Television – Image signal processing circuitry specific to television – Special effects
Patent
1995-02-16
1996-09-10
Harvey, David E.
Television
Image signal processing circuitry specific to television
Special effects
345127, H04N 5262
Patent
active
055550274
ABSTRACT:
There is disclosed a video processor capable of arbitrarily expanding or contracting an image in a vertical direction. A horizontal synchronizing signal HS of a video signal CS is inputted to a reference input terminal 63a of a phase comparator 63 of a PLL circuit 62 to take out a clock signal CK having a frequency N1 times larger than that of the horizontal synchronizing signal HS. This clock signal is frequency-divided by N2. Since N2 is set to the number of horizontal synchronizing signals within a vertical synchronous period, the number of sampling lines in a vertical direction becomes equal to N1. Accordingly, when an output signal (line clock signal LCK) of the frequency divider 67 is used as a signal for increment of a vertical address of a video memory 70, enlargement/contraction of an image can be carried out by changing N1.
REFERENCES:
patent: 4218710 (1980-08-01), Kashigi et al.
patent: 4325075 (1982-04-01), Kashigi et al.
patent: 4952923 (1990-08-01), Tamura
patent: 5245430 (1993-09-01), Nishimura
Harvey David E.
Seiko Epson Corp.
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