Method and arrangement of echo elimination in digital telecommun

Details Method and arrangement of echo elimination in digital telecommun Method and arrangement of echo elimination in digital telecommun

1992-06-15

1994-05-17

Chin, Stephen

Pulse or digital communications

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375102, 370 321, 379410, H04B 110

Patent

active

053134982

ABSTRACT:
In order to reduce the complexity of an adaptive digital filter used to cancel delayed network echoes, a delay circuit is arranged in series therewith and arranged to compensate for the delay inherent with a speech codec. In the case of a variable delay circuit, the degree by which the echo is delayed is detected in the adaptive digital filter and used to modify the delay time. A gain control arrangement can be provided and used to reduce the gain of the received signal when the near-end party is talking and the adaptive capacity of the adaptive digital filter is exceeded.

REFERENCES:
patent: 4554417 (1985-11-01), Boyer
patent: 4796296 (1989-01-01), Amada et al.
patent: 4835765 (1989-05-01), Bergmans et al.
patent: 4864608 (1989-09-01), Miyamoto et al.
patent: 4935919 (1990-06-01), Hiraguchi
patent: 5163044 (1992-11-01), Golden
D. Duttweiler, Subsampling to Estimate Delay with Application to Echo Cancelling, IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-31, No. 5, Oct. 1983, pp. 1090-1099.
P. Yip and D. Etter, an Adaptive Technique for Multiple Echo Cancelation in Telephone Networks, Dept. of Electrical/Computer Engineering, Univ. of New Mexico, 1987, pp. 2133-2136.
S. Ikeda and A. Sugiyama, An Adaptive Tap Placement Algorithm for an Adaptive FIR Filter and Its Application to An Echo Canceler, Spr. Gen. Assem. of Jap. Elec. Inform. Telecom, Assoc., 1990.

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