Method for realizing echo time delay positioning

An echo and delay output technology, applied in two-way sound reinforcement telephone systems, voice analysis, instruments, etc., can solve the problems of increased adaptive filter coefficients, resource occupation, and increased calculations, so as to promote the scope of application and reduce Resource occupancy rate and the effect of reducing the amount of calculation

Inactive Publication Date: 2007-08-29
ZTE CORP
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method and device for implementing echo delay positioning, which solves the problem that in the prior art, when the echo delay is long, the coefficients of the adaptive filter increase, and the amount of calculation will increase by geometric square times. Resource-occupied technical issues

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  • Method for realizing echo time delay positioning
  • Method for realizing echo time delay positioning
  • Method for realizing echo time delay positioning

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[0048] The purpose, technical solutions and advantages of the present invention will be described in further detail below with reference to the accompanying drawings.

[0049] The invention provides a fast and flexible echo delay positioning method to find the effective part of the echo, reduce the calculation amount of the adaptive filter, accelerate the convergence speed, improve the efficiency, and save the cost of the system. Any long echo delay estimation method provided by the present invention comprises the following steps:

[0050] 1) Perform low-pass filtering on the input signals of the far-end Rin and the near-end Sin respectively;

[0051] 2) Voice activation judgment on the remote Rin voice signal;

[0052] 3) respectively performing down-sampling processing on the input signals of the current far-end Rin and the near-end Sin;

[0053] 4) based on the cross-correlation calculation of the far-end Rin and the near-end Sin input signals after the downsampling proce...

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Abstract

Characters of the method are that carrying out lowpass filtering and lowering sample process for input signals from far end and near end of communication system; carrying out cross correlation calculation for lowering sample processed input signals; obtaining two maximal cross correlation values and relevant positions so as to reduce amount of calculation for estimating echo time delay. Comparing with prior art, the invention possesses advantages: reducing amount of calculation greatly; coefficient of adaptive filter does not need increment as echo time delay lengthens when being applied to echo canceller; ensuring to estimate echo time delay accurately under condition of lowered occupancy rate of resources and cost; flexible configuring parameter to extend length of time delay so as to promote application range of echo canceller.

Description

technical field [0001] The invention relates to a mobile communication base station system in the field of communication, in particular to a method for implementing echolocation under longer echo delay based on voice services. Background technique [0002] In the current mobile communication base station system, for the call between the mobile station and the fixed phone, the basic processing capability of the echo cancellation due to the 4 / 2 line conversion on the fixed phone side is within the echo delay range of 64ms. As the communication system becomes more and more complex, from traditional circuit data switching to IP soft switching, the echo delay will become longer and longer, and the minimum requirement is to have a processing capacity of 128ms. In the traditional method, increasing the length of the buffer to allow the echo cancellation algorithm to automatically realize the delay location and echo cancellation in the process of convergence is not an ideal choice. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04M9/08G10L21/02H04B3/23G10L21/0264
Inventor 楼红伟赵霞董志峰辛勤
Owner ZTE CORP
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