Apparatus for removing ghost from television signals including a

Details Apparatus for removing ghost from television signals including a Apparatus for removing ghost from television signals including a

1992-12-28

1994-05-10

Groody, James J.

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

H04N 521

Patent

active

053113136

ABSTRACT:
A television ghost removal apparatus comprises a transversal filter that receives input television signals, compensates waveform distortion included in the signals, and removes a ghost component; a waveform extractor that extracts signal waveforms of predetermined periods that include reference signals for ghost detection from the television signals; a coefficient setter that compares reference waveform signals and the extracted signal waveforms to obtain error signals, and sets coefficient data corresponding to the error signals, and in accordance with this coefficients data, changes filter coefficient of the transversal filter; a band limiter means for removing unnecessary high-region components included in the coefficient data, and supplying the coefficient data from which the unnecessary high-region components have been removed to the transversal filter means, the unnecessary high-region components being outside a frequency band of the reference signal; and a counter means for counting the number of times that the coefficient data have been generated by the coefficient setting means until the television signals return to a status where ghost has been removed, and for activating the band limiter means when the number of times reaches a predetermined number.

REFERENCES:
patent: 5025317 (1991-06-01), Koguchi
patent: 5053870 (1991-10-01), Ito
patent: 5138453 (1992-08-01), Kobayashi

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