Ghost canceling apparatus

Details Ghost canceling apparatus Ghost canceling apparatus

1989-03-22

1990-08-07

Peng, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 36, 358905, H04N 5213, H04N 964

Patent

active

049472526

ABSTRACT:
A ghost canceling apparatus provided with a reference waveform Fourier coefficient holding unit in which a normal ghost detection unit holds a Fourier coefficient produced by Fourier transforming a reference waveform; a nearby region Fourier transform unit for Fourier-transforming a nearby region of a reference waveform extracted from the received television signal and a normal Fourier transform unit for Fourier transforming a normal region of the reference waveform extracted from the received television signal; a calculation unit for dividing the output from the normal region Fourier transform unit by the output from the nearby region Fourier transform unit and then for multiplying a Fourier coefficient of the reference waveform Fourier coefficient holding unit; a reverse Fourier transform unit for reverse Fourier transforming the output of the calculation unit; a tap gain supplying unit for supplying the dummy normal ghost producing unit with the output of the reverse Fourier transform unit as a tap gain of the transversal filter.

REFERENCES:
patent: 3956585 (1976-05-01), Butler et al.
patent: 4476491 (1984-10-01), Murata et al.
patent: 4502077 (1985-02-01), Morotomi et al.
patent: 4575857 (1986-03-01), Murakami
patent: 4625241 (1986-11-01), Ohzeki

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