Echo canceller based on proportional overall adaptive method
An echo cancellation and self-adaptive technology, applied in instruments, two-way sound reinforcement telephone systems, speech analysis, etc., can solve problems such as poor convergence performance, slow convergence speed, and insufficient use of the sparse characteristics of the echo path, so as to speed up the convergence speed , the effect of reducing the impact
Pending Publication Date: 2022-04-29
SUZHOU UNIV
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Problems solved by technology
Traditional echo cancellers based on least mean square and normalized least mean square methods are easy to implement, but have poor convergence performance when both the input speech and the echo are disturbed by noise
In response to this situation, echo cancellers based on overall adaptive methods have been proposed in the literature, but these echo cancellers do not take full advantage of the sparse nature of the echo path, so the convergence speed is slow
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[0022] The present invention proposes an echo canceller based on a proportional overall adaptive method. The structural principle of the echo canceller is as follows: figure 1 shown. The echo canceller has better performance and faster convergence when both input and output signals are interfered by noise.
[0023] This embodiment uses a computer experiment method to verify the performance of the PTNLMS echo canceller. In the experiment, the PTNLMS echo canceller disclosed by the present invention is used to cancel the echo under the environment of white noise interference at the input and output, and its performance is based on GD-TLS [Analysis of the Gradient-Descent Total Least-Squares Adaptive Filtering Algorithm ,2014,62(5):1256-1264] and RZA-TLS[Reweighted l 1 Regularized TLS linear neuron for the sparse system identification,2016,173,1972–1975]The performance of the echo canceller is compared. The echo cancellation performed by the PTNLMS echo canceller disclosed in ...
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The invention discloses an echo canceller based on a proportional overall adaptive method, and belongs to the field of acoustic signal processing. The echo canceller is established by a total mean square error cost function constrained by a minimization condition. By introducing a proportion matrix, the echo canceller accelerates convergence by using the sparsity of the system. The overall cost function enables the echo canceller to still obtain low steady-state maladjustment under the condition that input and output signals are interfered by noise, so that the precision is high. The echo canceller disclosed by the invention can be applied to communication systems such as video conferences, hands-free telephones and the like.
Description
technical field [0001] The invention discloses an echo canceller based on a proportional overall self-adaptive method, which belongs to the field of acoustic signal processing. Background technique [0002] In communication systems such as video conferencing and hands-free telephones, in order to reduce echo and improve call effect, an echo canceller is required. An echo canceller generates an approximation of the echo by estimating the impulse response of the echo path, and then reduces the echo by subtracting the echo signal from the constructed echo approximation. [0003] The impulse response of the echo path is often sparse, that is, most elements of the impulse response are close to zero, and a few elements have large values. Traditional echo cancellers based on least mean square and normalized least mean square methods are easy to implement, but have poor convergence performance when both the input speech and the echo are disturbed by noise. In response to this situ...
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Login to View More IPC IPC(8): G10L21/0208H04M9/08
CPCG10L21/0208H04M9/082G10L2021/02082
Inventor 倪锦根邢祎炜
Owner SUZHOU UNIV