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Method and device for echo cancellation

An echo cancellation and echo signal technology, applied in the field of signal processing, can solve the problems of slow convergence speed of echo cancellation algorithm, unable to converge, poor echo cancellation effect, etc., and achieve the effect of avoiding non-convergence, improving convergence speed and improving effect.

Active Publication Date: 2011-07-06
NEW H3C TECH CO LTD
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Problems solved by technology

However, in this method of the prior art, if the strength of the far-end signal x[k] is too large, the convergence speed of the echo cancellation algorithm will be very slow, or even unable to converge, resulting in poor echo cancellation effect

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  • Method and device for echo cancellation
  • Method and device for echo cancellation

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Embodiment Construction

[0021] 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.

[0022] Considering the impact of the input signal strength on the echo cancellation, in the present invention, the far-end signal strength is introduced into the echo cancellation algorithm, together with the echo residual error e[k] as the transfer function for adjusting the analog echo signal parameters. The main methods provided by the present invention are as figure 2 As shown, the following steps may be included:

[0023] Step 201: Determine the signal strength information of the remote signal x[k] at the last sampling time k.

[0024] Determining the intensity information of x[k] may be determining the power value of x[k], or determining the energy value of x[k].

[0025] Taking the power value of x[k] as an example here, the power valu...

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Abstract

The invention provides a method and a device for echo cancellation, wherein a signal strength value of a distal end signal is used as one of parameters for adjusting a simulation echo signal transfer function; nonlinear factors are led in when the signal strength of the distal end signal exceeds the strength threshold of an abnormal signal, so that the convergence speed of the echo simulation algorithm is increased, and the problem that non-convergence is possible to be caused by too high signal strength of the distal end signal is avoided; in addition, the adaptive capacity of the method forecho cancellation on the environment is improved, so that the effect of echo cancellation can be improved.

Description

technical field [0001] The invention relates to a signal processing technology, 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 transmitted to the far-...

Claims

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Application Information

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IPC IPC(8): H04M9/08
Inventor 封伶刚朱旭东黄建强
Owner NEW H3C TECH CO LTD
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