JPH09307626A - Loud speaking information communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct inexpensively loud speaking information communication such as video conference with lots of number of participants in a large hall and to attain exchange of voice information from a remote location by providing a frequency division section and a gain adjustment device by which a loop gain is the unity or below as to a speech voice transmitted to audience in a hall and a remote opposite party. SOLUTION: When a speech A is inputted through a microphone 4 installed in a large hall 1, the speech A is heard by audience in the large hall 1 and its loop gain is set to be the unity or below via a gain adjustment device 15. Furthermore, the speech A whose loop gain is set to the unity or below is transmitted to a remote party B via a voice CODEC 6. Moreover, the speech A has a loop gain to be the unity or below by passing the loudspeaking voice heard by the audience in the large hall 1 through a frequency division section 14. The loudspeaking voice outputted from the frequency division section 14 is added to a speech B from the talker B outputted via the voice CODEC 6 at an adder 16 and the resulting voice is outputted from a speaker 3 in the large hall 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker information communication system used for a room sound field control device and a voice communication conference device.

[0002]

2. Description of the Related Art Generally, a loudspeaker information communication system such as a video conference system uses an acoustic echo canceller that eliminates echo caused by acoustic coupling of speaker's voice, which is composed of a variable coefficient filter and a subtraction circuit for generating pseudo acoustic echo. There is. A room sound field control device such as a PA system in a large venue uses a filter to prevent howling.
This will be described with reference to the drawing of FIG. When the speech A from the speaker A is input through the microphone 4 installed in the large hall 1, the speech A is heard by the audience in the large hall 1, and the speech A has a loop gain of 1 or less by the howling prevention device 2. Becomes Therefore, the voice of the speech A passes through the frequency division unit and the gain adjuster of the howling prevention apparatus 2 so that the loop gain becomes 1
The following is output from the speaker 3.

Next, referring to the drawing of FIG. 3, when the speech A from the speaker A is input through the microphone 4 installed in the large hall 1, the talk is at a distance via the voice codec 6. Person B is transmitted. Further, the speech B from the speaker B is output from the speaker 3, added with the speech A, and input to the echo prevention device 5. Speech B is echo canceled by each echo prevention device, and speech A
Only sent to the other party.

[0004]

DISCLOSURE OF THE INVENTION The present invention has the problem that in a loudspeaker information communication system such as the above-mentioned video conference system, the voice of the speaker at the near end becomes more difficult to hear as the distance from the speaker increases. It is an object of the present invention to solve the problem by using a loudspeaker to make a loud sound and to eliminate the echo prevention device used in the conventional loudspeaker information communication system. Further, another object of the present invention is to enable a device, which has been limited to use at one point, to communicate with a remote place in the room sound field control device such as the above-mentioned PA system.

[0005]

DISCLOSURE OF THE INVENTION The present invention is to solve these problems, in which a voice of a nearby speaker is amplified to an audience in a room and the voice is separated by a video conference device. Microphone for inputting voice, transmission signal amplifying circuit for amplifying voice input from the microphone, and microphone signal amplifying circuit A voice signal encoding circuit for transmitting the voice amplified by the remote party, a reception signal decoding circuit for receiving the voice from the remote party, and an amplification of the voice of the reception signal decoding circuit And a howling prevention filter for preventing howling, which receives the transmission signal output from the transmission signal amplification circuit as an input, A frequency division unit for reducing the loop gain when the voice is amplified indoors to 1 or less by the anti-filtering filter, and a loop gain when the voice is output to a remote terminal on the other side for the howling prevention filter. There is provided a loudspeaker information communication system including a gain adjuster as described below, and an adder circuit for adding the output of the howling prevention filter and a reception signal output from the reception signal decoding circuit.

[0006]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a loudspeaker information communication system showing an embodiment of the present invention. In FIG. 1, 1 is a large hall, 2 is a howling prevention device, 3 is a speaker, 4 is a microphone, 6 is a voice codec, 10 is a microphone signal amplification circuit, 11 is a transmission signal coding circuit, and 12 is a reception signal decoding circuit. , 13 is a reception signal amplifier circuit, 14 is a frequency division unit, 15 is a gain adjuster, and 16 is an adder. The operation of the loudspeaker information communication system according to the present invention will be described with reference to FIG. When the speech A from the speaker A is input through the microphone 4 installed in the large hall 1, the speech A is heard by the audience in the large hall 1 and the gain adjuster 15 built in the howling prevention device 2 is provided. The loop gain becomes 1 or less by passing through. Further, the speech A whose loop gain has become 1 or less by the gain adjuster 15 is transmitted to the distant speaker B via the voice codec 6. Further, in the case of the speech A, the loud sound heard by the audience in the large venue 1 also passes through the frequency division unit 14 incorporated in the howling prevention apparatus 2, so that the loop gain becomes 1 or less. The loud sound output from the frequency division unit 14 is
The speech B from the speaker B of the other party's terminal is added by the adder 16 to the one output via the voice codec 6 and output from the speaker 3 of the grand hall 1.

[0007]

As described above, according to the present invention, both the voice heard by the audience at the large venue and the voice transmitted to the other party at a remote place have a loop gain of 1 or less. By providing the frequency division unit and the gain adjuster, the following effects are achieved.

(1) Since the voice of the near-end talker is amplified by the loudspeaker, the loudspeaker information communication such as a video conference of a large number of people using a large room can be realized.

(2) An inexpensive system can be realized because the expensive acoustic echo canceller used in the conventional voice information communication such as a video conference is not used.

(3) By using this system as a substitute for a conventional room sound field control device such as a PA system,
It is possible to exchange voice information with remote locations.

[Brief description of drawings]

FIG. 1 is a block diagram of a loudspeaker information communication system showing an embodiment of the present invention.

FIG. 2 is a block diagram of a PA system, which is a conventional public address information communication system.

FIG. 3 is a block diagram of a TV conference system, which is a conventional public address information communication system.

[Explanation of symbols]

 1 Large Venue 2 Howling Prevention Device 3 Speaker 4 Microphone 5 Echo Prevention Device 6 Voice Codec 10 Microphone Signal Amplifying Circuit 11 Transmission Signal Encoding Circuit 12 Reception Signal Encoding Circuit 13 Reception Signal Amplification Circuit

Claims (1)

[Claims] 1. A loudspeaker information communication system for amplifying a voice of a nearby speaker to an audience in a room and transmitting / receiving the voice to / from a remote party using a video conference device. A microphone for input,
A transmission signal amplification circuit for amplifying the voice input from the microphone, a transmission signal encoding circuit for transmitting the voice amplified by the microphone signal amplification circuit to a remote party, and a remote party. The receiving signal decoding circuit for receiving the voice from the side, the receiving signal amplifying circuit for amplifying the voice of the receiving signal decoding circuit, and the transmitting signal output from the transmitting signal amplifying circuit are input. An anti-howling filter for the purpose of preventing howling, a frequency division unit that makes the loop gain when the audio is amplified in the room to be 1 or less, and the audio is output to a remote terminal on the other side. The gain adjuster that sets the loop gain to 1 or less at the time of addition, the output of the howling prevention filter, and the reception signal output from the reception signal decoding circuit are added. Loudspeaker information communication system, characterized in that is composed of a fit of the adder circuit.