JPH0981199A - Voice-band information transmitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit a distortion-free high-quality DTMF signal without transmitting a control bit specially. SOLUTION: On the transmitting side, a DTMF detector 13 judges whether every one frame is a DTMF signal or not. When it is a DTMF signal, the corresponding compressed data is selected from a DTMF coding pattern memory 14 which holds the information of one frame of various DTMF signal compressed in advance by a high-efficiency voice coder 12 to output the data to a digital circuit 16. On the receiving side, a DTMF coding pattern memory 18 identical to that on the transmission side is installed. When the compressed data inputted from the digital circuit 16 is a DTMF signal, the DTMF coding pattern detector 19 detects with which one among the DTMF coding pattern memory 18 the data is coincident and generates the DTMF signal corresponding to the coincident pattern by a DTMF generator 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice encoder / decoder for use in voice digital wire communication and wireless communication, and more particularly to transmitting a non-voice signal using a voice frequency band such as a DTMF signal. The present invention relates to a voice band information transmission device.

[0002]

In the transmission of non-voice signals such as DTMF signals through a highly efficient voice encoder / decoder,
In some cases, the signal cannot be correctly transmitted due to signal distortion caused by encoding and decoding. Therefore, in the conventional technique, as shown in FIG. 3, when the DTMF signal is input to the voice band signal input terminal 1, the DTMF detector 3 is detected separately from the high-efficiency voice encoder 2 and the switch 4 is used. Connect b terminal and d terminal,
One bit indicating whether or not it is detected and a code indicating the type of DTMF are transmitted through the digital line 5. FIG. 4 shows the data format on the digital line 5. s is a bit for determining whether or not s is a DTMF signal, and one frame is formed with the subsequent voice / DTMF data.

On the receiving side, the decision bit detector 6
Whether or not it is an F signal is detected, the b terminal and the d terminal are connected by the switch 9, and the DTMF signal generated by the DTMF generator 8 by the code indicating the type from the digital line 5 is output to the voice band signal output terminal 10. By outputting, high quality DTMF transmission without signal distortion due to encoding and decoding can be performed.

[0004]

However, in the above-mentioned conventional voice band information transmission device, it is necessary to add a decision bit for a voice signal or a non-voice signal in a frame,
There is a problem that less information can be used for voice.

The present invention solves such a conventional problem and provides a high quality D without adding a decision bit.
An object is to provide a voice band information transmission device capable of TMF transmission.

[0006]

A voice band information transmitting apparatus according to the present invention comprises, on the transmitting side, a coding means for compressing a voice signal, a means for detecting a non-voice signal, and a means for previously encoding a non-voice signal. And a means for selecting and outputting either the data obtained by compressing the voice signal or the data obtained by compressing the non-voice signal, and the receiving side is provided with the compressed voice code. Means for decompressing, a means for storing data obtained by previously compressing a non-voice signal by the encoding means, a means for detecting whether the compressed data transmitted from the transmitting side is a voice signal or a non-voice signal, and a decoding means It has a means for generating a non-voice signal without using a means, and a means for selecting and outputting either the data obtained by decoding the voice signal or the data having generated the non-voice signal.

[0007]

With the above construction, the voice band information transmitting apparatus of the present invention detects the input of a non-voice signal, transmits the information compressed by the encoding means in advance, and compresses the information in advance by the encoding means on the receiving side. It is possible to generate a non-voice signal without using decoding means by detecting that the information is the above-mentioned information.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a voice band information transmission device according to an embodiment of the present invention. In FIG. 1, 11 is a voice band signal input terminal, 12 is a high-efficiency speech encoder for compressing a speech signal, 13 is a DTMF detector for detecting a non-speech signal, and 14 is a high-efficiency speech encoder for a non-speech signal in advance. DT that saves data compressed with
The MF coding pattern memory, 15 is a switch for selecting and outputting either data obtained by compressing a voice signal or data obtained by compressing a non-voice signal, and these constitute a device on the transmission side. Reference numeral 16 is a digital line that connects the device on the transmitting side and the device on the receiving side.

In the apparatus on the receiving side, 17 is a high-efficiency speech decoder for expanding a compressed speech code, and 18 is a DT on the transmitting side for storing data obtained by previously compressing a non-speech signal.
The DTMF coding pattern memory which is the same as the MF coding pattern memory 14, and 19 detects which of the DTMF coding pattern memories 18 the compressed data transmitted from the transmission side matches when it is a non-voice signal. DTMF coded pattern detector, 20 generates a non-voice signal based on the matched pattern without using the high-efficiency voice decoder D
A TMF generator, 21 is a switch for selecting and outputting either data obtained by decoding a voice signal or data obtained by producing a non-voice signal, and 22 is a voice band signal output end.

FIG. 2 is a schematic diagram showing an example of the contents of the DTMF coding pattern memories 14 and 18 in this embodiment.
Between the address 0 and the address N, one frame of compressed data of the PB signal corresponding to each number is stored.

Next, the operation of this embodiment will be described.
In FIG. 1, the voice signal or the DTMF signal input to the voice band signal input terminal 11 on the transmission side is compressed by the high-efficiency voice encoder 12 into data of one frame (for example, 10 ms) which is compressed by an encoding algorithm. ,
It is output to the a terminal of the switch 15. Further, the DTMF detector 13 also determines whether or not each frame is a DTMF signal, and if it is a DTMF signal, outputs a code of that type to the DTMF coding pattern memory 14 and a switching signal to the switch 15 It is output to the c terminal of. The DTMF coding pattern memory 14 holds information obtained by previously compressing various DTMF signals for one frame by the high-efficiency voice encoder 12, selects compressed data corresponding to the code from the DTMF detector 13, and switches 15 Output to terminal b.

The switch 15 is a switch for a normal voice signal.
The a and d ends are connected to each other to output the voice compression data from the high efficiency voice encoder 12 to the digital line 16.
If a signal is detected, connect b end and d end, and
The compressed data from the F-coded pattern memory 14 is output to the digital line 16.

The receiving side has the same DTMF coding pattern memory 18 as the transmitting side, and when the compressed data input from the digital line 16 is a DTMF signal, the DTMF coding pattern detector 19 uses the DTMF coding pattern memory 18. The matching pattern memory 18 is detected, the code of the matched pattern is output to the DTMF generator 20, and the switching signal is output to the c terminal of the switch 21.

The DTMF generator 20 generates a DTMF signal corresponding to the code from the DTMF coding pattern detector 19. The switch 21 connects the end a and the end d for normal voice compression data, and outputs the decompressed data from the high-efficiency voice decoder 17 to the voice band signal output end 22.
If the DTMF coding pattern is detected, the end b and the end d
The ends are connected and the DTMF signal from the DTMF generator 20 is output.

[0015]

As described above, according to the present invention, the DTMF detection is performed on the transmission side by using the data pattern obtained by compressing the non-voice signal previously compressed by the voice signal compression means, for example, one frame of various DTMF signals. In that case, the receiving side is notified of the pattern, and the receiving side generates a DTMF signal based on the pattern, so that the receiving side does not have a special addition of control bits, and the receiving side does not have distortion and is a high-quality It has an effect that an audio signal can be generated.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a voice band information transmission device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing an example of contents of a DTMF encoding pattern memory in the embodiment.

FIG. 3 is a block diagram showing a configuration of a conventional voice band information transmission device.

FIG. 4 is a schematic diagram showing a transmission format in a conventional example.

[Explanation of symbols]

 11 voice band signal input terminal 12 high efficiency voice encoder 13 DTMF detector 14 DTMF coding pattern memory 15 switch 16 digital line 17 high efficiency voice decoder 18 DTMF coding pattern memory 19 DTMF coding pattern detector 20 DTMF generator 21 switch 22 voice band signal output end

Claims (2)

[Claims] 1. A transmitter, wherein encoding means for compressing a voice signal, means for detecting a non-voice signal, means for storing data obtained by previously compressing a non-voice signal by the encoding means, and a voice signal And a means for selecting and outputting either the compressed data or the data obtained by compressing the non-voice signal, the receiving side having a decoding means for expanding the compressed voice code, and the non-voice signal in advance. Means for storing data compressed by the encoding means, means for detecting which of the compressed data matches when the compressed data transmitted from the transmitting side is a non-voice signal, and decoding And a means for generating a non-voice signal based on the compressed data without using means, and a means for selecting and outputting either the data obtained by decoding the voice signal or the data produced by the non-voice signal. This And a voice band information transmission device. 2. The transmitting side and the receiving side perform compression and decompression on a frame-by-frame basis, respectively, and a means for storing data obtained by previously compressing a non-voice signal by an encoding means compresses various DTMF signals by one frame. The voice band information transmission device according to claim 1, which holds information.