Circuit arrangement for echo suppression

Details Circuit arrangement for echo suppression Circuit arrangement for echo suppression

1994-08-18

1996-06-04

Hofsass, Jeffery

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379410, 379411, 379406, 379407, 36472418, 36472419, H04M 908

Patent

active

055241492

ABSTRACT:
In an adaptive filter a frequency domain filter is used to enhance the convergence properties of the filter for strongly correlated signals.
To reduce the amount of delay in the filter the impulse response of said filter for small values of time is generated by a time domain filter, and said impulse response for larger values of time is generated by a frequency domain filter.

REFERENCES:
patent: 4903247 (1990-02-01), Van Gerwen et al.
patent: 5278900 (1994-01-01), Van Gerwen et al.
"General Characteristics Of International Telephone Connections And International Telephone Circuits" CCITT Recommendation G. 167 (Mar. 1993).
"Multidelay Bkock Frequency Domain Adaptive Filter" Jia Sien Soo et al, IEEE Transactions On Acoustics, Speech, And Signal Processing, vol. 38, No. 2, Feb. 1990.

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