Digital echo canceller

Details Digital echo canceller Digital echo canceller

1984-02-22

1985-10-22

Rubinson, Gene Z.

1791708, H04B 320

Patent

active

045490481

ABSTRACT:
An echo canceller is used to cancel an echo signal occurring in the receive path of a data transmission modem in response to the signal appearing in the transmit path. This echo canceller comprises a controllable digital filter connected to the transmit path and adjusted by means of a control circuit, a difference circuit producing a residual signal resulting from the difference between the signal in the receive path and the synthetic echo signal supplied by the filter and an analog-to-digital converter which converts the residual signal into a digital control signal for the control circuit. In order to have the echo canceller function in a homochronous transmission system with an analog-to-digital converter having a reduced number of bits, the converter is controllable and is adjusted by the output signal of an attenuation circuit connected to the output of a circuit which detects the peak value of the residual signal.

REFERENCES:
patent: 3836734 (1974-09-01), Campanella et al.
patent: 4064484 (1977-12-01), Mese et al.
patent: 4113997 (1978-09-01), Horna
patent: 4268727 (1981-05-01), Agrawal et al.
patent: 4334128 (1982-06-01), Snijders
patent: 4362909 (1982-12-01), Snijders et al.

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