Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of hybrid or echo suppressor or canceller
Patent
1996-05-21
1998-08-04
Saras, Steven
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Of hybrid or echo suppressor or canceller
379406, 379407, 379410, H04M 124, H04M 100
Patent
active
057906327
ABSTRACT:
An improved method and apparatus for canceling echo is disclosed. The echo canceller of the present invention compensates for the existence of quantization error in the echo signal that does not exist in the reference signal by introducing the quantization effects into the reference signal. The quantization effects are typically companding quantization errors caused by the A-law and .mu.-law quantizers prevalent in digital communications equipment.
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Antonio Franklin P.
DeJaco Andrew P.
Sih Gilbert C.
Golden Linli L.
Miller Russell B.
Qualcom Incorporated
Saras Steven
Shankar Vijay
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