Full duplex speakerphone for radio and landline telephones
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United States of America Patent
Stats
-
Dec 16, 1986
Grant Date -
N/A
app pub date -
Dec 14, 1984
filing date -
Dec 14, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A full duplex speakerphone employing adaptive filters and having application in radiotelephone systems is disclosed. To cancel acoustic feedback echo of the receive signal, a representation of the receive signal is subtracted from the transmit signal generated by the speakerphone microphone. The adaptive filter receive signal representation coefficents are modified when the receive signal is detected. Likewise, to cancel electronic echo of the transmit signal, a representation of the transmit signal is subtracted from the receive signal. The adaptive filter transmit signal representation coefficients are modified when the transmit signal is detected.
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Family
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Cited Art Landscape
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