Adaptive automatic equalizer

Details Adaptive automatic equalizer Adaptive automatic equalizer

H - Electricity

04

B

333/26

H04B 3/06 (2006.01) H03H 21/00 (2006.01) H04L 25/03 (2006.01)

Patent

CA 1257914

ABSTRACT OF THE DISCLOSURE In an adaptive automatic equalizer of the type comprising a plurality of signal memory devices for delaying an input signal at a plurality of stages, a plurality of coefficient memory devices corresponding to respective signal memory devices for storing weighting coefficients applied to the input signal to respective delay stages, accumulated product sum calculating circuit in which the input signal stored in respective memory devices is multiplied by the weighting coefficients stored in the coefficient memory devices at respective delay stages, and respective products thus obtained are accu- mulated for producing an accumulated signal as a signal corrected with a distortion of the input signal, a cal- culating circuit for calculating a corrective value for the weighing coefficients at respective delay stages stored in the coefficient memory devices based on a difference signal between the output signal of the accu- mulated sum calculating circuit and a desired signal, correcting device for correcting the weighting coeffi- cients in accordance with a value calculated by the calculating circuit, a detector for detecting a rapid change of the input signal, there is provided an inhibit- ing circuit inhibiting a substantial correction of the weighting coefficients effected by the correcting device when the rapid change is detected by the detector during an interval between the rapid change and return of the input signal to a steady state. With this adapter, it is possible to maintain the equalizing characteristic of the stable state even when the input signal changes rapidly.

521845

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