JPH11298595A - Communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily listen to the voice of a communicating party while drowning out surrounding noises by providing a sound collector for collecting surrounding sounds and a loudspeaker for sounding a received audio signal as a voice, generating an audio signal for canceling the sounds collected by the sound collector, synthesizing it with the received audio signal and generating a synthe sized audio signal from the loudspeaker as a voice. SOLUTION: A radio wave from communication equipment on the side of the party is converted to an audio signal by an antenna 1, a reception circuit 21 and a decoder circuit 22 and sent to a synthesizer circuit 34. Sounds around a transmitter are collected by a peripheral sound collector 31 and the audio signal is sent to the synthesizer circuit 34 while inverting its phase through a phase inverter circuit 32 and matching its timing with the original audio signal through a delay circuit 33. The synthesizer circuit 34 synthesizes the audio signal from the delay circu it 33 and the audio signal of the communicating party from the decoder circuit 22 and outputs the result to a loudspeaker 23. Thus, the sounds around the transmitter are drowned out by the sound of the inverse phase generated by the loudspeaker 23 and the transmitter can listen to the voice of the communicating party well.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication apparatus, and more particularly, to a communication apparatus which uses a reverse phase wave of voice to improve sound quality and quietness of conversation.

[0002]

2. Description of the Related Art FIG. 6 is a block diagram showing the configuration of a conventional communication apparatus.
Is a sound collector that collects the voice of the sender and converts the voice into a voice signal, 12 is a coding circuit that converts the voice signal into an electric signal, and 13 is an antenna that converts the electric signal into a transmission signal and converts the signal into a transmission signal. A transmission circuit 21 for transmitting a signal received from the antenna 1 to an electric signal;
Reference numeral 2 denotes a decoding circuit for converting the electric signal output from the receiving circuit 21 into a voice signal, and reference numeral 23 denotes a loudspeaker for converting the voice signal into voice and emitting the voice. Here, the “electric signal” is a digital signal or the like that is subjected to signal processing in the transmission and reception of audio, and is a signal other than a high-frequency signal that is a transmission and reception signal and an analog signal (audio signal) corresponding to audio input and output to and from the device. And the same meaning is used below.

Next, the operation of the conventional communication device having the above configuration will be described. At the time of transmission, the sound is collected by the sound collector 11, and the sound is converted into a sound signal and sent to the encoding circuit 12. The encoding circuit 12 converts the audio signal into an electric signal, and the transmitting circuit 13 converts the electric signal into a radio signal, and transmits the radio signal from the antenna 1 to a communication device (not shown) as a transmission radio wave. At the time of reception, a radio wave transmitted from the communication device of the other party is received by the antenna 1, and the reception device 21 converts the reception signal into an electric signal. The electric signal is converted into an audio signal by the decoding circuit 22 and then converted into audio by the loudspeaker 23 and output. In a conventional communication device, a telephone call is performed by repeating the above.

[0004]

However, the conventional communication apparatus having the above-described structure has a problem that it is difficult to hear the voice of the communication partner in a place where there is much noise. On the other hand, in a relatively quiet place, the voice of the talker is easily transmitted to the surroundings, so that there is a problem that the surrounding people are troubled.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has a function of eliminating surrounding noise to make it easy to hear the voice of a communication partner, or to prevent a voice of a transmitter from reaching the surroundings. It is an object to provide a communication device having a function.

[0006]

According to a first aspect of the present invention, there is provided a communication apparatus comprising: a sound collector for collecting surrounding sounds; and a loudspeaker for emitting a received sound signal as sound. A sound signal for canceling the sound collected by the sound device is generated and combined with the received sound signal, and the synthesized sound signal is emitted as sound from the loudspeaker.

According to a second aspect of the present invention, there is provided a communication apparatus including a sound collector for collecting a voice of a sender, and a loudspeaker for emitting a voice around the speaker, wherein the sound is collected by the sound collector. An audio signal for canceling the generated audio is generated, and the generated audio signal is emitted from the loudspeaker as audio.

According to a third aspect of the present invention, there is provided a communication device comprising: a sound collector for collecting a bone transmission sound of a transmitter; and a loudspeaker for generating a voice around the transmitter. The generated voice signal is transmitted to the other party as a voice signal, and a voice signal for canceling the voice collected by the sound collector is generated, and the generated voice signal is emitted from the loudspeaker as voice. is there.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In the following description, portions common to the conventional example will be described using the same reference numerals.

Embodiment 1 FIG. 1 is a block diagram showing a configuration of a communication apparatus according to Embodiment 1 of the present invention, wherein 1 is an antenna for transmitting and receiving communication radio waves, 11 is for collecting a voice of a sender and converting the voice into a voice signal. A sound collector for conversion, 12 is a coding circuit for converting the audio signal into an electric signal, 13 is a transmission circuit for converting the electric signal into a transmission signal and transmitted from the antenna 1, and 21 is received by the antenna 1 A receiving circuit for converting a received signal into an electric signal;
A decoding circuit for converting an electric signal output from 1 into an audio signal, 31 is an ambient sound collector that is a sound collector that collects sounds around the sender, and 32 is an ambient sound collector 31 33, a delay circuit for delaying the audio signal from the phase inversion circuit 32; and 34, the audio signal from the decoding circuit 22 and the audio signal from the delay circuit 33. Is a loudspeaker which converts the audio signal synthesized by the synthesizing circuit 34 into voice and emits the voice.

The communication apparatus according to the first embodiment cancels the surrounding sound by utilizing the time difference of the sound wave propagating in the air, and silences the surroundings of the transmitter. The speaker 41 is installed at a location A remote from the installation location B of the loudspeaker 23 for the speaker to hear the voice transmitted by the communication partner. Here, assuming that the time at which the surrounding sound reaches the ambient sound collector 41 at the place A is a and the time at which the surrounding sound reaches the loudspeaker 23 at the place B is b, the above-described sound passes between AB. The propagation time T is Tp = ba. The time from when the surrounding sound reaches the surrounding sound collector 41 until the sound is processed in the communication device and output as sound from the loudspeaker 23 is Tq. The distance between AB is set so that Tq <Tp. Then, in order to match the timing of the surrounding sound and the sound output from the loudspeaker 23, the delay circuit 33 sets a delay time of Δt = Tp−Tq with respect to the sound signal from the phase inversion circuit 32. Set. Note that Tp is T = L / L where M is the propagation speed of sound in the air and L is the distance between AB.
M, the delay time Δt is Δt = (L / M) −T
Just set it to q.

In the communication device having the above configuration, at the time of transmission, sound is collected by the sound collector 11, the sound is converted into a sound signal, and sent to the encoding circuit 12. The encoding circuit 12 converts the audio signal into an electric signal, and the transmitting circuit 13 converts the electric signal into a transmission signal, and transmits the signal as a radio wave from the antenna 1 to a communication device (not shown). Next, the operation at the time of reception will be described with reference to FIG. The radio wave transmitted from the communication device on the other end is received by the antenna 1, converted into an electric signal in the receiving device 21, converted into an audio signal in the decoding circuit 22, and then sent to the synthesizing circuit 34 (waveform in FIG. S). On the other hand, the voice around the sender (waveform N in the figure)
Is collected by a peripheral sound collector 31, and the audio signal is inverted in phase by a phase inverting circuit 32, so that the peripheral sound collector 31
Then, an audio signal (waveform R in the figure) having a phase opposite to that of the audio collected in (1) is generated. This audio signal is sent to the delay circuit 33 and is delayed by the above-mentioned delay time Δt so as to match the timing with the original audio signal.
(Waveform D in the figure). The synthesizing circuit 34 synthesizes the audio signal sent from the delay circuit and the audio signal sent from the communication partner sent from the decoding circuit 22,
The synthesized voice signal (waveform K in the figure) is transmitted to a loudspeaker 23.
Output to The loudspeaker 23 outputs the synthesized voice signal as voice. Since the voice around the sender (waveform Nd in the same figure) is canceled by the opposite-phase voice emitted from the loudspeaker 23, the sender can hear only the voice transmitted by the other party (the waveform in the same figure). W), the sender can hear the voice transmitted by the other party well.

Embodiment 2 FIG. FIG. 3 is a block diagram showing a configuration of a communication apparatus according to Embodiment 2 of the present invention, wherein 1 is an antenna for transmitting and receiving communication radio waves, 11 is for collecting a voice of a sender and converting the voice into a voice signal. A sound collector for conversion, 12 is a coding circuit for converting the audio signal into an electric signal, 13 is a transmission circuit for converting the electric signal into a transmission signal and transmitted from the antenna 1, and 42 is a transmission circuit from the sound collector 11. A phase inversion circuit for inverting the phase of the voice signal of the sender, 43 a delay circuit for delaying the audio signal from the phase inversion circuit 42, and 44 converting the audio signal from the delay circuit 42 into audio and emitting the audio A peripheral loudspeaker, 21 is a receiving circuit for converting a received signal received by the antenna 1 into an electric signal, 22 is a decoding circuit for converting an electric signal output from the receiving circuit 21 into a voice signal, and 23 is a decoding circuit. Audio signal It converted to voice a loudspeaker that emits the sound.

The communication apparatus according to the second embodiment is for preventing the voice of the sender from being transmitted to the surroundings. The sound collector 11 for inputting the voice to be transmitted to the other party is installed at a location A remote from the installation location B, and when the voice of the sender reaches the location A, the peripheral loudspeaker 44 It is configured to output a sound that cancels the sound. The delay circuit 43 applies Δt = L / M to the sound signal from the phase inversion circuit 42 in the same manner as in the first embodiment.
The audio signal is delayed by setting a delay time determined by −t.

Next, the transmission operation of the communication device having the above configuration will be described with reference to FIG. At the time of transmission, the sound of the sender (waveform S in the figure) is collected by the sound collector 11, and the sound is converted into an audio signal and sent to the encoding circuit 12. The encoding circuit 12 converts the audio signal into an electric signal,
The transmission circuit 13 converts the electric signal into a transmission signal and transmits the electric signal from the antenna 1 as a radio wave to a communication device (not shown). On the other hand, the voice signal of the transmitter output from the sound collector 11 is converted into a voice signal (waveform R in FIG. 4) having the opposite phase to the voice signal by the phase inversion circuit 42, The signal is delayed by the above-mentioned delay time Δt (waveform D in the figure) so as to match the timing with the original audio signal, and is emitted from the peripheral loudspeaker 44 to the surroundings as audio. Accordingly, the voice of the sender is canceled around the peripheral loudspeaker 44, and the voice of the sender is not transmitted to the surroundings (waveform W in FIG. 4). Therefore, the quietness of the conversation can be enhanced, and the voice of the sender can be prevented from disturbing the surrounding people. At the time of reception, a radio wave transmitted from a communication device on the other end is received by the antenna 1, and the reception signal is converted into an electric signal by the reception device 21.
The audio signal is converted by the decoding circuit 22 and output to the loudspeaker 23. The loudspeaker 23 outputs the audio signal as audio.

Embodiment 3 In the second embodiment, the voice signal of the sender input to the sound collector 11 is inverted and delayed and output from the peripheral loudspeaker 44. However, in the third embodiment of the present invention, As shown in FIG. 5, in place of the sound collector 11, the output from the bone conduction sound collector 51, which is a sound collector that extracts the bone conduction sound of the sender as a voice signal, is transmitted to the other party. The audio signal is inverted, delayed, and output from the peripheral loudspeaker 44. When the voice of the sender is extracted from the bone conduction sound transmitted from the sender when the speaker speaks, the voice signal is output to the encoding circuit 11 as compared with the case where the sound is collected by the sound collector 11. Since the time until inputting can be shortened, the time T until the sound is signal-processed in the communication device and output as sound from the loudspeaker 44 is output.
q can be shortened. Therefore, since the peripheral loudspeaker 44 can be installed closer to the speaker,
The quietness of conversation can be further improved.

[0017]

As described above, the communication device according to the first aspect of the present invention generates a sound signal for canceling the sound collected by the sound collector that collects surrounding sounds, and receives the sound signal together with the sound signal. Since the loudspeaker is synthesized with the synthesized audio signal, the surrounding noise is eliminated and the voice of the transmission partner can be clearly heard.

According to the communication device of the present invention, a voice signal for canceling the voice collected by the sound collector is generated, and the generated voice signal is transmitted from the loudspeaker as voice. The voice of the person does not reach the surroundings, and the quietness of the conversation can be further enhanced.

In the communication device according to the present invention, the signal processing time is shortened by using a sound collector for converting bone conduction sound into voice as the sound collector. Can be installed closer to the room, and the quietness of conversation can be further enhanced.

[Brief description of the drawings]

FIG. 1 is a block diagram of a communication device according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram of an audio waveform and an audio signal waveform according to the first embodiment of the present invention.

FIG. 3 is a block diagram of a communication device according to a second embodiment of the present invention.

FIG. 4 is a schematic diagram of an audio waveform and an audio signal waveform according to Embodiment 2 of the present invention.

FIG. 5 is a block diagram of a communication device according to a third embodiment of the present invention.

FIG. 6 is a block diagram of a conventional communication device.

[Explanation of symbols]

1 antenna, 11 sound collector, 12 code circuit, 13
Transmission circuit, 21 reception circuit, 22 decoding circuit, 23 loudspeaker, 31 peripheral sound collector, 32, 42 phase inversion circuit, 33, 43 delay circuit, 34 synthesis circuit, 44 peripheral loudspeaker, 51 bone conduction sound collection Sound equipment

Claims (3)

[Claims] A sound collector that collects surrounding sounds; and a loudspeaker that emits a received sound signal as sound, and generates a sound signal for canceling the sound collected by the sound collector. A communication device, comprising: synthesizing a received audio signal; and transmitting the synthesized audio signal as audio from the loudspeaker. 2. A sound collector for collecting a voice of a sender, and a loudspeaker for emitting a voice around the speaker, and generating a voice signal for canceling the voice collected by the sound collector. A communication device wherein the generated voice signal is emitted as voice from the loudspeaker. 3. A sound collector for collecting a bone conduction sound of a transmitter,
A loudspeaker that emits a voice around the speaker, transmits the voice input to the sound collector as a voice signal to the other party, and generates a voice signal for canceling the voice collected by the sound collector. A communication device wherein the generated voice signal is emitted as voice from the loudspeaker.