JPH0537653A - Audio level adjustment system in remote conference system - Google Patents

Abstract

PURPOSE:To adjust sound volume of a local microphone and a local speaker of a conference room at each district automatically in a short time with a simple operation by applying feedback depending on an audio signal level adjusted in advance so as to adjust the sound volume of the speaker thereby adjusting the sound volume of the microphone. CONSTITUTION:This system consists of a reference audio signal generator 10, a changeover circuit 20 selecting a reference voice signal 101 at test, a control circuit 40 generating a speaker sound volume adjustment control signal 401, a reference microphone 60 whose adjustment is already finished, a microphone sound volume adjustment amplifier 80 and a microphone sound volume adjustment circuit 90. A reference audio signal is generated and a sound is outputted from the speaker 50 and feedback is applied based on an audio signal level generated from the reference microphone 60 adjusted in advance to adjust the sound volume of the speaker 50 and the sound volume of the microphone is adjusted so that the audio level generated by the microphone 70 used actually reaches a preset value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio level adjusting method in a remote conference system, and more particularly to an audio level adjusting method for a microphone and a speaker which is locally performed at each point.

[0002]

2. Description of the Related Art In the conventional audio level adjustment method, first, a human being speaks in front of a microphone at each point and manually receives an audio signal from the microphone, and adjusts the volume by operating the volume while watching the level maker. After that, each point was connected, and the volume of the speaker on the local station was adjusted while listening to the human voice on the local side while the human speaking on the other side.

[0003]

In this conventional voice level adjusting method, it is necessary for trained humans to go to each point at the same time, and it takes time for the adjustment, and the human beings have a variation in the adjustment result. There was a problem.

[0004]

The audio level adjusting system of the present invention comprises a reference audio signal generator (10) for generating a reference audio signal (101) for a volume adjustment test, and an audio signal received from each point. The reference sound signal is the first volume adjustment test control signal (21)
A switching circuit (20) for switching by, and a speaker volume adjusting amplifier (30) capable of inputting an audio signal (201) from the switching circuit and varying the amplification degree by a speaker volume control signal (401),
A speaker (50) that inputs the output sound signal (301) of the speaker volume adjustment amplifier and converts it into sound, and a pre-adjusted reference microphone (60) that converts the sound of the speaker output into the reference sound signal (601). , The microphone (70) that converts the sound of the speaker output into an audio signal, the output audio signal of the speaker volume adjustment amplifier and the audio signal from the reference microphone are input, and the second volume adjustment test control signal (31) is input. During the test period, the speaker volume control signal is output so that the relationship between the two input audio signal levels is determined and the speaker volume control signal is maintained after the test period. Output from the comparison circuit (40) and the audio signal from the microphone
(701) and the microphone volume adjustment amplifier (80) that changes the amplification degree by the microphone volume adjustment signal (901), and the audio signal of the output of the microphone volume adjustment amplifier are input, and the third volume adjustment test is performed. The microphone volume adjustment circuit (9) that outputs the microphone volume adjustment signal so that the input audio signal from the microphone becomes the specified level only during the test period when the control signal (51) is input.
0) and.

[0005]

[Function] A reference voice signal is generated, a voice is output from a speaker, and the volume of the speaker is adjusted by feedback according to the voice signal level converted by a reference microphone that is adjusted in advance. The volume of the microphone is adjusted so that the converted voice level becomes a predetermined value. As a result, the volume of the local microphone and speaker in the conference room at each point can be automatically adjusted in a short time by a simple operation.

[0006]

The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a time chart explaining its operation. In these figures, the reference voice signal generator 10 generates a reference voice signal 101 for a volume adjustment test. The switching circuit 20 receives the audio signal 11 received from each point from the input terminal 1 and the reference audio signal 101 from the reference audio signal generator 10 according to the first volume adjustment test control signal 21 input from the input terminal 2. Switch. The speaker volume adjusting amplifier 30 inputs the audio signal 201 from the switch 20, and changes the amplification degree by the speaker volume control signal 401 to change the audio signal 301.
Is output. The comparison circuit 40 inputs the audio signal 301 from the speaker volume adjustment amplifier 30 and the audio signal 601 from the reference microphone 60, and outputs the second volume adjustment test control signal 31 from the input terminal 3 for the speaker volume adjustment period only. The speaker volume control signal 401 is output so that the relationship between the two input audio signal levels of the above can be established.

After the speaker volume adjustment, the speaker volume control signal 401 determined during the speaker volume adjustment period is held and output. The speaker 50 converts the audio signal 301 from the speaker volume adjusting amplifier 30 into audio. The reference microphone 60 is a microphone that converts the voice output from the speaker into the reference voice signal 601, and is a microphone that is adjusted in advance. Microphone 7
0 is a microphone that is normally used and is installed at each point, and converts the sound output from the speaker into a sound signal 701. The microphone volume adjusting amplifier 80 is provided with an audio signal 701 from the microphone 70.
Is input, the amplification degree is changed by the microphone volume adjustment signal 901, and the audio signal 41 is output to the output terminal 4. The microphone volume adjusting circuit 90 inputs the audio signal 41 from the microphone volume adjusting amplifier 80, and the input audio signal 701 is determined only during the microphone volume adjusting period by the third volume adjusting test control signal 51 from the input terminal 5. The microphone volume adjustment signal 901 is output so that the level becomes different, and after the microphone volume adjustment period ends, the microphone volume adjustment signal 901 determined during the microphone volume adjustment period is held and output.

FIG. 3 is a system configuration diagram showing an example of a remote conference system including the embodiment of the present invention shown in FIG. In the figure, the remote conference control device 100 inputs a voice signal or an image signal from a plurality of grounds, performs switching control or synthesis control, and distributes to each ground. The encoding device 110 encodes and decodes an audio signal, an image signal, and the like. The voice control terminal 120 is a device including the circuit shown in FIG. The speaker 130 is the speaker 50 of FIG. 1, and the reference microphone 140 is the same as the reference microphone 6.
0, the microphone 150 also corresponds to the microphone 70, respectively. Although not shown, the terminals 2, 3 ... Are respectively equipped with the same terminals as the terminals 1.

[0009]

As described above, according to the present invention, the reference sound signal is generated and the sound is output from the speaker, and the sound volume of the speaker is adjusted by feedback according to the sound signal level converted by the previously adjusted reference microphone. After performing, adjust the microphone volume so that the audio level converted by the microphone actually used becomes a predetermined value, and with a simple operation, the local of the conference room at each point will be automatically This has the effect of enabling volume adjustment of various microphones and speakers.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a time chart explaining the operation of FIG.

FIG. 3 is a system configuration diagram showing an example of a remote conference system including the device of the embodiment of FIG.

[Explanation of symbols]

 10 Reference Audio Signal Generation Circuit 11 Audio Signal 20 Switching Circuit 21 First Volume Adjustment Test Control Signal 30 Speaker Volume Adjustment Amplifier 31 Second Volume Adjustment Test Control Signal 40 Comparison Circuit 41 Audio Signal 50 Speaker 51 Third Volume Adjustment Test control signal 60 Reference microphone 70 Microphone 80 Microphone volume adjusting amplifier 90 Microphone volume adjusting circuit 101 Reference voice signal 201 Voice signal 301 Voice signal 401 Speaker volume control signal 601 Reference voice signal 701 Voice signal 901 Microphone volume control signal

Claims (1)

Claims: 1. A volume adjustment method for a speaker or a microphone installed in a conference room at each point in a video conference system or a voice conference system between two or more remote points, for a volume adjustment test. A reference voice signal generator that generates a reference voice signal, a switching circuit that switches the voice signal received from each point and the reference voice signal by the first volume adjustment test control signal, and the voice signal from this switching circuit are input. A speaker volume adjusting amplifier that changes the amplification degree by a speaker volume control signal, a speaker that inputs an output audio signal of the speaker volume adjusting amplifier and converts it into a sound, and a speaker output sound that is converted into a reference sound signal in advance. Adjusted reference microphone, microphone for converting voice of speaker output into audio signal, and output of amplifier for speaker volume adjustment The voice signal and the voice signal from the reference microphone are input, and the test period in which the second volume adjustment test control signal is input is such that the relationship is determined by comparing the two input voice signal levels. After the test period, the speaker volume control signal is output, and after the test period, the comparison circuit that holds and outputs the speaker volume control signal determined during the test period and the voice signal from the microphone are input and the amplification level is adjusted by the microphone volume control signal. A variable microphone volume adjusting amplifier and an audio signal output from the microphone volume adjusting amplifier are input, and an input audio signal from the microphone is determined only during a test period in which a third volume adjustment test control signal is input. And a microphone level adjusting circuit that outputs the microphone level adjusting signal so that the level is adjusted to a desired level. formula.