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Echo cancellation method and device

A technology of echo cancellation and sampling time, which is applied in the field of signal processing, can solve problems such as weak adaptability to different signals, reduced filter coefficient amplitude, and limited echo cancellation effect, so as to solve the contradiction between filter accuracy and amplitude and improve adaptability Ability to avoid large effect of echo residue

Active Publication Date: 2012-01-11
NEW H3C TECH CO LTD
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Problems solved by technology

If the accuracy is increased, the fractional part needs to occupy more register bits, which will lead to a decrease in the magnitude of the filter coefficients. Similarly, if the range is increased, the integer part needs to occupy more register bits, which will result in filtering decrease in accuracy
In the existing algorithm, a balance is taken between precision and amplitude based on experience, and the precision value and amplitude value of the filter coefficient are fixed, which obviously has weak adaptability to different signals and limits the effect of echo cancellation.

Method used

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Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] The main method provided by the present invention can be as figure 2 As shown, it mainly includes the following steps:

[0020] Step 201: Determine the far-end signal strength P at the current sampling moment k f [k] and near-end signal strength P n [k].

[0021] Wherein, the signal strength involved in this step may be represented by a signal amplitude, or may be represented by a signal power.

[0022] Step 202: According to P f [k] and P n The ratio between [k], set the filter coefficients of the adaptive filter.

[0023] Step 203: Perform echo cancellation processing on the near-end signal at the current sampling time k according to the coefficients of the adaptive filter processed in step 202.

[0024] In the existing LMS algori...

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Abstract

The invention provides an echo cancellation method and an echo cancellation device. The method comprises the following steps of: determining far-end signal intensity Pf[k] and near-end signal intensity Pn[k] at a current sampling moment k; B, setting a filter coefficient of an adaptive filter according to the rate of Pf[k] to Pn[k]; and C, performing echo cancellation processing on a near-end signal at the current sampling moment k according to the adaptive filter coefficient processed by the step B. By the method and the device, the adaptability of echo cancellation to different signals can be enhanced, and echo cancellation effects can be bettered.

Description

technical field [0001] The present invention relates to the technical field of signal processing, in particular to an echo cancellation method and device. Background technique [0002] In voice communication systems, echoes are often generated due to the coupling of speakers and microphones. For the user of the voice communication system, the signal from the remote user received through the loudspeaker is a far-end signal, and the far-end signal is played at the near-end through the loudspeaker. At the same time, the near-end microphone acquires the voice of the near-end user to generate a near-end signal, and sends the near-end signal to the far-end user through the link of the voice communication system. However, when the speaker plays the far-end signal, part of the sound of the far-end signal will be picked up by the near-end microphone and mixed with the near-end signal, causing the near-end signal to have an echo. If the echo is not eliminated, the echo will be trans...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04M9/08
Inventor 朱旭东毕永建
Owner NEW H3C TECH CO LTD
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