JP3602934B2 - Voice information communication system - 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 for controlling them.
[0002]
[Prior art]
FIG. 4 is a basic configuration diagram showing an example of a conventional multipoint voice information communication system. Generally, the multipoint multipoint voice information communication system 40 including the multipoint control device 42 to which a plurality of voice information communication terminals 41A to 41N are connected, has the voice information communication terminals 41A to 41N in the multipoint control device 42, respectively. Are 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 encoded 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 voice decoder 43 in the multipoint control device 42. Are added by the voice synthesis circuit 45. This synthesized speech is encoded by the speech encoder 46, and then transmitted to each of the speech information communication terminals 41A to 41N. The voice data reconstructed by the decoder 43 is subjected to a determination process in all voice terminals at every operation clock to determine whether or not the data is voice in a voice detection circuit 47, and state information is obtained. Is used in the multipoint control device 42.
[0003]
[Problems to be solved by the invention]
However, in the above-mentioned conventional multipoint voice information communication system, it is necessary to determine the presence or absence of voice for all voice information communication terminals connected for each operation clock. The amount of data was enormous, the hardware of the multipoint control device became large, and the cost associated therewith was increased. The present invention has been made in view of the above points, and provides a small-sized, low-cost multipoint voice information communication system that eliminates the above-mentioned problems, ensures the quality of speech voice, and eliminates the above problems.
[0004]
[Means for Solving the Problems]
The present invention has been made to solve these problems, and has a data input unit, a first data storage unit, a voice decoder, an arithmetic processing unit, and a data input unit corresponding to a voice information communication terminal on a one-to-one basis. A voice encoder; a second data storage unit and a data output unit; and the coded data input from the voice information communication terminal is stored in the first data storage unit. The encoded data is decoded by the audio decoder, the decoded data is arithmetically added by the arithmetic processing unit, and the arithmetically added decoded data is encoded, and the audio information output by the data output unit. In a communication system, a nonlinear audio signal conversion circuit for suppressing noise components mixed in an output from the audio decoder, and an audio signal converted by the nonlinear audio signal conversion circuit A correlation calculation circuit that calculates an autocorrelation function at a time after a certain delay, a moving average calculation circuit that calculates a time-series linear moving average of the autocorrelation function, and an evaluation signal smoothed by the moving average calculation circuit. A level detection circuit that performs a magnitude determination based on the stored level threshold, a determination circuit that determines the presence or absence of audio using an observation window configured from a plurality of slot buffers, based on a detection result of the level detection circuit; A voice information communication system comprising: a line loss insertion circuit that determines whether to operate based on the presence or absence of voice by the determination circuit.
[0005]
Since the present invention is configured as described above, it is possible to reduce the amount of calculation related to voice detection while improving the voice detection capability, and to reduce the hardware constituting the voice processing. Therefore, low-cost and small-sized multipoint voice information communication can be realized without deteriorating voice quality.
[0006]
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 basic configuration of a first voice information communication system of the present invention. The present invention includes 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 data unit. A conventional multi-point voice information communication system comprising data storage sections 16A to 16N and data output sections 17A to 17N has nonlinear voice signal conversion circuits 18A to 18N and correlation calculation circuits 19A to 19N. , Moving average calculation circuits 110A to 110N, level detection circuits 111A to 111N, and speech detection calculation processing units 113A to 113N each including a determination circuit 112A to 112N including an observation window. Data input units 11A to 11N, which correspond to the voice information communication terminals on a one-to-one basis and receive coded data transmitted from the voice information communication terminals by a predetermined coding method; The first data storage sections 12A to 12N corresponding to the input sections 11A to 11N for storing the encoded data and the first data storage sections 12A to 12N are stored. The audio decoder 14 for decoding each coded data, the arithmetic processing unit 15 for synthesizing and adding each output audio data from the audio decoder 14, and encoding the output of the arithmetic processing unit 15 Coder 13 to be converted, second data storage units 16A to 16N for storing coded data output from the voice coder 13, and second data storage unit 16A. Information communication unit composed of data output units 17A to 17N for outputting respective data from In the stem 10, nonlinear audio signal conversion circuits 18A to 18N for suppressing noise components mixed in the output from the audio decoder, and a constant audio signal converted by the nonlinear audio signal conversion circuits 18A to 18N. Correlation calculating circuits 19A to 19N for calculating the delayed autocorrelation function, moving average calculating circuits 110A to 110N for calculating a time series linear moving average of the autocorrelation function, and moving average calculating circuits 110A to 110N. The level detection circuits 111A to 111N which determine the magnitude of the evaluation signal smoothed by the above according to the level threshold value stored in advance, and the detection result of the level detection circuit using an observation window composed of a plurality of slot buffers. This is a voice information communication system characterized by using determination circuits 113A to 113N for determining the presence or absence of voice.
[0007]
The information obtained by the voice detecting means is sent to the host computer as one of the evaluation values of the terminal control and the state control, and is processed. FIG. 2 is a block diagram showing a basic configuration of the second voice information communication system of the present invention. The present invention includes a data input unit 21A to 21N, a first data storage unit 22A to 22N, a speech encoder 23, a speech decoder 24, an arithmetic processing unit 25 for synthesizing speech, and a second data unit. A conventional multipoint voice information communication system comprising data storage sections 26A to 26N and data output sections 27A to 27N has nonlinear voice signal conversion circuits 28A to 28N and correlation calculation circuits 29A to 29N. , A voice detection operation processing section 213A-213N comprising a moving average calculation circuit 210A-210N, a level detection circuit 211A-211N, and a determination circuit 212A-212N including an observation window, and a line loss insertion circuit 214A-214N. The configuration is as follows. Data input units 21A to 21N which correspond to the voice information communication terminals on a one-to-one basis and receive coded data transmitted from the voice information communication terminals by a predetermined coding method; Corresponding to the input units 21A to 21N, the first data storage units 22A to 22N for storing the encoded data and the first data storage units 22A to 22N are stored. An audio decoder 24 for decoding each encoded data, an arithmetic processing unit 25 for synthesizing and adding each output audio data from the audio decoder 24, and an output of the arithmetic processing unit 25 Speech encoder 23 to be converted, second data storage units 26A to 26N for storing output encoded data from the speech encoder 23, and second data storage unit 26A. Information communication unit comprising data output units 27A to 27N for outputting respective data from In the stem 20, non-linear audio signal conversion circuits 28A to 28N for suppressing noise components mixed in the output from the audio decoder, and a constant audio signal converted by the non-linear audio signal conversion circuits 28A to 28N. Correlation calculation circuits 29 to 29N for calculating the delayed autocorrelation function, moving average calculation circuits 210A to 210N for calculating a time-series linear moving average of the autocorrelation function, and moving average calculation circuits 210A to 210N Level detection circuits 211A to 211N that determine the magnitude of the evaluation signal smoothed by the above in accordance with a level threshold value stored in advance, and the detection results of the level detection circuits 212A to 212N are obtained by using an observation window composed of a plurality of slot buffers. The line loss insertion circuit 2 is based on the determination results of the determination circuits 212A to 212N that determine the presence or absence of voice using It is a voice information communication system, wherein to determine whether to operate the 4A～214N.
[0008]
FIG. 3 is a diagram showing an observation window composed of a plurality of slot buffers common to the first and second voice information communication systems of the present invention. In the case of the first invention, in each slot buffer, the result determined by the level detection circuit 111A is stored in the form of "0" or "1". For example, two "1" s out of ten buffers are stored. Is present, the voice is present in that section, and if all are "0", there is a criterion that there is no voice, and voice detection is performed. Although this criterion depends on the time series length represented by one buffer, it may be selected and determined in advance by simulation or the like. Of course, the old information in the buffer is discarded in accordance with the operation clock, and each buffer is shifted to store the latest information. With this configuration, the long-term time-series information is compressed into a small buffer memory and stored as evaluation bits. As described above, the determination circuit has a very simple configuration, and can be realized by a very simple algorithm when configured with a digital signal processor or the like.
[0009]
【The invention's effect】
As described above, according to the present invention, the following effects are expected.
[0010]
(1) According to the first aspect of the present invention, the number of product-sum operations related to voice detection is greatly reduced, so that performance requirements for a hard device such as a DSP are eased, thereby reducing costs.
[0011]
(2) According to the second aspect of the present invention, since the voice information communication terminal other than the voice information communication terminal having the voice is suppressed, the synthesized background noise does not degrade the voice quality of the call, so that clear and high quality voice information communication is performed. System can be provided.
[0012]
(3) Since the sensitivity of voice detection can be controlled only by controlling the number of slots in the slot buffer, it can be applied to many system configurations while ensuring stability.
[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 diagram used for explaining 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 systems 11A to 11N Data input sections 12A to 12N First data storage section 13 Voice coder 14 Voice decoder 15 Arithmetic processing sections 16A to 16N for synthesizing voice data Storage units 17A to 17N Data output units 18A to 18N Non-linear audio signal conversion circuits 19A to 19N Correlation calculation circuits 110A to 110N Moving average calculation circuits 111A to 111N Level detection circuits 112A to 112N Judgment circuits 113A to 113N Audio detection calculation processing units Reference Signs List 20 audio information communication systems 21A-21N data input sections 22A-22N first data storage sections 23A-23N audio encoders 24A-24N audio decoder 25 arithmetic processing sections 26A-26N for synthesizing audio 2 data storage units 27A to 27N data output units 28A to 28N 29A to 29N Correlation calculation circuits 210A to 210N Moving average calculation circuits 211A to 211N Level detection circuits 212A to 212N Judgment circuits 213A to 213N Voice detection operation processing units 214A to 214N Line loss insertion circuit 30 Slot buffer 40 Multipoint multipoint voice information communication Systems 41A to 41N Voice information communication terminal 42 Multipoint control device 43 Voice decoder 44 Microphone 45 Voice synthesis circuit 46 Voice encoder 47 Voice detection circuit

Claims (1)

A data input unit, a first data storage unit, a speech decoder, an arithmetic processing unit, a speech encoder, a second data storage unit, and a data output corresponding to the speech information communication terminal on a one-to-one basis; And storing the encoded data input from the audio information communication terminal in the first data storage unit, and decoding the stored encoded data by the audio decoder. In the audio information communication system in which the decoded data is arithmetically added by the arithmetic processing unit, and the arithmetically added decoded data is encoded and output by the data output unit, the decoded data is mixed with the output from the audio decoder. A non-linear audio signal conversion circuit for suppressing a noise component which is present, and a phase for calculating an autocorrelation function of the audio signal converted by the non-linear audio signal conversion circuit and delayed by a certain amount. A calculating circuit, a moving average calculating circuit for calculating a time-series linear moving average of the autocorrelation function, and a magnitude judgment based on a level threshold value stored in advance by the evaluation signal smoothed by the moving average calculating circuit. A level detection circuit that performs the detection, a determination circuit that determines the presence or absence of a sound using an observation window formed of a plurality of slot buffers based on the detection result of the level detection circuit, and whether the determination circuit operates based on the presence or absence of the sound. And a line loss insertion circuit for determining the sound information.

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