Noise control circuit

Details Noise control circuit Noise control circuit

H - Electricity

04

M

379/64, 340/72

H04M 3/18 (2006.01) H04B 3/23 (2006.01)

Patent

CA 1222587

ABSTRACT OF THE DISCLOSURE Residual noise control is provided on telecommuni- cations links, which are at least partly 4-wire, by means of a variable threshold centre clipper applied to the out- put of an echo canceller. The threshold of the centre clipper is varied in accordance with the magnitude of an echo estimate generated by the echo canceller. In order to prevent mutilation of near end speech the clipper is disabled when such speech is detected. However, the echo canceller remains in circuit to allow control of echo even during doubletalk. The clipper's threshold may be con- trolled in response to the instantaneous modulus of the echo estimate. Alternatively, the echo estimate may be fed to a modulator and filter to provide a short term filtered version of the echo estimate which allows con- trol of other components of residual noise.

438989

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