Method and arrangement of echo elimination in digital telecommunications system
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United States of America Patent
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-
May 17, 1994
Grant Date -
N/A
app pub date -
Jun 15, 1992
filing date -
Jun 13, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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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