Circuit for eliminating echo and side tone in switch system

A sidetone and echo technology, applied in the field of switching systems, can solve the problems of reducing call quality and increasing product costs.

Inactive Publication Date: 2003-09-24
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, if echo and sidetone are not properly canceled during hands-free communication via conventional telephones, one party's voice will mix with the other's, degradi

Method used

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  • Circuit for eliminating echo and side tone in switch system
  • Circuit for eliminating echo and side tone in switch system
  • Circuit for eliminating echo and side tone in switch system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] refer to figure 2 , the switching system of the present invention includes an office line interface 210, a time division switch 220, a sidetone and echo cancellation circuit 230, and a user interface 240. The office line interface 210 is connected to the office line and the time division switch 220 . The time switch 220 switches data streams between the office line interface 210 and the user interface 240 . The sidetone and echo cancellation circuit 230 is used to cancel the sidetone and echo from the PCM data received from the time division switch 220 , and then write the sidetone and echo-eliminated PCM data into the time division switch 220 . The user interface 240 connects the time division switch 220 and users.

[0011] refer to figure 2 , which describes the communication between two telephones "A" and "B" respectively connected to the switching system through the office line interface 210 and the user interface 240, the office line interface 210 will send th...

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PUM

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Abstract

A circuit for canceling echo and sidetone in a switching system connecting first and second subscribers, comprising a first linear converter, a sidetone canceling filter, a limiter, a first PCM converter, a second linear converter, echo cancellation filter, and a second PCM converter.

Description

technical field [0001] The present invention relates to a switching system, and more particularly to a circuit for eliminating echo and sidetone by using the message mode of a time-division switch in the switching system. Background technique [0002] The echo phenomenon that occurs during hands-free telephone communication through an external speaker and microphone installed in the phone is usually caused by the far-end user's voice being fed back from the speaker to the microphone, such as figure 1 shown. In addition, the sidetone phenomenon is usually due to the impedance mismatch in the hybrid conversion circuit from two wires to four wires in traditional telephones, and the voice of one party is induced into its own speaker. Thus, if echo and sidetone are not properly canceled during hands-free communication over a traditional phone, one party's voice will mix with the other's, degrading the quality of the call. Therefore, conventional telephones should be equipped wi...

Claims

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Application Information

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IPC IPC(8): H04M1/20H04B3/20H04M3/00H04M3/40
CPCH04M3/002H04M3/40H04B3/20
Inventor 朴宰民
Owner SAMSUNG ELECTRONICS CO LTD
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