Full duplex speakerphone for radio and landline telephones

Details Full duplex speakerphone for radio and landline telephones Full duplex speakerphone for radio and landline telephones

H - Electricity

04

M

325/17, 379/81

H04M 1/60 (2006.01) H04B 3/23 (2006.01) H04M 9/08 (2006.01)

Patent

CA 1234235

FULL DUPLEX SPEAKERPHONE FOR RADIO AND LANDLINE TELEPHONES 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 generated via an A/D converter (601) and an adaptive filter (301) is subtracted by a summer (303) from the transmit signal generated by the speakerphone microphone (115). Adaptive filter receive signal representation coefficients employed in the receive signal adaptive filter (301) are modified when the receive signal is detected in a land party signal detector (225). Likewise, to cancel electronic echo of the transmit signal, a representation of the transmit signal generated via an A/D converter (605) and an adaptive filter (305) is subtracted from the receive signal by summer (307). The adaptive filter transmit signal representation coefficients employed in the transmit signal adaptive filter (305) are modified when the transmit signal is detected.

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