Echo cancellation method, system and device

A technology of echo cancellation and coefficient, applied in the field of signal processing, can solve the problems of deterioration of echo cancellation performance, reduction of echo cancellation, false detection of double-ended sound, etc., so as to improve the effect of echo cancellation and slow down the update.

Inactive Publication Date: 2011-09-14
NEW H3C TECH CO LTD
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Problems solved by technology

However, it is often difficult to meet this condition in the actual application of echo cancellation. In this way, there will be the following problems: when the dialogue starts, the probability of double talk is higher than that during the conversation. If the adaptive filter is still During the convergence process, use the above-mentioned energy comparison method or correlation calculation method to perform double-talk detection and control the adaptive filter to stop iterations, which will lead to a vicious cycle of echo cancellation performance deterioration and detection errors
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  • Echo cancellation method, system and device
  • Echo cancellation method, system and device

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Embodiment Construction

[0049] 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.

[0050] The echo canceling method provided by the present invention does not need to separately detect the double-end sound, so that the problems caused by double-end sound detection are better avoided, and the effect of echo cancellation is improved.

[0051] see figure 1 , figure 1 The flowchart provided for the embodiment of the present invention. Such as figure 1 As shown, the process may include the following steps:

[0052] Step 101, divide the input time-domain signal into M sub-signals.

[0053] In this step 101, the sub-signal is a sub-band signal, or a frequency-domain signal.

[0054] In this step 101, M is a positive integer greater than 1. Among them, in engineering use, if the sub-signal is a sub-band signal, M generally takes a...

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Abstract

The invention provides an echo cancellation method, system and device. The method comprises the followings steps: A, dividing input time-domain signals into M sub-signals, wherein the sub-signals are subband signals or frequency-domain signals, and M is an frequency domain which is more than 1; and B, for each sub-signal, using far-end signal energy and error signal energy of the sub-signal at the existing sampling time and filtering parameters at the previous sampling time to set filtering parameters of an adaptive filter at the existing sampling time; and then carrying out the echo cancellation on the sub-signal at the existing sampling time in accordance with the set filtering parameters. According to the invention, the effects of the echo cancellation can be improved.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to an echo cancellation method, system and device. Background technique [0002] In voice communication systems, echoes are often generated due to the coupling of speakers and microphones. In order to improve the performance of voice communication system, echo cancellation has become an important topic in the field of voice communication. However, in voice communication systems, the double talk problem becomes the bottleneck of echo cancellation. [0003] The so-called double-end sounding specifically refers to: in the context of hands-free two-way conversation, both ends speak at the same time, which is equivalent to inputting noise into the adaptive filter, which affects the normal update of the adaptive filter and causes the adaptive filter to fail. If the filter coefficient of the device diverges, the opposite end can hear its own echo, and the call experience is not...

Claims

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Application Information

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IPC IPC(8): H04M9/08
Inventor 封伶刚
Owner NEW H3C TECH CO LTD
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