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A DSP BASED LONG DISTANCE ECHO
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2010-07-05
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ABSTRACT
This paper describes an implementation of a long distance
echo canceller which copes with double talking situations
and exceeds the CCITT G.165 recommendation. The
proposed solution is based on short length adaptive filters
centered on the positions of the most significant echoes,
which are tracked by time-delay estimators. To deal with
double talking situations a speech detector is employed.
The resulting algorithm enables long-distance echo
cancellation with low computational requirements. It
reaches greater echo return loss enhancement and shows
faster convergence speed as compared with results reported
in recent literature.
This paper describes an implementation of a long distance
echo canceller which copes with double talking situations
and exceeds the CCITT G.165 recommendation. The
proposed solution is based on short length adaptive filters
centered on the positions of the most significant echoes,
which are tracked by time-delay estimators. To deal with
double talking situations a speech detector is employed.
The resulting algorithm enables long-distance echo
cancellation with low computational requirements. It
reaches greater echo return loss enhancement and shows
faster convergence speed as compared with results reported
in recent literature.
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