JP2018148404A - Radio communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication device capable of appropriately determining a state in which a user of the radio communication device intends to transmit audio and switching the radio communication device to the transmission state.SOLUTION: When a distance determination signal from a distance determination unit 12 indicates a first distance or less, a transmission control unit 13 causes a transmission audio processing unit 14 to start operation of generating a transmission audio signal. When the distance determination signal indicates a second distance or less, which is shorter than the first distance, the transmission control unit 13 causes a recording unit 16 to start operation of update recording and reading of the audio signal. When the distance determination signal indicates a third distance or less, which is shorter than the second distance, the transmission control unit 13 causes an audio pressure determination unit 11 to start processing of determining audio pressure of the audio signal. When an audio pressure determination signal indicates audio pressure equal to or more than a certain threshold value, the transmission control unit 13 supplies a transmission control signal to a transmission circuit 15 so as to transmit the transmission audio signal as a radio wave.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wireless communication device.

  Patent Document 1 describes a wireless communication device configured to detect the presence of a user of a wireless communication device in the vicinity of the wireless communication device using a human sensor and switch the wireless communication device to a transmission state. Yes. The human sensor detects the presence of the user by sensing heat generated from the human body.

JP 2010-226274 A

  In the wireless communication device described in Patent Literature 1, the wireless communication device is switched to a transmission state only by detecting that a user of the wireless communication device is present in the vicinity of the wireless communication device by the human sensor. It may happen that the user of the wireless communication device is switched to the transmission state even though the user is not trying to transmit the voice.

  An object of the present invention is to provide a wireless communication device capable of appropriately determining a state in which a user of a wireless communication device intends to transmit voice and switching the wireless communication device to a transmission state.

  The present invention relates to a sound pressure determination unit that determines a sound pressure of a sound signal from a microphone and generates a sound pressure determination signal, and a distance from a wireless communication device generated by a distance sensor to a user of the wireless communication device. A distance determination unit that determines a distance from the wireless communication device to the user based on a detection value, generates a distance determination signal, a recording unit that updates and records an audio signal from the microphone, and A transmission audio processing unit that generates a transmission audio signal by performing audio processing on the audio signal from the microphone following the audio signal read from the recording unit, a transmission circuit that transmits the transmission audio signal as a radio wave, and the sound A transmission control unit that monitors the pressure determination signal and the distance determination signal, and the transmission control unit performs the operation of the transmission voice processing unit when the distance determination signal indicates that the distance is equal to or less than a first distance. Open When the distance determination signal indicates that the distance is equal to or less than a second distance shorter than the first distance, the recording unit starts an update recording and reading operation of the audio signal, and the distance determination signal is The sound pressure determination unit starts an operation for determining the sound pressure of the sound signal from the microphone, and the sound pressure determination signal is a predetermined threshold value. When indicating that the sound pressure is the above, the transmission audio signal generated by the transmission audio processing unit, including the audio signal read from the recording unit and the audio signal from the microphone, is transmitted as a radio wave. Provided is a wireless communication device characterized in that a transmission control signal is supplied to a transmission circuit.

  According to the wireless communication device of the present invention, it is possible to appropriately determine the state in which the user of the wireless communication device is to transmit voice and switch the wireless communication device to the transmission state.

It is a block diagram which shows the radio | wireless communication apparatus of one Embodiment. It is a figure which shows the state in which the user tried to use a speaker microphone and the speaker microphone was brought close to himself. It is a figure which shows the state in which the user brought the speaker microphone closer to himself / herself than FIG. 2A. It is a figure which shows the state which brought the speaker microphone closer to itself more than FIG. 2B in order for a user to utter an audio | voice. It is a whole state transition diagram showing operation of a radio communication machine of one embodiment. It is a partial state transition diagram which shows operation | movement of the radio | wireless communication apparatus of one Embodiment. FIG. 4 is a partial state transition diagram subsequent to FIG. 3B illustrating the operation of the wireless communication device of the embodiment. FIG. 3D is a partial state transition diagram subsequent to FIG. 3C illustrating the operation of the wireless communication device of one embodiment. It is a conceptual diagram which shows logically the conditions by which a transmission control part operates a transmission circuit.

  Hereinafter, a wireless communication device according to an embodiment will be described with reference to the accompanying drawings. In FIG. 1, a wireless communication device according to an embodiment includes a main body unit 10 and a speaker microphone 20 connected to the main body unit 10. The function of the speaker microphone 20 may be built in the main body unit 10. The wireless communication device transmits or receives audio data by a half-duplex communication method.

  As shown in FIG. 2A, the user 30 of the wireless communication apparatus wears the main body 10 at any position on the body, and grips the speaker microphone 20 with his / her hand when attempting to transmit audio data. When the function of the speaker microphone 20 is built in the main body unit 10, the user 30 holds the main body unit 10 by hand.

  In FIG. 1, the speaker microphone 20 includes a PTT (Push To Talk) switch 21, a microphone 22, and a distance sensor 23. The speaker microphone 20 includes a speaker (not shown) that generates sound based on the audio data received by the main unit 10. The main body unit 10 includes a sound pressure determination unit 11, a distance determination unit 12, a transmission control unit 13, a transmission voice processing unit 14, a transmission circuit 15, and a recording unit 16. Although the main body unit 10 includes a receiving circuit (not shown), only transmission is shown in FIG.

  When the user 30 depresses the PTT switch 21 to transmit audio data, the PTT switch 21 supplies a PTT signal for operating the transmission circuit 15 to the transmission control unit 13. When the user 30 utters voice, the microphone 22 picks up the voice and supplies an analog voice signal to the sound pressure determination unit 11, the transmission voice processing unit 14, and the recording unit 16.

  For example, the distance sensor 23 emits a transmission wave composed of infrared rays to a predetermined object, and supplies the detection value generated based on the phase difference between the transmission wave and the reflected wave reflected by the object to the distance determination unit 12. To do. The detection value of the distance sensor 23 is a value corresponding to the distance from the distance sensor 23 to the object. Here, the object is the user 30.

  The sound pressure determination unit 11 is provided to realize a so-called VOX (Voice-operated Transmit) function that switches the wireless communication device to a transmission state when the microphone 22 picks up sound. A wireless communication device having a VOX function can perform a hands-free call. The sound pressure determination unit 11 determines the sound pressure of the input analog audio signal and generates a sound pressure determination signal.

  The sound pressure determination unit 11 generates a signal indicating “sound” if the sound pressure is equal to or higher than a predetermined threshold, and generates a sound pressure determination signal indicating “silence” if the sound pressure is lower than the predetermined threshold. . Further, since the voice during conversation is not a continuous sound, if the sound pressure reaches a predetermined threshold or more and then the sound pressure becomes less than the predetermined threshold, the sound pressure determination unit 11 has a predetermined time. A sound pressure determination signal indicating sound is maintained. The sound pressure determination unit 11 supplies a sound pressure determination signal to the transmission control unit 13.

  The distance determination unit 12 determines the distance to the user 30 based on the input detection value, and generates a distance determination signal. The distance determination unit 12 supplies a distance determination signal to the transmission control unit 13. Based on the input distance determination signal, the transmission control unit 13 determines whether the distance D from the distance sensor 23 (speaker microphone 20) to the user 30 is equal to or less than the distance D1 shown in FIG. 2A or the distance D2 shown in FIG. 2B. It can be determined whether it is less than or less than the distance D3 shown in FIG. 2C.

  A distance D1 illustrated in FIG. 2A is a distance when the user 30 tries to use the speaker microphone 20 and brings the speaker microphone 20 close to himself / herself. A distance D2 illustrated in FIG. 2B is a distance in a state where the speaker microphone 20 is closer to itself than in FIG. 2A. A distance D3 shown in FIG. 2C is a distance in a state where the speaker microphone 20 is closer to itself than in FIG. 2B in order to emit sound.

  The recording unit 16 includes an A / D converter and a memory such as a RAM. The recording unit 16 records a digital audio signal obtained by A / D converting the input analog audio signal for a predetermined time. The recording unit 16 overwrites and updates the digital audio signal recorded by FIFO (First-In First-Out). The recording unit 16 only needs to be able to record a digital audio signal for about 1 second.

  As will be described later, the sound pressure determination unit 11 and the recording unit 16 do not always operate, but are configured to operate when conditions described later are satisfied.

  The transmission control unit 13 controls the sound pressure determination unit 11, the transmission voice processing unit 14, the transmission circuit 15, and the recording unit 16. The transmission control unit 13 can be configured by a central processing unit (CPU) of a microcomputer. The transmission control unit 13 and the transmission audio processing unit 14 may be configured by a microcomputer or a DSP (Digital Signal Processor).

  The transmission control unit 13 supplies the sound pressure determination unit 11 with a sound pressure determination control signal for switching between operation and non-operation of the sound pressure determination unit 11. The transmission control unit 13 supplies the recording unit 16 with a recording control signal for switching between operation and non-operation of the recording unit 16.

  An analog audio signal from the microphone 22 is input to the transmission audio processing unit 14. When the recording unit 16 is operating, the transmission audio processing unit 14 receives an analog audio signal from the microphone 22 and a digital audio signal read from the recording unit 16. The transmission audio processing unit 14 includes an amplifier that amplifies the analog audio signal, an A / D converter that converts the analog audio signal into a digital audio signal, a filter that filters the digital audio signal, and a vocoder that encodes the filtered digital audio signal. Etc.

  The transmission voice processing unit 14 performs voice processing to transmit a voice signal by the transmission circuit 15 and generates a transmission voice signal. The transmission audio processing unit 14 first performs audio processing on the digital audio signal read from the recording unit 16, and then performs audio processing on the analog audio signal from the microphone 22 to generate a transmission audio signal.

  The recording unit 16 starts reproduction when a transmission state described later is set. The recording unit 16 increases the data volume of the reproduced digital audio signal from the recorded digital audio signal data, thereby increasing the speech speed of the read digital audio signal or shortening the silent portion. By playing back while recording using this technology, the recorded time is reduced. The transmission voice processing unit 14 switches to an analog signal from the microphone 22 when there is no recording signal and no data to be read out. That is, the transmission audio processing unit 14 performs audio processing on the digital audio signal read from the recording unit 16 and subsequently performs audio processing on the analog audio signal from the microphone 22.

  The transmission voice processing unit 14 does not always operate, but is configured to operate when a condition described later is satisfied. The transmission control unit 13 supplies the transmission voice processing unit 14 with a voice processing control signal for switching between operation and non-operation of the transmission voice processing unit 14. When the transmission voice processing unit 14 is operating, the transmission voice processing unit 14 supplies a transmission voice signal to the transmission circuit 15.

  The transmission circuit 15 includes a PLL (Phase Locked Loop) circuit for oscillating at a predetermined oscillation frequency, a power amplifier, and the like. When the transmission control signal is supplied from the transmission control unit 13, the transmission circuit 15 modulates the input transmission audio signal with the oscillation frequency oscillated by the PLL circuit and transmits it as a radio wave.

  Next, how the transmission control unit 13 controls each unit will be described using the state transition diagrams shown in FIGS. 3A to 3D. FIG. 3A shows the overall operation of the wireless communication device of this embodiment. Details of the states 201 to 203, 209 to 211, and 218 in FIG. 3A are shown in FIG. 3B. Details of states 204, 205, 212, 216, and 217 of FIG. 3A are shown in FIG. 3C. Details of states 206-208, 213-215 of FIG. 3A are shown in FIG. 3D.

  In FIG. 3B, the transmission control unit 13 waits for a distance determination signal interrupt so as to monitor the value of the distance determination signal in the state 201 that is in a standby state where reception and transmission are not performed. In the state 201, it is assumed that the position of the speaker microphone 20 is farther than the position of the distance D1 shown in FIG. 2A.

  When the user 30 brings the speaker microphone 20 close to himself / herself, the distance D becomes equal to or less than the distance D1, and the transmission control unit 13 is interrupted with a distance determination signal indicating that the distance D is equal to or less than the distance D1. 13 makes a transition to the state 202. The transmission control unit 13 activates the transmission voice processing unit 14 by operating the transmission voice processing unit 14 that is not operating in the state 202, and makes a transition to the state 203.

  In the state 203, the transmission control unit 13 further waits for a distance determination signal interrupt. When the user 30 further brings the speaker microphone 20 closer, the distance D becomes equal to or less than the distance D2, and the transmission control unit 13 is interrupted with a distance determination signal indicating that the distance D is equal to or less than the distance D2. Makes a transition to the state 204 shown in FIG. 3C.

  The transmission control unit 13 activates the recording unit 16 by operating the recording unit 16 that is inoperative in the state 204, and transits to the state 205. By enabling the recording unit 16, the recording unit 16 starts update recording and reading of the digital audio signal.

  In the state 205, the transmission control unit 13 further waits for a distance determination signal interrupt. When the user 30 further brings the speaker microphone 20 closer, the distance D becomes equal to or less than the distance D3, and the transmission control unit 13 is interrupted with a distance determination signal indicating that the distance D is equal to or less than the distance D3. Makes a transition to the state 206 shown in FIG. 3D.

  The transmission control unit 13 activates the sound pressure determination unit 11 by operating the sound pressure determination unit 11 that is not operating in the state 206, and makes a transition to the state 207. In the state 207, the transmission control unit 13 waits for the input of the sound pressure determination signal so as to monitor the value of the sound pressure determination signal.

  When the sound pressure determination signal indicating that the sound pressure is equal to or greater than the threshold value is input to the transmission control unit 13, the transmission control unit 13 supplies the transmission control signal to the transmission circuit 15 in the state 208 to transmit the transmission circuit 15. To transmit a transmission control signal from the transmission control unit 13.

  Returning to FIG. 3B, in the state 201, when the user 30 rapidly brings the speaker microphone 20 close to himself / herself, the distance D may be instantaneously less than or equal to the distance D2. In the state 201, when the distance determination signal indicating that the distance D is equal to or less than the distance D2 is interrupted in the transmission control unit 13, the transmission control unit 13 makes a transition to the state 209. The transmission control unit 13 activates the transmission voice processing unit 14 by operating the transmission voice processing unit 14 that is inoperative in the state 209, and transits to the state 204.

  In the state 201, if the user 30 rapidly brings the speaker microphone 20 close to himself / herself, the distance D may be instantaneously equal to or less than the distance D3. In the state 201, when the distance determination signal indicating that the distance D is equal to or less than the distance D3 is interrupted to the transmission control unit 13, the transmission control unit 13 makes a transition to the state 210. In the state 210, the transmission control unit 13 activates the transmission voice processing unit 14 by operating the transmission voice processing unit 14 that is not operating, and makes a transition to the state 212 illustrated in FIG. 3C.

  The transmission control unit 13 activates the sound pressure determination unit 11 by operating the sound pressure determination unit 11 that is not operating in the state 212, and makes a transition to the state 206 illustrated in FIG. 3D.

  When the user 30 depresses the PTT switch 21 in the state 201 shown in FIG. 3B, the transmission control unit 13 validates the transmission voice processing unit 14 in the state 211 in response to the input of the PTT signal, In the state 219 shown, the recording unit 16 is activated. Furthermore, the transmission control unit 13 activates the sound pressure determination unit 11 in the state 220 illustrated in FIG. In the state 208, the transmission control unit 13 supplies a transmission control signal to the transmission circuit 15 to operate the transmission circuit 15, and transmits the transmission control signal from the transmission control unit 13.

  In the state 203 shown in FIG. 3B, when the user 30 presses the PTT switch 21, the transmission control unit 13 activates the recording unit 16 in the state 221 shown in FIG. 3C in response to the input of the PTT signal. 3D, the sound pressure determination unit 11 is validated in the state 222 shown in FIG. In the state 208, the transmission control unit 13 operates the transmission circuit 15 to transmit a transmission control signal from the transmission control unit 13.

  When the user 30 presses the PTT switch 21 in the state 205 shown in FIG. 3C, the transmission control unit 13 responds to the input of the PTT signal and causes the sound pressure determination unit 11 in the state 223 shown in FIG. 3D. Enable and transition to state 208. In the state 208, the transmission control unit 13 operates the transmission circuit 15 to transmit a transmission control signal from the transmission control unit 13.

  In the state 207 shown in FIG. 3D, even when the user 30 presses the PTT switch 21, the transmission control unit 13 shifts to the state 208 and operates the transmission circuit 15 to transmit the transmission control signal from the transmission control unit 13. Send.

  In the state 208, when the sound pressure determination signal indicates silence and the PTT switch 21 is not in the pressed state, the transmission control unit 13 makes a transition to the state 207.

  In the state 207 shown in FIG. 3D, if the distance D exceeds the distance D3 and is less than the distance D2 before the sound pressure becomes equal to or higher than the threshold value or before the PTT switch 21 is pressed, the transmission control unit 13 Then, the state is changed to the state 213, the transmission voice processing unit 14 is invalidated, and the state is changed to the state 205 shown in FIG. 3C.

  In the state 207, if the distance D exceeds the distance D2 and is less than the distance D1 before the sound pressure becomes equal to or higher than the threshold value or before the PTT switch 21 is pressed, the transmission control unit 13 The process shifts to 214 to invalidate the transmission voice processing unit 14. Further, the transmission control unit 13 makes a transition to the state 216 shown in FIG. 3C, invalidates the recording unit 16, and makes a transition to the state 203.

  Further, in the state 207, if the distance D exceeds the distance D1 before the sound pressure becomes equal to or higher than the threshold value or before the PTT switch 21 is pressed, the transmission control unit 13 makes a transition to the state 215 and transmits. The voice processing unit 14 is invalidated and the recording unit 16 is invalidated by making a transition to the state 217 shown in FIG. 3C. Further, the transmission control unit 13 makes a transition to the state 218 shown in FIG. 3B, invalidates the transmission voice processing unit 14, and makes a transition to the state 201.

  In the state 205 shown in FIG. 3C, if the distance D exceeds the distance D2 and is less than the distance D1 before the distance D becomes less than or equal to the distance D3, the transmission control unit 13 makes a transition to the state 216 to make the recording unit 16 Invalidate and transition to the state 203 shown in FIG. 3B. If the distance D exceeds the distance D1 before the distance D becomes less than or equal to the distance D3, the transmission control unit 13 makes a transition to the state 217, invalidates the recording unit 16, and makes a transition to the state 218 shown in FIG. 3B. Let

  In the state 203 shown in FIG. 3B, if the distance D exceeds the distance D1 before the distance D becomes less than or equal to the distance D2, the transmission control unit 13 makes a transition to the state 218 to invalidate the transmission voice processing unit 14, Transition to state 201.

  FIG. 4 is a logical conceptual diagram showing conditions for the transmission control unit 13 to supply a transmission control signal to the transmission circuit 15 to operate the transmission circuit 15. The AND circuit 301 receives a sound pressure determination signal and a distance determination signal. Based on the sound pressure determination signal and the distance determination signal, a high output signal is input to the OR circuit 302 under the condition that the sound pressure determination signal indicates sound and the distance D is equal to or less than the distance D3.

  The OR circuit 302 receives the PTT signal and the output signal of the AND circuit 301. When the PTT signal is input to the OR circuit 302 or the high output signal is input, the OR circuit 302 supplies a transmission control signal to the transmission circuit 15.

  As described above, in the wireless communication device of the present embodiment, when the distance determination signal indicates that the distance is equal to or less than the first distance, the transmission control unit 13 causes the transmission audio processing unit 14 to transmit the audio signal from the microphone 22. An operation of generating a transmission voice signal by performing voice processing is started.

  When the distance determination signal indicates that the distance determination signal is equal to or less than the second distance shorter than the first distance, the wireless communication device according to the present embodiment starts the update recording and reading operations of the audio signal by the recording unit 16. When the recording unit 16 starts operating, the transmission audio processing unit 14 performs audio processing on the digital audio signal read from the recording unit 16 and the analog audio signal from the microphone 22 to generate a transmission audio signal.

  When the distance determination signal indicates that the distance determination signal is equal to or less than the third distance shorter than the second distance, the transmission control unit 13 causes the sound pressure determination unit 11 to transmit the sound from the microphone 22. The process for determining the sound pressure of the signal is started.

  The wireless communication device of the present embodiment has a sound pressure determination signal after starting an operation for generating a transmission sound signal, an operation for recording and reading an audio signal, and an operation for determining the sound pressure of the sound signal. When indicating that the sound is a sound, the transmission control unit 13 supplies a transmission control signal to the transmission circuit 15 so as to transmit the transmission voice signal as a radio wave.

  Therefore, according to the wireless communication device of the present embodiment, it is possible to appropriately determine the state in which the user of the wireless communication device intends to transmit audio and switch the wireless communication device to the transmission state.

  According to the wireless communication device of the present embodiment, when the distance determination signal indicates that the distance is equal to or less than the first distance, since the process of generating the transmission voice signal by the transmission voice processing unit 14 is started, the voice to be transmitted It is possible to reduce so-called head breaks.

  In addition to this, the wireless communication apparatus of the present embodiment includes the recording unit 16, and when the distance determination signal indicates that the distance is equal to or less than the second distance, the sound pressure determination signal is equal to or higher than a predetermined threshold. Record the audio signal before indicating. The transmission circuit 15 transmits the sound from the microphone 22 following the sound before reaching the predetermined threshold recorded by the recording unit 16. Therefore, according to the wireless communication device of the present embodiment, it is possible to almost eliminate the head cut.

  The transmission control unit 13 deactivates the transmission voice processing unit 14 when the distance determination signal indicates that the distance exceeds the first distance, and does not operate when the distance determination signal indicates that the distance determination signal is equal to or less than the first distance. It is preferable to operate the transmission voice processing unit 14. In this way, the transmission audio processing unit 14 is inactive except when necessary, so that power consumption can be reduced.

  The transmission control unit 13 deactivates the recording unit 16 when the distance determination signal indicates that the distance exceeds the second distance, and deactivates when the distance determination signal indicates that the distance determination signal is equal to or less than the second distance. It is preferable to operate the recording unit 16. In this way, since the recording unit 16 is inactive except when necessary, power consumption can be reduced.

  The transmission control unit 13 deactivates the sound pressure determination unit 11 when the separation determination signal indicates that the distance exceeds the third distance, and does not operate when the distance determination signal indicates that the distance determination signal is equal to or less than the third distance. It is preferable to operate the sound pressure determination unit 11. In this way, since the sound pressure determination unit 11 is inactive except when necessary, power consumption can be reduced.

  The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Main body part 11 Sound pressure determination part 12 Distance determination part 13 Transmission control part 14 Transmission audio | voice processing part 15 Transmission circuit 16 Recording part 20 Speaker microphone 21 PTT switch 22 Microphone 23 Distance sensor

Claims (5)

A sound pressure determination unit that determines the sound pressure of the sound signal from the microphone and generates a sound pressure determination signal;
Distance determination for generating a distance determination signal by determining a distance from the wireless communication device to the user based on a detection value corresponding to a distance from the wireless communication device generated by the distance sensor to the user of the wireless communication device And
A recording unit for recording an audio signal from the microphone updated for a predetermined time; and
A transmission audio processing unit that generates a transmission audio signal by performing audio processing on the audio signal from the microphone following the audio signal read from the recording unit;
A transmission circuit for transmitting the transmission audio signal as a radio wave;
A transmission controller that monitors the sound pressure determination signal and the distance determination signal;
With
The transmission control unit
When the distance determination signal indicates that it is equal to or less than the first distance, the operation of the transmission voice processing unit is started,
When the distance determination signal indicates that the distance is equal to or less than a second distance shorter than the first distance, the audio signal is updated and recorded and read out by the recording unit.
When the distance determination signal indicates that it is equal to or less than a third distance shorter than the second distance, the sound pressure determination unit starts an operation of determining the sound pressure of the sound signal from the microphone,
When the sound pressure determination signal indicates that the sound pressure is equal to or higher than a predetermined threshold, the transmission includes the audio signal read from the recording unit and the audio signal from the microphone, which is generated by the transmission audio processing unit. A wireless communication device, wherein a transmission control signal is supplied to the transmission circuit so as to transmit an audio signal as a radio wave. The transmission control unit
When the distance determination signal indicates that it exceeds the first distance, the transmission voice processing unit is disabled,
The wireless communication device according to claim 1, wherein when the distance determination signal indicates that the distance is equal to or less than the first distance, the non-operating transmission voice processing unit is operated. The transmission control unit
When the distance determination signal indicates that the second distance is exceeded, the recording unit is disabled,
The wireless communication device according to claim 2, wherein when the distance determination signal indicates that the distance is equal to or less than the second distance, the recording unit that is not operating is operated. The transmission control unit
When the distance determination signal indicates that the third distance is exceeded, the sound pressure determination unit is disabled.
The wireless communication device according to claim 3, wherein when the distance determination signal indicates that the distance is equal to or less than the third distance, the sound pressure determination unit that is not operating is operated. The sound pressure determination unit
If the sound signal is a sound pressure equal to or higher than a predetermined threshold, a sound pressure determination signal indicating sound is generated, and if the sound pressure is lower than the predetermined threshold, a sound pressure determination signal indicating silence is generated.
The sound pressure determination signal indicating the presence of sound for a predetermined time is maintained when the sound pressure of the audio signal becomes less than the predetermined threshold after reaching the predetermined threshold or more. 5. The wireless communication device according to any one of 4 above.

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