Echo cancelling device capable of coping with deterioration of a

Details Echo cancelling device capable of coping with deterioration of a Echo cancelling device capable of coping with deterioration of a

1996-01-24

1997-04-15

Hsu, Alpus H.

Multiplex communications

Wide area network

Packet switching

379410, H04B 323

Patent

active

056217242

ABSTRACT:
In an echo cancelling device including adaptive echo cancellers for cancelling an echo signal to a microphone amplifier and an echo signal to a receiver amplifier, respectively, there is provided a neural network controller responsive to cancelling errors at every taps in each of the cancellers for searching, with reference to a tap producing a maximum error and to the maximum error, a library containing past echo signal patterns to find an optimum echo signal pattern as a searched pattern, changing weighting factors for the taps in each of the cancellers in accordance with the searched pattern, modifying the searched pattern to eliminate the error when the error becomes small, finely adjusting the weighting factors for the taps, and registering the modified pattern in the library.

REFERENCES:
patent: 4645883 (1987-02-01), Horna et al.
patent: 4760596 (1988-07-01), Agrawal et al.
patent: 4805215 (1989-02-01), Miller
patent: 5042026 (1991-08-01), Koike et al.
patent: 5329472 (1994-07-01), Sugiyama
patent: 5396517 (1995-03-01), Yedid et al.

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