Acoustic echo cancellation (AEC) rate adaptation
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United States of America Patent
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Nov 19, 2019
Grant Date -
Mar 7, 2019
app pub date -
Sep 1, 2017
filing date -
Sep 1, 2017
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Abstract
Step size can be used to slow or freeze the adaptive filter to improve AEC system performance, such as during double talk events. An AEC control system may be used to adjust the step size based on an echo-to-disturbance energy ratio (EDER). The algorithm adjusts the step size to lower the adaptation rate when the EDER is small (or the combination of the near signal and noise is large compared to the echo) and raise the adaptation rate when the EDER is large (echo is large compared to a combination of near signal and noise).
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