Echo canceller with extended frequency range

Details Echo canceller with extended frequency range Echo canceller with extended frequency range

1984-05-21

1986-09-02

Rubinson, Gene Z.

H04B 320

Patent

active

046097872

ABSTRACT:
An echo canceller with extended frequency range for acoustic echoes comprising an adaptive finite impulse response filter receiving the receive signal below a cross-over frequency and predicting the echo of this signal across the echo path, a subtractor for subtracting the predicted echo form the send signal below the cross-over frequency, and an adder for combining the low frequency output of the adder with the send signal above the cross-over frequency to form the send signal to be transmitted.

REFERENCES:
patent: 3754105 (1973-08-01), Poschenrieder et al.
patent: 3894200 (1985-07-01), Campanella et al.
patent: 3900708 (1975-08-01), Bendel
patent: 3941948 (1976-03-01), Brooks
patent: 3946170 (1976-03-01), Brooks
patent: 4005277 (1977-01-01), Araseki et al.
patent: 4360712 (1982-11-01), Horna
COMSAT Technical Review "Cancellation of Acoustic Feedback", vol. 12, No. 2, pp. 319-333, 1982, O. Horna.
COMSAT Technical Review "Analysis of an Adaptive Impulse Response Echo Canceller, vol. 2, No. 1, pp. 1-38, Campanella, Suyderhead & Orufry.
COMSAT Technical Review "Echo Canceller with Adaptive Transversal Filter Utilizing Pseudo-Logarithmic Coding", vol. 7, No. 2, pp. 393-428, 1977, O. A. Horna.

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