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CLOCK SKEW COMPENSATION FOR ACOUSTIC ECHO CANCELLERS USING INAUDIBLE TONES
CLOCK SKEW COMPENSATION FOR ACOUSTIC ECHO CANCELLERS USING INAUDIBLE TONES
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机译:使用听不清音调的回音消除器的时钟偏斜补偿
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摘要
Methods and apparatus are provided for acoustic echo cancellation in a speech signal. Acoustic echo is cancelled by inserting at least one tone in the speech signal, wherein the at least one tone is substantially inaudible to a listener; determining a clock skew between two sampling clocks based on a frequency shift of the at least one tone; re-sampling the speech signal based on the determined clock skew; and performing the acoustic echo cancellation using the re-sampled speech signal. The provided acoustic echo cancellers can be implemented, for example, as terminal-based and/or network-based acoustic echo cancellers. The tone optionally comprises an inaudible tone or multiple tones. The tone generation can be limited to only when a speech power in the vicinity of the tone frequency is larger than a pre-determined threshold, or to the beginning of a call. A level of the tone can optionally be controlled so that the tone is masked by the speech signal.
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