Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1974-09-19
1976-04-20
Richardson, Robert L.
Facsimile and static presentation processing
Static presentation processing
Attribute control
178 66DC, 360 38, H04N 576
Patent
active
039523268
ABSTRACT:
The invention relates to a dropout compensator for a trisequential color video playback system which compensates for dropouts in color video signals with a high degree of accuracy. Only the color information including the Y low portion of the luminance signal is delayed for a period of substantially one line of video information after separation of the color information from the Y high portion of the luminance signal and after FM demodulation of the color information signals. In addition to the two conventional delay means, connected in series, present in a trisequential system and necessary for converting time-sequential occuring color signals into signals occurring at the same time, there is provided a third delay means for the compensation of dropouts. The output signal of the third delay means is switched by a switch means to the entrance of the first two delay means, the switch means being controlled by a detector means detecting a signal level decrease in the envelope of the FM signal when a dropout occurs.
REFERENCES:
patent: 3560635 (1971-02-01), Bruch
patent: 3586762 (1971-06-01), Hodge et al.
BASF - Aktiengesellschaft
Richardson Robert L.
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