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Trans mitter-receiver

A technology of sending, receiving and sending calls, which is applied in the direction of telephone communication, side tone elimination circuit, electrical components, etc., and can solve the problems of lowering of the sending signal level and ineffective side tone control function, etc.

Inactive Publication Date: 2005-06-15
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there is a problem that the sidetone control function cannot work effectively because the level of the speaking signal of the talker is also lowered

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0043] figure 1 It is a block diagram for explaining the brief configuration of the telephone receiver with sidetone circuit according to the first embodiment of the present invention. This transmitting and receiving device includes a transmitting microphone 1 that collects the voice of the user (speaker) to generate a transmitting signal, and an A / D that converts the transmitting signal generated by the transmitting microphone 1 from an analog signal to a digital signal. A converter 2, a voice encoder 3 for encoding and compressing the speech signal converted into a digital signal by the A / D converter 2, and a transmission processing circuit for performing signal processing for transmission on the coded signal compressed by the voice encoder 3 4. Use the output terminal 5 for transmitting the transmission signal generated by the transmission processing circuit 4 through the telephone line or antenna, etc., suppress the background noise contained in the transmission signal co...

no. 2 example

[0055] figure 2 Shown is a brief structural block diagram of the telephone sending and receiving device according to the second embodiment of the present invention. The sending and receiving phone device of the present embodiment and figure 1 Compared with the speaking device of the first embodiment shown, the only difference is that the side tone level controller controls the level of the side tone according to the level of the speaking signal and the level of the receiving signal. Therefore, detailed descriptions of redundant configurations and functions will not be repeated. In addition, the reference numerals of the sidetone circuit and the sidetone level controller of this embodiment are described with 7b and 9' respectively.

[0056] The side tone circuit 7b includes a noise suppressor 8 that suppresses the background noise contained in the speech signal that is converted into a digital signal output by the A / D converter 2; 1. A side tone level controller 9 ′ for co...

no. 3 example

[0061] image 3 Shown is a brief structural block diagram of the telephone sending and receiving device according to the third embodiment of the present invention. The sending and receiving phone device of the embodiment and figure 1 Compared with the telephone receiver of the first embodiment shown, the only difference is that the noise suppressor 8 included in the sidetone circuit 7a is connected between the A / D converter 2 and the voice coder 3. Therefore, detailed descriptions of redundant configurations and functions will not be repeated. In addition, the reference numeral of the sidetone circuit in this embodiment is described with 7c.

[0062] The voice encoder 3 compresses and encodes the speech signal whose background noise has been suppressed by the noise suppressor 8 , and outputs it to the transmission processing circuit 4 .

[0063] The sidetone circuit 7c includes a sidetone level controller 9 that controls the level of the speech signal after background nois...

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PUM

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Abstract

A noise suppressor suppresses noise includes in the transmitted sound converted into digital signal by an A / D converter. A sidetone level controller controls the level of the transmitted signal after the noise is suppressed by the noise suppressor and outputs the transmitted signal as the sidetone. A D / A converter converts the received signal after the sidetone is added thereto from the digital signal to the analog signal. Thus, the sidetone level is prevented from being changed by the level of the noise present behind a talker, and the sidetone can be controlled so that the talker can make talking with an appropriate sound volume.

Description

technical field [0001] The present invention relates to a handset such as a mobile phone having a function of controlling side tone, and more particularly to a handset which suppresses the noise level and controls the side tone. Background technique [0002] In recent years, telephone receivers such as mobile phones have been widely used. As one of the main functions constituting such a telephone receiver, there is a function of controlling the side tone level. [0003] Figure 7 Shown is a schematic block diagram of a conventional receiver and receiver with a sidetone control function. This transmitting and receiving device includes a transmitting microphone 101 that collects the voice of the user (speaker) to generate a transmitting signal, and an A / D that converts the transmitting signal generated by the transmitting microphone 101 from an analog signal to a digital signal. (Analog / Digital) converter 102, voice coder 103 for coding and compressing the transmission signa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04M1/00H04M1/58H04M1/74
CPCH04M1/58H04M1/74
Inventor 池田卓史
Owner MITSUBISHI ELECTRIC CORP
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