Band-by-band full duplex communication

Details Band-by-band full duplex communication Band-by-band full duplex communication

2005-11-08

2005-11-08

Harold, Jefferey F. (Department: 2644)

Telephonic communications

Echo cancellation or suppression

Disable or inhibit function

C379S406030, C379S406010

Reexamination Certificate

active

06963642

ABSTRACT:
A telephone includes a first channel having a microphone input and a line output, a second channel having a line input and a speaker output, and each channel having a plurality of band pass filters with their outputs coupled to a multiplex circuit. The multiplex circuit selects subsets of the signals in each channel in accordance with the magnitudes of the signals in each band. Thus, full duplex operation is provided in accordance with the spectral content of each channel. In one embodiment of the invention, the multiplex circuits initially allocate alternate bands within each channel and complementary bands between the channels, thereby emulating a complementary comb filter. Thereafter, bands are allocated according to spectral content.

REFERENCES:
patent: RE28919 (1976-07-01), Berkley et al.
patent: 4748663 (1988-05-01), Phillips et al.
patent: 4991167 (1991-02-01), Petri et al.
patent: 5271057 (1993-12-01), Addeo et al.
patent: 5561668 (1996-10-01), Genter
patent: 5668794 (1997-09-01), McCaslin et al.
patent: 6798881 (2004-09-01), Thomasson
Encyclopedia of Electronic Circuits, Rudolf F. Graf, vol. 3, pp. 391-397, © 1991 McGraw-Hill, Inc.

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