JPH09121371A - Voice encoding and decoding system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a voice encoding system with which a DTMF signal (tone signal) can be also transmitted and reproduced as data and further, the other information can be transmitted or nothing can be transmitted when there is no voice. SOLUTION: A voice encoding device 10 is provided with a voice encoder 5 respectively connected to a microphone 1, to which a sound signal is inputted, and a data terminal 2, to which a data signal is inputted, so as to output a voice encoding signal 4 while receiving an input sound signal from the microphone 1, voice presence/absence discriminator 6 or discriminating the presence/ absence of voice in the input voice signal 3 by monitoring the input sound signal 3, and data generator 9 for receiving the output of the voice presence/ absence discriminator 6 and adding the voice encoding signal 4 when there is a voice and when no voice, adding a data generator output signal 8 including a data signal 7 supplied from a data terminal to respective control bits and outputting them. Based on the information of control bits as mentioned above, either a voice decoding means for decoding the sound signal or a data decoding means for decoding the data signal is selected.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a so-called voice coding and decoding system.

[0002]

2. Description of the Related Art In the conventional voice coding and decoding system, coding is performed at a constant speed and decoding is performed regardless of the situation of the inputted voice. That is, unlike a linear speech coding method such as the so-called PCM coding method, for example, in the analysis-synthesis speech coding method, for example, 1200 to 2400 bp.
Coding and decoding are performed at a constant bit rate as low as s.

[0003]

However, in this conventional analysis-synthesis voice encoding and decoding system, for example, a tone signal obtained when each of the twelve push buttons provided on the telephone is pressed. DTMF (D
ual Tone Multi Frequency)
There was a problem that the signal did not pass.

Further, since the data is encoded at the same constant rate in the presence of voice and in the absence of voice, it means that wasteful information is transmitted, and the transmission efficiency cannot be improved, resulting in effective use of the line. There was a problem that it did not exist.

It is an object of the present invention to reduce the amount of data by transmitting the above-mentioned DTMF signal as data and recovering the sound, and by transmitting other information when there is no voice or by transmitting nothing. The purpose of this is to provide a voice coding and decoding method that can effectively use the line.

[0006]

In order to achieve the above object, in the voice coding and decoding system of the present invention, a control bit is added to a voice coded signal, and a voice signal is added based on the information of the control bit. It is characterized in that either one of the audio decoding means for decoding the data and the data decoding means for decoding the data signal is selected.

Further, according to the present invention, a voice coding means for receiving a voice input signal and outputting a voice coded signal, and monitoring the voice input signal to detect whether the voice input signal is voiced or not. Audio presence / absence determining means and data for receiving the output of the audio presence / absence determining means and outputting the voice coded signal in the presence of voice and the data signal supplied from the data input means in the absence of voice with each control bit added. The control bit of the control bit is provided with a generation unit, a control bit determination unit that determines each control bit of the output of the data generation unit, a voice decoding unit that decodes a voice signal, and a data decoding unit that decodes a data signal. A voice encoding and decoding method is obtained which is characterized in that either one of the voice decoding means and the data decoding means is selected based on information.

[0008]

In the voice coding and decoding system of the present invention,
Since a control bit is added to a voice coded signal and one of a voice decoding means for decoding a voice signal and a data decoding means for decoding a data signal is selected based on the information of the control bit, it is transmitted in a speech codec. What cannot be transmitted can be transmitted as data.

Further, it is possible to transmit other information or no information at the time of no voice.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a voice coding and decoding system according to an embodiment of the present invention will be described in detail with reference to the drawings.

That is, in the voice encoding and decoding system of this embodiment, as shown in FIGS. 1 and 2, a microphone 1 as a voice input means for inputting a voice signal and a data signal such as a keyboard or a fax are input. A voice encoder 5 connected to each of the data terminals 2 as data input means and receiving a voice input signal 3 from the microphone 1 and outputting a voice encoded signal 4; A voice presence / absence determiner 6 for determining the presence or absence of voice of the input signal 3 and an output of the voice presence / absence determiner 6 supplies a voice coded signal 4 in the presence of voice to the data terminal 2 in the absence of voice. A voice encoding device 10 having a data generator 9 for outputting a data generator output signal 8 including a data signal 7 with each control bit added, and a voice output means for outputting a voice signal. And a control bit determiner 23 that is connected to the data terminal 22 as data output means for outputting a data signal and determines each control bit of the data generator output signal 8 described above, and decodes a voice signal. And a voice decoding device 20 including a voice decoder 24 for performing the voice decoding by the voice decoder 24 based on the information of the control bits.
Is supplied to the data terminal 22 or the data signal 7 is supplied to the data terminal 22.

The speech coding apparatus 10 has two input terminals 11 and 12 and one output terminal 13 as shown in FIG.
have. That is, as shown in FIG. 1, the audio encoding device 10 includes an audio input terminal 11 connected to the microphone 1, a data input terminal 12 connected to the data terminal 2, and an output terminal 1.
Three. A voice encoder 5 and a voice presence / absence determiner 6 are connected to the voice input terminal 11. The outputs of the voice encoder 5 and the voice presence / absence determiner 6 are connected to the data generator 9. A data generator 9 is connected to the data input terminal 12. The output side of the data generator 9 is connected to the output terminal 13.

The speech decoding apparatus 20 has one input terminal 26 and two output terminals 27, 2 as shown in FIG.
Have eight. That is, as shown in FIG. 2, the audio decoding device 20 is connected to the input terminal 26 and the speaker 21 which are connected to the output terminal 13 described above through a communication line or the like and the data generator output signal 8 described above is input. Audio output terminal 27
And a data output terminal 28 connected to the data terminal 22. A data selector 29 is connected to the input terminal 26, and the data selector 29 uses the speech decoder 24 based on each control bit determination result of the control bit determiner 23 that monitors the data generator output signal 8. It is selected whether the voice-decoded signal 25 is supplied to the speaker 21 or the data signal 7 is supplied to the data terminal 22.

Now, the speech coding apparatus 10 and the speech decoding apparatus 2 used in the speech coding and decoding method of the above embodiment.
The operation of 0 will be described with reference to FIG. 3 in addition to FIGS.

In the audio encoding device 10, the audio input signal 3 (see FIG. 1) input from the microphone 1 is as shown in FIG.
As shown in (a), it is assumed that the presence of voice and the absence of voice are alternately repeated. The voice presence / absence determiner 6 monitors the voice input signal 3 and outputs a voice presence / absence determination signal 30 indicating 1 when there is voice and 0 when there is no voice, as shown in FIG. 3B. 30 is input to the data generator 9, as shown in FIG. The data generator 9
As shown in FIG. 3 (c), it operates at a timing that coincides with the synchronization signal of the voice encoder 5, and the input gate of the data generator 9 has a voice presence / absence determination signal 3 as shown in FIG. 3 (d).
Based on the information of 0, the input is switched to the voice encoder when voice is present and to the data input when voice is not present. As a result, the data generator 9 changes its mode between the voice mode and the data mode in accordance with the information of the voice presence / absence determination signal 30, as shown in FIG. 4 is output, and when there is no voice, the data signal 7 is output. The signal output from the data generator 9 is as shown in FIG.
As shown in (f), it corresponds to one frame unit of the speech coded signal output from the speech encoder 5, and the head bit of each frame is the speech coded signal 4 or the data signal 7.
It is a control bit for distinguishing between the two. That is, 1
The head bit of the audio information of the frame is the control bit of (1), and the head bit of the data information of one frame is the control bit of (0).

On the other hand, in the speech decoding apparatus 20, the control bit determiner 23 monitors each control bit of the above-mentioned data generator output signal 8 inputted from the input terminal 26, and the control bit is (1). Speech decoder 24 if available
The sound is reproduced from the speaker 21 through, and if it is (0), it is output to the data output terminal 28.

An example of application of the voice coding and decoding system configured as described above to data input will be described.

For example, in the case of the above-mentioned DTMF signal transmission, twelve DTMF signals (tone signals) corresponding to twelve push buttons provided on the telephone are made to correspond to data and transmitted in the data mode.

Further, in the case of facsimile transmission, facsimile data is simultaneously transmitted during a voice call using a microphone and a speaker by utilizing a time when there is no voice input signal from the microphone.

Furthermore, if there is nothing else to be transmitted, nothing is transmitted when there is no voice. When (0) is output from the voice presence / absence determiner 6, it may be considered to stop the transmission. By transmitting nothing, the amount of data can be reduced and the line can be effectively used.

[0021]

As described above, in the voice encoding and decoding system of the present invention, voice decoding is performed by adding a control bit to a voice encoded signal and decoding the voice signal based on the information of the control bit. One of the means and the data decoding means for decoding the data signal is selected.

Therefore, it is possible to transmit in the data mode, what cannot be transmitted by the speech codec.

Further, when there is no voice, it is possible to effectively use the line by transmitting other information or reducing the amount of data by not transmitting anything.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a speech coding apparatus used in a speech coding and decoding system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a speech decoding apparatus used in a speech coding and decoding system according to an embodiment of the present invention.

3 is a timing chart showing a signal sequence in the speech encoding apparatus shown in FIG.

[Explanation of symbols]

 1 Microphone 2 Data terminal 3 Voice input signal 4 Voice coded signal 5 Voice coder 6 Voice presence / absence determiner 7 Data signal 8 Data generator output signal 9 Data generator 10 Voice coding device 11 Voice input terminal 12 Data input terminal 13 output terminal 20 speech decoding device 21 speaker 22 data terminal 23 control bit determiner 24 speech decoder 25 speech decoded signal 26 input terminal 27 speech output terminal 28 data output terminal 29 data selector 30 speech presence / absence determination signal

Claims (5)

[Claims] 1. A control bit is added to a voice coded signal,
A voice encoding and decoding method, characterized in that either one of a voice decoding means for decoding a voice signal and a data decoding means for decoding a data signal is selected based on the information of the control bit. 2. A voice coding means for receiving a voice input signal and outputting a voice coded signal, and a voice presence / absence determining means for monitoring the voice input signal and determining whether the voice input signal is voiced or not. And a data generation means for receiving the judgment result of the sound presence / absence judgment means and outputting the coded speech signal when there is sound and adding the control bit to the data signal supplied from the data input means when there is no sound, and The control bit determining means for determining each of the control bits of the output of the data generating means, the voice decoding means for decoding the voice signal, and the data decoding means for decoding the data signal are provided, and the control bit determining means determines the control bit based on the information of the control bit. A voice encoding and decoding method, characterized in that either one of the voice decoding means and the data decoding means is selected. 3. A voice which is connected to each of a voice input means for inputting a voice signal and a data input means for inputting a data signal and which receives a voice input signal from the voice input means and outputs a voice encoded signal. An encoder, a voice presence / absence determiner that monitors the voice input signal and determines whether the voice input signal is voiced or not, and receives the output of the voice presence / absence determiner to encode the voice when voice is present. When the signal is not voiced, a voice encoding device including a data generator that outputs a data generator output signal including the data signal supplied from the data input means with each control bit added, and a voice signal is output. A control bit judging device which is connected to each of the audio output device and the data outputting device for outputting a data signal and judges each control bit of the data generator output signal; And a voice decoding device provided with a voice decoder for decoding a voice signal, the signal being voice-decoded by the voice decoder based on the information of the control bit, being supplied to the voice output means or the data signal. Is selected to be supplied to the data output means. 4. The voice coding and decoding system according to claim 3, which is connected to a voice input means for inputting a voice signal and a data input means for inputting a data signal, respectively, and from the voice input means. A voice encoder that receives a voice input signal and outputs a voice encoded signal; a voice presence / absence determiner that monitors the voice input signal and determines whether the voice input signal is voiced or not; And a data generator which receives the output of the presence / absence determiner and outputs the encoded voice signal in the presence of voice and the data signal supplied from the data input means in the absence of voice with each control bit added. Audio coding device. 5. The voice encoding and decoding system according to claim 3, wherein the voice generator outputs the voice signal and the data output unit outputs the data signal. A speech decoding apparatus comprising: a control bit discriminator that discriminates each control bit of an output; and a speech decoder that decodes the speech signal.