible to create a minutes by recording the conference of each participant that was input by voice and output from the speaker in time series, making it possible to create the minutes by voice. be able to.
Furthermore, based on the data stored in the memory table, the stored speech can be converted into a character string and stored as text data, thereby making the minutes of the character data.
According to the headset device or the voice communication system according to the above-described embodiments, it is possible to have a conversation with another headset device only by connecting the headset device to the communication network, and it is unnecessary even under the noise around the speaker. Can reduce the noise and convey only the necessary sound. Further, the direction of the speaker can be set in a pseudo manner using the head-related transfer function, and the voice arrival direction of each speaker can be recognized differently.

In addition, since the power source of the headset device is supplied from a battery or a cable connected to a communication network, it is not necessary to gather all the speakers together as a conference or conversation using the headset device. The headset device is easy to carry because it is small and lightweight. In addition, an IP conference can be established by using an Internet communication network as a communication network, and a headset device can be connected to the conference call.

INDUSTRIAL APPLICABILITY The present invention is useful for a system that a conference participant wears and participates in a conference. In addition, even in locations where the conference participant is away from each other, the surrounding state (air duct, electronic device, automobile, heavy equipment, airplane) It can be applied to and is effective for noise generating devices such as home appliances, factories and construction sites.
In addition, the present invention can be effectively applied to a confined space vehicle such as a passenger car, a construction vehicle, a racing car, a helicopter, an airplane, or a cruiser.

1: mute unit, 2: reference microphone, 3: speaker, 4: error microphone,
1-1: Reference microphone contact, 1-2: switch, 1-3: secondary path model, 1-4: coefficient update unit, 1-5: noise control filter, 1-6: speaker contact, 1-7: Error microphone contact, 1-8: adder, 1-9: secondary path model.

Claims (7)

In a headset device including a first microphone and a speaker,
Means for setting a unique code of the headset device;
A second microphone different from the first microphone;
A noise control filter unit that generates a pseudo signal having a reverse characteristic with respect to a signal input to the second microphone;
A control unit for controlling each unit,
The control unit includes at least speech synthesis means for synthesizing the input signal of the first microphone and the pseudo signal;
A headset apparatus comprising: a superimposing unit that superimposes the voice signal output from the voice synthesizing unit and the unique code and outputs the same to the outside. The controller is configured to determine a unique code superimposed on an audio signal input from the outside;
Means for setting an arbitrary head-related transfer function for the synthesized voice signal for each determined unique code,
The headset device according to claim 1, wherein a sound based on the set head-related transfer function is output from the speaker. In the voice communication system in which a plurality of headset devices are connected for communication, each of the plurality of headset devices is
A means of setting a unique code;
A first microphone for inputting the voice of the speaker;
A second microphone for inputting ambient sounds;
A noise control filter unit that generates a pseudo signal having a reverse characteristic with respect to a signal input to the second microphone;
A speaker that converts an externally input signal into an audio signal and outputs it;
A control unit for controlling each unit,
The control unit includes at least speech synthesis means for synthesizing the input signal of the first microphone and the pseudo signal;
A speech communication system comprising: a superimposing unit that superimposes the voice signal output by the speech synthesizing unit and the unique code and outputs the superimposed signal to another headset device. The controller is configured to determine a unique code superimposed on an audio signal input from another headset device;
Means for setting an arbitrary head-related transfer function for the synthesized voice signal for each determined unique code,
The voice communication system according to claim 3, wherein a voice based on the set head-related transfer function is output from the speaker. In a voice communication system in which a plurality of headset devices and a control device are connected in communication, each of the plurality of headset devices is
A means of setting a unique code;
A first microphone for inputting the voice of the speaker;
A second microphone for inputting ambient sounds;
A noise control filter unit that generates a pseudo signal having a reverse characteristic with respect to a signal input to the second microphone;
A speaker that converts an externally input signal into an audio signal and outputs it;
Speech synthesis means for synthesizing the input signal of the first microphone and the pseudo signal;
A superimposing unit that superimposes the voice signal output by the speech synthesizing unit and the unique code and outputs the superimposed code to the control device;
The controller is
Means for converting the superimposed unique code into a predetermined audio signal into the audio signal input from each headset device, and superimposing it on the input audio signal to output to each headset device other than the headset A voice communication system comprising: The control device is configured to determine a unique code superimposed on an audio signal input from each headset device;
Means for setting an arbitrary head-related transfer function for the synthesized voice signal for each determined unique code,
6. The voice communication system according to claim 5, wherein a voice based on the set head-related transfer function is output to each headset device. The voice communication system according to any one of claims 3 to 6,
When an external alarm signal other than each headset device is detected,
Means for converting the detected alarm signal into a predetermined alarm sound;
7. The voice communication system according to claim 3, wherein the converted alarm voice is output to each headset device connected for communication.

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