Double-Talk detector for echo canceller

Details Double-Talk detector for echo canceller Double-Talk detector for echo canceller

1995-09-29

1997-05-20

Safourek, Benedict V.

Multiplex communications

Duplex

Transmit/receive interaction control

379407, 379411, 370290, H04B 323

Patent

active

056319002

ABSTRACT:
A double-talk detector for an echo canceller includes power estimators (60) and (62) which are utilized to measure the ERLE value in a calculator (64). This ERLE value is stored in a register (70) when it is the largest value generated. This register (70) is updated whenever a new and better ERLE occurs. A fraction of the value in register (70) is utilized as an input to a comparator (88), and then compared to the current ERLE value. If the current ERLE differs from the SERLE in register (70) an inhibit signal is generated for blocking the updates of an adaptive filter (40). The value stored in the register (70) is periodically decremented to reduce the value thereof. This decrement operation is performed in response to detection of an utterance from the far-end.

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