Adaptive echo canceller using differential pulse code modulation

Details Adaptive echo canceller using differential pulse code modulation Adaptive echo canceller using differential pulse code modulation

1975-10-31

1977-05-17

Safourek, Benedict V.

H04B 320

Patent

active

040243583

ABSTRACT:
An echo canceller having a digital transversal filter with an adaptive control loop for achieving minimum echo is disclosed. Minimum echo is attained by subtracting a synthesized echo from the real echo, the synthesized echo being formed in a digital transversal filter by multiplying a stored replica of the impulse response times the incoming signal. The stored replica is updated using the steepest descent technique by adjusting each of the stages of the replica memory a given amount. The incoming signal is differential pulse code modulation encoded to reduce the process complexity and the size of the memories which store the replica and the incoming signals or, alternatively, increase the performance of the canceller.

REFERENCES:
patent: 3784747 (1974-01-01), Berkely et al.
patent: 3922505 (1975-11-01), Hoge
patent: 3937907 (1976-02-01), Campanella et al.

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