Full duplex speakerphone
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 12, 1997
Grant Date -
N/A
app pub date -
Mar 10, 1995
filing date -
Mar 10, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A full duplex speakerphone for connection to a telephone system employs adaptive FIR filters for acoustic and electrical echo cancellation in a novel combination with analog gain controls responsive to incoming signal levels and a transmit level control responsive to the receive signal power level. The particular combination minimizes the amount of digital signal processing required to maintain full duplex operation by holding the signal dynamic range within predetermined limits.
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Family
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Cited Art Landscape
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