Line echo canceller scalable to multiple voice channels/ports
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United States of America Patent
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N/A
Issued Date -
Aug 1, 2002
app pub date -
Jan 30, 2001
filing date -
Jan 30, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention relates to a system and method for canceling echoes from telecommunications networks by providing a system on chip having a line echo canceller and tone detector. Unlike conventional echo cancellers, the present invention uses a chip to cancel echoes that are generated in the network. In addition, the echo canceller of the present invention performs line echo cancellation, far end echo cancellation, acoustic and hybrid echo cancellation, noise processing, fax/data tone detection, DTMF, and digital timing. The present invention uses multiplexed analog delay lines, analog multipliers and adders/subtractors to perform and accelerate echo canceling, thereby enhancing channel density and optimizing scalable design of the chip and avoiding expensive chip with large on-chip logic and memory that is typically required in digital echo cancellers.
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