Automatic equalizer ulitizing a preiodically contained reference

Details Automatic equalizer ulitizing a preiodically contained reference Automatic equalizer ulitizing a preiodically contained reference

1981-05-18

1983-06-21

Gensler, Paul L.

Wave transmission lines and networks

Pilot current-controlled systems

333 18, 358905, H04B 310, H04N 521

Patent

active

043896235

ABSTRACT:
An automatic equalizer comprises a transversal filter connected to receive an input signal such as a television signal in which a predetermined periodic reference signal is present and having variable tap gains, and a correlator for forming the correlation between the input and output signals of the transversal filter and correcting the tap gains of the transversal filter to cancel out distortion components such as ghost component contained in the input signal. For the purpose of preventing the slow convergence and fluctuation of tap gains of the transversal filter due to non-periodic noise components contained in the input signal, a circuit is further provided to integrate a predetermined portion of the waveform of the reference signal contained in the input signal. An output signal of the waveform integrator circuit is correlated with the output signal of the transversal filter by the correlator.

REFERENCES:
patent: 4127874 (1978-11-01), Iwasawa et al.
patent: 4250472 (1981-02-01), Hashimoto
"A Fully Automatic Ghost Canceller" by S. Makino et al., CE-24, No. 3, Aug. 1978, p. 267.
IEEE Transactions "A Digitized Automatic Ghost Canceller" by J. Murakami et al., CE-25, No. 4, Aug. 1979, p. 555.

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