Device for generating horizontal scanning periodic signal of pal

Details Device for generating horizontal scanning periodic signal of pal Device for generating horizontal scanning periodic signal of pal

1991-08-16

1994-01-25

Powell, Mark R.

Facsimile and static presentation processing

Static presentation processing

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358 11, 358 36, H04N 944, H04N 964, H04N 1120

Patent

active

052820203

ABSTRACT:
A device for generating a horizontal scanning periodic signal used for a PAL-system including a first clear signal generation unit for generating a first candidate clear signal when a value of the counter unit is coincident with a normal horizontal scanning period; a second clear signal generation unit for generating a second candidate clear signal when a value of the counter unit is coincident with a longer horizontal scanning period by an odd multiple of a half period of the color subcarrier frequency than the normal horizontal scanning period; and a selector unit for selecting one of the first candidate clear signal or the second candidate clear signal, wherein the second candidate clear signal is at least one signal selected during one vertical scanning period. Therefore, dot interference in PAL type television standards can be avoided by an easy improvement without increasing the circuit scale.

REFERENCES:
patent: 4322750 (1982-03-01), Lord et al.
patent: 4400719 (1983-08-01), Powers
patent: 4660074 (1987-04-01), Schine
patent: 4679005 (1987-07-01), Tatami
patent: 4769704 (1988-09-01), Hirai et al.
Elektor Electronics, vol. 14, No. 158, Jul.-Aug. 1988, London, pp. 14-17; J. C. Stekelenburg, "Chrominance-Locked Clock Generator".
Carnt, P. S., Colour Television, vol. 2, London ILIFFE Books Ltd, 1969, pp. 5, 241-266.

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