Digital automatic line equalizer with means for controlling tap

Details Digital automatic line equalizer with means for controlling tap Digital automatic line equalizer with means for controlling tap

1988-07-21

1989-10-03

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

3647242, H04B 304

Patent

active

048721840

ABSTRACT:
A digital automatic line equalizer for compensating distortion of a digital signal transmitted through a transmission line comprises a transversal filter having a set of tap gains for producing an equalized signal as a filter output from the digital signal incoming thereto. A first multiplier squares a current one of the filter output to produce a squared signal and other multipliers multiply the current and the previous ones of the filter outputs to produce product signals. In a calculator, the product signals are weighted and are, thereafter, summed together with the squared signal to produce summed signals which are averaged for a predetermined time duration into a mean value. A controller has a plurality of sets of values for the set of tap gains, compares the mean value with a reference value to produce an error signal and determines one set of the plurality of sets of values in response to the error signal to make the set of tap gains equal to the set of values thereby to maintain the mean value to the reference value so that the transversal filter produces the equalized signal.

REFERENCES:
patent: 3537038 (1970-10-01), Rich
patent: 3736414 (1973-05-01), McAuliffe
patent: 4071827 (1978-01-01), Koike et al.
patent: 4141072 (1979-02-01), Perreault

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