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Echo counteracting method and system in wireless communication system

A wireless communication system and echo cancellation technology, which is applied in the direction of wired transmission system, transmission system, two-way sound reinforcement telephone system, etc., can solve intermittent problems, achieve the effects of improving detection accuracy, reducing calculation amount, and reducing system burden

Inactive Publication Date: 2008-04-16
ZTE CORP
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Problems solved by technology

[0006] Chinese patent applications No. 96194651.2 and No. 96192447.0, both on the terminal side simply judge whether the downlink voice energy needs to close the current uplink input, which leads to The other party sounds intermittent

Method used

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  • Echo counteracting method and system in wireless communication system
  • Echo counteracting method and system in wireless communication system

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Embodiment Construction

[0026] The main idea of ​​the present invention is that, considering the relatively fixed delay length generated by the fixed station in wireless communication, and the echo characteristics of the dynamic delay within a certain range, using the relatively mature electrical system developed for PSTN side echo The high-efficiency and high-performance algorithm of the echo canceller can quickly and effectively eliminate the delayed echo. That is to say, for the downlink speech to be encoded, the downlink speech frame is first sent to the echo cancellation system, and the output of the uplink code packet decoded by the vocoder is directly used as the signal Sin to be processed by the echo cancellation system, Afterwards, the echo cancellation system buffers the received downlink speech frame as the reference signal Rin and the signal Sin to perform conventional echo cancellation processing, and finally obtains the error signal Sout.

[0027] The technical solutions adopted by the ...

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Abstract

The invention discloses a method and a system of echo counteraction for wireless communication system and belongs to the technology for wireless communication voice improvement. The method of the invention comprises the followings: a descending voice data is firstly sent to the echo counteraction system and then a decoded ascending voice signal is sent to the echo counteraction system; at last, the echo counteraction system buffers the descending voice data as a reference signal, the current input ascending voice signal is used as a signal to be processed, echo elimination can be conducted according to the reference signal and the signal to be processed and then the echo counteraction system outputs difference signal and sends to a switch. The invention also discloses the echo counteraction system in the wireless communication system. The invention reduces load of the system and meanwhile effectively reduces calculated amount as well as improves detection precision, and moreover, the invention can rapidly and effectively eliminate echo.

Description

technical field [0001] The invention belongs to wireless communication voice improvement technology, in particular to an echo cancellation method and system in a wireless communication system. Background technique [0002] In a mobile communication system, electrical echo usually occurs during a call between a mobile station and a fixed telephone, and the mobile station user hears his own echo. The electrical echo is mainly caused by the impedance mismatch of the hybrid converter (Hybrid) that functions as two-wire and four-wire conversion on the fixed-line side. Generally, the hybrid converter is located in the analog subscriber board (ASL) of the fixed exchange, the two-wire terminal is connected to the fixed telephone, and the four-wire terminal is generally connected to the digital transmission network. On the fixed-line side, due to the impedance mismatch of the hybrid converter (Hybrid), part of the signal from the four-wire side to the second-wire side leaks back to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04M9/08H04B3/23
Inventor 楼红伟赵霞
Owner ZTE CORP
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