Method of and apparatus for eliminating the side tone of a telep

Details Method of and apparatus for eliminating the side tone of a telep Method of and apparatus for eliminating the side tone of a telep

1976-06-09

1978-03-28

Claffy, Kathleen H.

1791702, H04M 158

Patent

active

040816168

ABSTRACT:
Method and apparatus for use in telephone exchanges, such as time division multiplex exchanges, for eliminating the side tone of a telephone station by interruption of a restored input signal to a hybrid circuit thereof. A sampled signal is provided to a storage means having an output signal. The storage means output signal is filtered for reconstruction prior to connection to a reception line on the four-wire side of a hybrid circuit. The restored signal is interrupted during moments wherein a transmission signal, output on the four-wire side of the hybrid circuit, is sampled.

REFERENCES:
patent: 3287499 (1966-11-01), Brightman
patent: 3319005 (1967-05-01), Gaunt
patent: 3828146 (1974-08-01), Lewis

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