Communications interface for duplex transmission and reception o

Details Communications interface for duplex transmission and reception o Communications interface for duplex transmission and reception o

1983-07-18

1986-11-04

Orsino, Jr., Joseph A.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

370 27, 370 321, 379410, H04B 320, H04B 324, H04J 1500, H04L 514

Patent

active

046213562

ABSTRACT:
A communication system for simultaneous (full duplex) transmission and reception over a communications link, such as a telephone line, utilizes a duplexer to derive the received signal and decorrelates the received and transmitted signals with the aid of a correlation cancellation loop thereby reducing the effect of the transmitted signal on the received signal without the need for frequency selective filters thereby making efficient use of the available telephone line band width, increasing the available rate of transmission and reception of the signals and reducing the need for equalized (conditioned) telephone lines for high-speed transmission and reception. A variable gain (AGC) amplifier which provides a substantially constant amplitude output may be used in the correlation cancellation loop to amplify the received signals for correlation with the transmitted signals so as to enhance operation with received signals derived at low amplitude from the line. A portion of the transmitted signal may be also injected into the loop to enhance the decorrelation effect.

REFERENCES:
patent: 3632905 (1972-01-01), Thomas et al.
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patent: 4246582 (1981-01-01), Kondo et al.
patent: 4320498 (1982-03-01), Justice
patent: 4349889 (1982-09-01), Van den Elzen
patent: 4362909 (1982-12-01), Snijders et al.
patent: 4370741 (1983-01-01), Haass
patent: 4423505 (1983-12-01), Grieg
patent: 4480327 (1984-10-01), Vance
patent: 4481622 (1984-11-01), Cheng et al.
Demyto et al.-"Echo Cancellation"-Proceedings of IEEE-vol. 65, No. 3, Mar. 1977, pp. 444-453.

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