Automatic equalizer

Details Automatic equalizer Automatic equalizer

1982-07-01

1984-11-06

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

358905, 333 18, H04B 314

Patent

active

044816430

ABSTRACT:
An automatic equalizer has a transversal filter circuit for equalizing an input signal to be equalized and providing an equalized output according to the value of tap coefficients thereof. The transversal filter circuit includes a low-pass filter (LPF) at its output stage. The equalized output is subjected to a phase shift by the LPF. The equalized output is applied to a sign circuit as well as a wave integration circuit. The sign circuit generates a sign signal indicating a rate of change of the equalized output to time. The wave integration circuit generates a differentiated wave signal indicating the change of wave form or the change of amplitude information of the equalized output. The sign and wave signals are applied to a correlator which performs the correlation operation of the sign and wave signals and providing a tap coefficient control signal. This control signal is used for determining the tap coefficients of the transversal filter circuit.

REFERENCES:
patent: 3617635 (1971-11-01), Hirsch
patent: 4071827 (1978-01-01), Koike et al.
patent: 4201959 (1980-05-01), Niiro et al.
patent: 4389623 (1983-06-01), Onishi et al.
S. Makino et al., "A Fully Automatic Ghost Canceller", IEEE Transaction CE-24, Aug. 3, 1978, p. 267.
S. Makino et al., "A Novel Automatic Ghost Canceller", IEEE Trans. CE-25, Aug. 4, 1979, p. 555.

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