Echo suppressor

Details Echo suppressor Echo suppressor

1987-08-10

1989-09-05

Ng, Jin F.

Telephonic communications

Echo cancellation or suppression

370321, H04B 320

Patent

active

048646083

ABSTRACT:
An echo suppressor for a communication system wherein a signal sent to a transmitting line is returned to a receiving line with some delay. The suppressor comprises an attenuator for attenuating the amplitude of a received speech signal. The transmitting speech signal amplitude level is compared to the amplitude of a receiving speech signal, and according to the result obtained, a signal for controlling the signal attenuation of the attenuator is generated. The delay time, until the attenuation control signal operates on the attenuator according to a change in the amplitude level of the receiving speech signal, is controlled. The controlled delay time is normally held at a predetermined maximum value, and is minimized when a change in amplitude of the receiving speech signal indicates a beginning of speech. Thus, an echo of the speech uttered by a near end user can be suppressed without impairing a beginning of the speech signal uttered by a far end user.

REFERENCES:
patent: 3896273 (1975-07-01), Fariello
patent: 4029912 (1977-06-01), Geigel et al.
patent: 4123626 (1978-10-01), Munter

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