JP3592879B2 - Voice information communication system and multipoint control device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a multifunctional and miniaturized voice information communication system including a plurality of voice information communication terminals and a control device that controls them.
[0002]
[Prior art]
FIG. 4 is a basic configuration diagram showing an example of a conventional voice information communication system. In general, a voice information communication system 40 including a multipoint control device 42 to which a plurality of voice information communication terminals 41A to 41N are connected corresponds to the voice information communication terminals 41A to 41N in the multipoint control device 42, respectively. The common audio decoder 43 is provided. The audio signal collected from the microphone 44 connected to each of the audio information communication terminals 41A to 41N is converted into a digital signal by each terminal, encoded, and transmitted to the multipoint control device 42. The coded voice transmitted from each of the voice information communication terminals 41A to 41N to the multipoint control device 42 is reconstructed into a digital voice signal by the decoder 43 in the multipoint control device 42. It is added by the voice synthesis circuit 45. After this synthesized speech is encoded by the encoder 46, it is transmitted to the speech information communication terminals 41A to 41N.
[0003]
[Problems to be solved by the invention]
However, in the above-described conventional audio information communication system, appropriate level adjustment corresponding to a plurality of different audio coding schemes is not performed, and the background noise inherent in the synthesized audio signal increases, thereby deteriorating the audio quality. There is a problem that smooth voice information communication cannot be performed. The present invention has been made in view of the above points, and provides a high-quality voice information communication system that eliminates the above problems, improves the quality of call voice, and improves intelligibility.
[0004]
[Means for Solving the Problems]
The present invention has been made to solve these problems, and has a one-to-one correspondence with a video conference terminal device, and is intended to input coded data sent from each video conference terminal device in a predetermined coding method. , A first data storage unit corresponding to each of the data input units, and for storing each encoded data, and a first data storage unit stored in the first data storage unit. In a multipoint high-quality audio information communication system comprising an arithmetic processing unit for adding each of the encoded data, and decoding means for decoding the encoded data added by the arithmetic processing unit, A speech coding scheme determining circuit for determining a decoding scheme based on coding scheme information inserted into the code data input to the data input section, wherein the first data Read the encoded data stored in the data storage unit Its read encoded data and provides the voice encoding scheme is adjusted to an amplitude suitable for each coding method based on the determination circuit voice information communication system to be decoded.
[0005]
Further, a sampling frequency of the decoded audio signal at each point is converted into a substantially constant frequency, and the audio signal of the fixed frequency is converted into a sampling frequency at each point based on the encoding method information. 1 is provided.
[0006]
The present invention can thus eliminate the difference in audio level due to the difference in encoding method and minimize the influence of background noise. In addition, even when an encoding method having a different sampling frequency is used, the mismatch is removed, and clear voice information communication can be performed.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a first embodiment of the voice information communication system of the present invention. Here, a case where the same encoding scheme is used is shown. The present invention relates to a conventional data input unit 11A to 11N, first data storage units 12A to 12N, a speech encoder 13, a speech decoder 14, an arithmetic processing unit 15 for synthesizing speech, and a second processing unit. A multi-point voice information communication system including data storage units 16A to 16N and data output units 17A to 17N has a configuration in which a voice coding system determination circuit 18 and an amplitude adjustment circuit 19 are added. I have.
[0008]
A data input unit 11A to 11N, a first data storage unit 12A to 12N, a speech encoder 13, a speech decoder 14, an arithmetic processing unit 15 for synthesizing speech, and a second In a multipoint voice information communication system having data storage units 16A to 16N and data output units 17A to 17N, code data to be input to the data input units 11A to 11N are interpolated. A speech coding scheme determining circuit 18 for determining a decoding scheme of the speech decoder 14 based on the coding scheme information obtained, and reading out previously stored data from the first data storage units 12A to 12N each time. An amplitude adjusting circuit 19 for adjusting the amplitude of the audio signal decoded by the audio coding method selected by the audio coding method determining circuit 18; Amplitude adjustment to adjust to the amplitude suitable for the method And a road 19.
[0009]
FIG. 2 is a block diagram showing a second embodiment of the voice information communication system of the present invention. Here, a case where a different encoding method is adopted is shown. In the present invention, conventional data input units 21A to 21N, first data storage units 22A to 22N, audio encoders 23A to 23N, audio decoders 24A to 24N, and an arithmetic processing unit 25 for synthesizing audio. , A second data storage section 26A-26N, and a data output section 27A-27N, a multi-point voice information communication system, a voice coding scheme determination circuit 28A-28N, an amplitude adjustment circuit. 29A to 29N are added.
[0010]
The data input units 21A to 21N, the first data storage units 22A to 22N, the audio encoders 23A to 23N, the audio decoders 24A to 24N, and an operation for synthesizing the audio. In the voice information communication system including the processing unit 25, the second data storage units 26A to 26N, and the data output units 27A to 27N, the data input units 21A to 21N Speech coding method determination circuits 28A to 28N for determining the decoding method of the speech decoders 24A to 24N based on the coding method information inserted into the input code data, and the first data storage. The data stored in advance are read out from the units 22A to 22N each time, and the amplitude adjustment circuit 29A for adjusting the amplitude of the audio signal decoded by the audio encoding method selected by the audio encoding method determination circuits 28A to 28N. ~ 29N and the above decoding First frequency conversion circuits 210A to 210N for converting the sampling frequency of the obtained audio signal at each point according to the instructions of the audio coding system determination circuits 28A to 28N, if necessary, and an operation for synthesizing the audio. Second frequency conversion circuits 211A to 211N for converting the output voice of the processing unit into a sampling frequency suitable for the voice encoders 23A to 23N according to the instructions of the voice coding system determination circuits 28A to 28N, if necessary. And
[0011]
The different coding schemes referred to here are, for example, those described in ITU-T Recommendations. 711, G.R. 721; 722; 723.1, G.I. 726, G.R. 728, and G. 729. Also, a high-efficiency speech coding system defined by other international standards may be used. FIG. 3 shows an example of a configuration relating to voice processing in the case of voice information communication at four points, and adopts the form of the same encoding method with four inputs and four outputs. The data input sections 31a, 31b, 31c, 31d, the first data storage sections 32a, 32b, 32c, 32d, the voice encoder 33, the voice decoder 34, and voice are synthesized. It comprises an arithmetic processing section 35, second data storage sections 36a, 36b, 36c, 36d, and data output sections 37a, 37b, 37c, 37d.
[0012]
By repeating this process four times with one decoding and speech synthesis as one step, a constituent speech for each point is constructed. The synthesized speech is encoded by the speech encoder 33 and transmitted. The audio processing section is configured to minimize the use of the intermediate buffer assuming that it is configured by a digital signal processor or the like. In order to use a smaller number of memories, a configuration in which the first data storage units 32a, 32b, 32c, and 32d and the second data data storage units 36a, 36b, 36c, and 36d are shared. Is also possible.
[0013]
【The invention's effect】
As described above, according to the present invention, the following effects can be obtained.
[0014]
(1) Even if an audio signal is encoded using several different audio encoding methods, it is decoded and then synthesized in the same dynamic range, so that the influence of disturbance such as background noise is suppressed to a low level. And smooth voice information communication can be realized.
[0015]
(2) Since the synthesized speech signal can also supply a speech level that matches each encoding method, noise due to clipping or the like can be reduced, so that high-quality speech communication can be realized.
[0016]
(3) Since the memory capacity to be used can be reduced, the hardware can be reduced and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration example of a first voice information communication system according to the present invention.
FIG. 2 is a block diagram showing a configuration example of a second voice information communication system according to the present invention.
FIG. 3 is a block diagram illustrating a configuration example of a voice processing unit of the voice information communication system according to the present invention.
FIG. 4 is a block diagram illustrating a basic configuration example of a voice information communication system according to a conventional technique.
[Explanation of symbols]
Reference Signs List 10 Voice information communication system 11A-11N Data input sections 12A-12N First data storage section 13 Voice encoder 14 Voice decoder 15 Arithmetic processing sections 16A-16N for synthesizing voice data Storage units 17A to 17N Data output unit 18 Voice coding system determination circuit 19 Amplitude adjustment circuit 20 Voice information communication systems 21A to 21N Data input units 22A to 22N First data storage units 23A to 23N Voice codes Speech decoders 24A to 24N Speech decoder 25 Arithmetic processing units 26A to 26N for synthesizing speech Second data storage units 27A to 27N Data output units 28A to 28N Speech coding method determination circuits 29A to 29N Amplitude adjustment Circuits 210A to 210N First frequency conversion circuits 211A to 211N Second frequency conversion circuits 31a and 31b Data input sections 31c and 31d Data input 32a, 32b First data storage units 32c, 32d First data storage unit 33 Speech encoder 34 Speech decoder 35 Operation processing units 36a, 36b for synthesizing speech Second data storage Units 36c, 36d Second data storage units 37a, 37b Data output units 37c, 37d Data output units 40 Voice information communication systems 41A to 41N Voice information communication terminals 42 Multipoint control device 43 Voice decoder 44 Microphone 45 Speech synthesis circuit 46 Encoder

Claims (4)

A data input unit that corresponds to the voice information communication terminal on a one-to-one basis, and that inputs coded data transmitted from the voice information communication terminal by a predetermined coding method; A first data storage unit for storing each encoded data, a speech decoder for decoding each encoded data stored in the first data storage unit, and the speech decoder , An arithmetic processing unit for synthesizing and adding each output audio data from the audio processing unit, an audio encoder for encoding the output of the arithmetic processing unit, and a second storage unit for storing the encoded output data from the audio encoder And a data output unit that outputs each data from the second storage unit.
A voice coding scheme determining circuit for determining a decoding scheme based on coding scheme information inserted into the coded data input to the data input section; and a first data storage section. A first method of reading data stored in advance for each reference sampling period and adjusting the amplitude of the audio signal decoded by the decoding method selected by the audio coding method determination circuit to an amplitude based on the coding method information . voice information communication system and an amplitude adjustment circuit, and a second amplitude adjustment circuit for adjusting the output from the arithmetic processing section to the amplitude based on the coding method information, characterized in that it consists of. Wherein converting the sampling frequency of the audio signal decoded each point by the speech decoder in the same frequency, convex ku sampling in the audio signal synthesized added in the same sampling frequency the coding method information 2. The voice information communication system according to claim 1, wherein the voice information is converted into a frequency. A data storage unit that stores coded data transmitted from the voice information communication terminal by a predetermined coding method, a voice decoder that decodes each coded data stored in the data storage unit, An arithmetic processing unit that synthesizes and adds each output audio data from the audio decoder; an audio encoder that encodes the output of the arithmetic processing unit; and an output coder that outputs the encoded data from the audio encoder to the audio. And a data output unit that outputs to the information communication terminal.
A speech coding scheme determining circuit for determining a decoding scheme based on coding scheme information inserted in each piece of encoded data stored in the data storage unit; and a speech coding scheme determining circuit. A first amplitude adjustment circuit that adjusts the amplitude of the audio signal from the audio decoder decoded by the selected decoding method to an amplitude based on the encoding method information , wherein the arithmetic processing unit is configured to execute the predetermined processing. A multipoint control device, which synthesizes and adds each audio signal adjusted to the amplitude. 4. The multipoint control device according to claim 3, further comprising a second amplitude adjustment circuit that adjusts an output from the arithmetic processing unit to an amplitude based on the encoding method information .

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