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Adaptive filter divergence control in echo cancelers by means of amplitude distribution evaluation with configurable hysteresis
Adaptive filter divergence control in echo cancelers by means of amplitude distribution evaluation with configurable hysteresis
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机译:通过可配置滞后的幅度分布评估,在回声消除器中进行自适应滤波器发散控制
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摘要
A configurable adaptive filter (50) that is used for echo cancellation is disclosed, which includes a method of detecting a voice or no-voice signal. The presence of a voice or no-voice signal is determined by calculating a histogram of signal amplitude value over a period of time. If this histogram has more than a predefined number of samples that are above a threshold then the signal is classified as no-voice or periodic otherwise the signal is classified as a voice signal. A variable maximum amplitude limit and lower amplitude thresholds are disclosed to detect a voice or no-voice from the histogram signal faster than traditional methods utilized in echo cancelers. A configurable hysteresis time is used to ensure the signal register primarily contains voice signal when the filter coefficients of the echo canceler are allowed to adapt.
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