Echo cancelling system

Details Echo cancelling system Echo cancelling system

1985-05-22

1988-05-31

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379406, H04B 322

Patent

active

047486660

ABSTRACT:
An echo cancelling system incorporated in a conventional echo canceller with additional circuitry to provide tracking and compensation for drifting of any D.C. offset generated.
Upon initial energization of the system (i.e. before data signals are processed thereby) an output signal e.sub.1k from an error signal input device represents a D.C. offset value generated by the components of the system.
This value is stored in a D.C. offset register, the loading of which is controlled by a load/inhibit signal. Refining of the stored value during data processing is achieved using predetermined increments .DELTA..sub.1 for half-duplex mode and .DELTA..sub.2 (of smaller size) for full-duplex mode.

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patent: 4300231 (1981-11-01), Moffitt
patent: 4303895 (1981-12-01), Ohnishi et al.
patent: 4347615 (1982-08-01), Ash
patent: 4363938 (1982-12-01), Daaboul et al.
patent: 4609788 (1986-09-01), Miller et al.

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