JPH0583207A - Voice data transmission system - Google Patents

Abstract

PURPOSE:To transfer data in a voice message with high sound quality. CONSTITUTION:A transmission terminal equipment 11 commands the setting to the mode to receive 64kbps voice data of high quality voice message to a reception terminal equipment 12. The reception terminal equipment 12 reaches the state able to receive data of the voice message subject to A/D conversion by a sampling frequency in 24kHz according to the commanded mode. The transmission terminal equipment 11 confirming it sets a 24kHz sampling frequency to an A/D converter section 22 to store the voice message to a transmission memory 23 and the transmission terminal equipment 11 starts data transfer in 64kbps to the reception terminal equipment 12. The reception terminal equipment 12 stores the received voice data to a reception memory 27. When the transfer of the voice data is finished, the transmission terminal equipment 11 interrupts the connected light. The reproduction of the voice in the high sound quality mode is implemented by selecting the 24kHz sampling frequency and by using the D/A converter section 29 through the operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice data transmission system, and more particularly to a voice data transmission system for transmitting a voice signal or a voice message through a digital line.

[0002]

2. Description of the Related Art In the conventional voice data transmission system, a voice message has a frequency of 8 KHz in the same manner as a voice signal which requires immediacy.
It was sampled at and sent directly to a digital line (ISDN) with a transmission rate of 64 kbps.

[0003]

In the above-mentioned conventional audio data transmission system, since the audio data sampled at 8 bits and 8 KHz is directly sent on the transmission line having a transmission speed of 64 kbps, only 300 Hz to 3400 Hz can be reproduced. There wasn't.

[0004]

According to the audio data transmission system of the present invention, an operation section for outputting a mode signal indicating a voice signal or a voice message to be transmitted by operation designation, and the voice signal at a first sampling frequency. A first A / D conversion unit for A / D converting and outputting as first data, and A / D conversion of the voice message at a second sampling frequency higher than the first sampling frequency to obtain second data. A second A / D converter that outputs, a transmission memory that stores and outputs the first or second data, and outputs the mode signal and the first or second data to a connected digital line. A transmission side communication control section; a reception side communication control section which outputs a reception mode signal and reception first or second data from the digital line; And a first and a second D / A conversion unit for converting the data from the reception memory according to the mode signal and outputting it as a reception voice signal or a reception voice message. .

[0005]

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.

The transmission terminal 11 sends a mode signal m indicating a voice signal a or a voice message c to be transmitted according to an operation designation.
Is output, a first A / D converter 21 for A / D converting the voice signal a at a sampling frequency of 8 KHz and outputting the first data, and a voice message c at a sampling frequency of 24 KHz. A second A / D converter 22 for A / D converting and outputting as second data;
Alternatively, the transmission memory 23 that stores and outputs the second data
And a communication control unit 24 for outputting the mode signal m and the first or second data to the connected digital line ISDN.

The receiving terminal 12 is a digital line ISDN.
From the communication control unit 26 for outputting the reception mode signal m and the reception first or second data, the reception memory 27 for storing and outputting the reception first or second data, and the reception mode signal m. The first and second D / A converters 28 and 29 for converting the data from the reception memory 27 and outputting the received voice signal b or the received voice message d in accordance with
Have and.

Next, the operation of this embodiment will be described. The transmitting terminal 11 instructs the receiving terminal 12 to set a mode for receiving the voice data of 64 kbps of a high-quality voice message, and the receiving terminal 12 receives the instruction and sets it to 24 kHz.
The voice message data at the sampling frequency of can be received. After confirming this, the transmitting terminal 11 sets the sampling frequency of 24 KHz in the A / D converter 22 to store the voice message in the transmitting memory 23, and then starts data transfer to the receiving terminal 12 at 64 kbps. The receiving terminal 12 stores the received voice data in the receiving memory 27. When the transfer of the voice data is completed, the transmitting terminal 11 disconnects the connection line. Receiving terminal 1
In response to this, 2 records that the voice message in the high quality mode is received, and shifts to the voice signal receiving mode. Playback of audio in the high-quality mode on the receiving terminal 12
The sampling frequency of 24 KHz is selected by human operation.

[0009]

As described above, according to the present invention, voice data A / D converted at a high sampling frequency is stored in the memory on the transmitting side, the voice data is transferred at the normal speed, and the voice data is received on the receiving side. By storing the voice data in the memory, it is possible to transfer a voice message with high sound quality.

[Brief description of drawings]

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

[Explanation of symbols]

 11 Sending Terminal 12 Receiving Terminal 21 First A / D Converter 22 Second A / D Converter 23 Sending Memory 24, 26 Communication Control 25 Control Section 27 Receive Memory 28 First D / A Converting 29 29th 2 D / A converter

Claims (1)

[Claims] 1. An operation unit for outputting a voice signal or a mode signal indicating a voice message to be transmitted by operation designation, and an A / D for the voice signal at a first sampling frequency.
A first A / D conversion unit for converting and outputting as first data; and a first A / D conversion unit for A / D converting the voice message at a second sampling frequency higher than the first sampling frequency and outputting it as second data. 2 A / D converters, a transmission memory that stores and outputs the first or second data, and a transmission side that outputs the mode signal and the first or second data to a connected digital line. A communication control unit, a reception-side communication control unit that outputs a reception mode signal and reception first or second data from the digital line, and stores and outputs the reception first or second data. A reception memory; and first and second D / A conversion units for converting data from the reception memory according to the mode signal and outputting as a reception voice signal or a reception voice message. Voice data transmission method according to claim.