1977-11-18
1979-03-13
Cooper, William C.
H04B 322
Patent
active
041444175
ABSTRACT:
An echo cancelling system, in which a pseudo-echo is provided by producing an impulse response of an echo path, reversed in phase and then applied to a subtractor of the echo path to cancel an echo. A low level reference signal, such as random noise or an artificial random signal, is continuously applied to the echo path and successively delayed by a sampling period to obtain a plurality of delayed reference signals, which are multplied by the output of the subtactor to obtain a plurality of multiplied outputs. The multiplied outputs are integrated by integrators and then amplified by high gain amplifiers to be employed for producing the psuedo-echo. As a result of such construction of the adaptive control loop, the convergence time for cancellation is effectively improved.
REFERENCES:
patent: RE28919 (1976-07-01), Berkley et al.
patent: 3499999 (1970-03-01), Sondhi
patent: 3500000 (1970-03-01), Kelly, Jr. et al.
patent: 3588385 (1971-06-01), Moye
patent: 3699271 (1972-10-01), Berkley et al.
Oshima Shintaro
Sato Akira
Adams Bruce L.
Burns Robert E.
Cooper William C.
Kokusai Denshin Denwa Kabushiki Kaisha
Lobato Emmanuel J.
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