| 摘要 |
In order to reduce the complexity of an adaptive digital filter used to cancel delayed network echoes, a delay circuit is arranged in series therewith and arranged to compensate for the delay inherent with a speech codec. In the case of a variable delay circuit, the degree by which the echo is delayed is detected in the adaptive digital filter and used to modify the delay time. A gain control arrangement can be provided and used to reduce the gain of the received signal when the near-end party is talking and the adaptive capacity of the adaptive digital filter is exceeded.
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