Echo cancellor and centre clipper control arrangement

Details Echo cancellor and centre clipper control arrangement Echo cancellor and centre clipper control arrangement

H - Electricity

04

M

379/64

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

Patent

CA 1232987

PHF 84531 35 25.4.1985 ABSTRACT: Echo canceller and centre clipper control arrangement. This arrangement is intended to control the operation of the coefficients adjusting circuit (12) of an echo canceller and of the operation of a centre clip- per (15) inserted in the send path (7) of a four-wire circuit at the output of the subtractor (13) of the echo canceller for suppressing there, when it is set to its active state, the signals whose amplitude is lower than or equal to a clipping threshold. The control arrange- ment operates on the basis of the signal in the receive path (2) of the four-wire circuit, the level NREC of this signal and the levels NAV and NAP of the signals before and after the subtractor (13). It comprises means (21) for comparing the level NAV to two fixed thresholds NAVO, NAV1 and for comparing the ratio NAP/NAV to a threshold a which is capable of varying as a function of NAV, the centre clipper being only set to its active state when the level NAV is comprised between NAVO and NAV1 a d e ratio NAP/NAV is below a threshold a, the clipping threshold varying in accordance with an increas- ing function of the level NAV.

480932

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