Receiver for a data transmission modem, comprising an echo cance

Details Receiver for a data transmission modem, comprising an echo cance Receiver for a data transmission modem, comprising an echo cance

1983-10-17

1985-07-23

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

1791702, 370 32, H04B 1502

Patent

active

045312206

ABSTRACT:
A receiver used in a data transmission modem having a receive path containing a baseband signal and clock signal, and a transmit path. An echo canceller is employed having a transversal filter connected to the transmit path for generating a synthetic echo signal. A self-adaptive equalizer includes a transversal filter connected to receive a data signal from the receive path. Subtracting means subtract the signals from the echo canceller and equalizer from the baseband signal in the receive path. The subtracting means output is sampled at a sampling rate which satisfies the Shannon criteria with respect to a transmit signal in the transmit path. The filter coefficients are controlled in response to the sampled signal. The second and third clocking signals for the echo canceller and transversal filter and self-adaptive equalizer transversal filter are derived from recovered clock signals. Circuit means are connected to the sampling circuit output for deriving first and second error signals for controlling the coefficients of the transversal filters of the echo canceller and self-adaptive equalizer.

REFERENCES:
patent: Re31253 (1983-05-01), Weinstein
patent: 4144417 (1979-03-01), Oshim et al.
patent: 4320517 (1982-03-01), Godard et al.
patent: 4355406 (1982-10-01), Guidoux
patent: 4404600 (1983-09-01), Murakami
patent: 4422175 (1983-12-01), Bingham et al.

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