Discrimination circuit for a line sequential signal

Details Discrimination circuit for a line sequential signal Discrimination circuit for a line sequential signal

1984-10-12

1986-11-18

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 18, H04N 1118

Patent

active

046239146

ABSTRACT:
An identification signal is produced on the basis of the difference between the potentials in the adjacent horizontal blanking periods of a demodulated line sequential color signal. Therefore, a delay, if, of the discrimination timing can be substantially ignored when compared to the system using narrow-bandpass filters, and the color signals can be accurately discriminated without delay. Further, by the virtue of the provision of the horizontal scanning period rate conversion circuit, a pulse which is synchronous with the horizontal signal and appears accurately at the time interval of one horizontal scanning period is based on for effecting the accurately desired discrimination, so that the discrimination can be reliably effected at the desired position without an adverse effect of noise, a dropout in magnetic recoding or the like.

REFERENCES:
patent: 4072983 (1978-02-01), Aschwander
patent: 4145711 (1979-03-01), Aschwander
patent: 4191965 (1980-03-01), Nelson
patent: 4240102 (1980-12-01), Groeneweg
patent: 4357623 (1982-11-01), Hinn
patent: 4574301 (1986-03-01), Sachs

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