Pulse or digital communications – Equalizers – Automatic
Patent
1997-05-07
1998-06-16
Chin, Stephen
Pulse or digital communications
Equalizers
Automatic
375229, 375230, 375233, 36472419, 3647242, H03H 730, H03H 740
Patent
active
057683131
ABSTRACT:
An adaptive equalizer performs adaptive signal processing on an input digital signal passing through a transfer path so as to minimize an equalization error and sends out a digital signal obtained by the adaptive signal processing. This adaptive equalizer comprises: a variable coefficient filter for performing a filtering process on the input digital signal based on a coefficient set therein; an error detection system for detecting the equalization error; and a coefficient control section for controlling the coefficient based on the equalization error. The coefficient control section includes: a discrimination circuit for discriminating if an absolute value of each sample value of the input digital signal is greater than a predetermined value; and a coefficient generating section for, when the absolute value is discriminated as greater than the predetermined value by the discrimination means, generating the coefficient based on a value obtained by giving a sign according to the sign of that sample value to the equalization error. This adaptive equalizer contributes to reducing the circuit scale while maintaining a high data transfer efficiency.
REFERENCES:
patent: 3992616 (1976-11-01), Acker
patent: 4097807 (1978-06-01), Fujimura
patent: 5321559 (1994-06-01), Nguyen et al.
Chin Stephen
Pioneer Electronic Corporation
Yu Frederick
LandOfFree
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