Full duplex modem having two echo cancellers for a near end echo

Details Full duplex modem having two echo cancellers for a near end echo Full duplex modem having two echo cancellers for a near end echo

1987-09-14

1990-06-19

Ng, Jin F.

Multiplex communications

Wide area network

Packet switching

379410, H04B 323

Patent

active

049359193

ABSTRACT:
An echo canceller in a modem cancels echoes from hybrid transformers on both the near end and the far end. The echo canceller has a variable delay which may be adjusted to conform to a round trip of an echo. An adaptive filter has a number of delay circuits, each adding an increment of delay. A number of these delay circuits are selected in order to provide a selected delay time.

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patent: 3860768 (1975-01-01), Wehrmann
patent: 4577309 (1986-03-01), Barazeche et al.
patent: 4582963 (1986-04-01), Danstrom
patent: 4587382 (1986-05-01), Yang
patent: 4593161 (1986-06-01), Desblache et al.
patent: 4742510 (1988-05-01), Quatieri, Jr. et al.
patent: 4751730 (1988-06-01), Galand et al.
patent: 4805215 (1989-02-01), Miller

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