Method and apparatus for controlling expanded sweeps

Details Method and apparatus for controlling expanded sweeps Method and apparatus for controlling expanded sweeps

1994-12-05

1996-03-26

Groody, James J.

Television

Image signal processing circuitry specific to television

Sweep expansion or reduction

348511, 348184, H04N 3223

Patent

active

055025110

ABSTRACT:
A method and apparatus provides sweep control signals for an expanded display of a selected portion of a television signal. A first counter is preloaded with a number related to the position of the left hand edge of the selected portion of the waveform being monitored and a second counter is preloaded with a number related to the position of the right hand edge of the selected portion of the waveform. Clock pulses are counted by the first counter until the number preloaded therein is reached and then the second counter counts the clock pulses until the number preloaded therein is reached. Control signals are developed when each of the counters has counted the number preloaded therein.

REFERENCES:
patent: 4227215 (1980-10-01), Gurley et al.
patent: 4739403 (1988-04-01), Mark
patent: 5347317 (1994-09-01), Sakurai

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