Television signal according to the signal-to-noise ratio of the

Details Television signal according to the signal-to-noise ratio of the Television signal according to the signal-to-noise ratio of the

1991-05-16

1993-04-27

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358905, H04N 521

Patent

active

052067270

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; an S/N measurer that measures signal to a noise ratio (S/N) of the television signals; and an S/N judgment circuit that prohibits change of the filter coefficient by the coefficient setter when the S/N has deteriorated, and that initializes the coefficient data when the S/N has recovered to a favorable status. In addition, there can be provided a band limiter circuit that removes unnecessary high-region components outside a frequency band of the reference waveform signal.

REFERENCES:
patent: 5025317 (1991-06-01), Koguchi
patent: 5053870 (1991-10-01), Ito

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