Method and apparatus for processing a composite synchronizing si

Details Method and apparatus for processing a composite synchronizing si Method and apparatus for processing a composite synchronizing si

1994-11-15

1997-05-20

Lee, Michael H.

Television

Synchronization

Sync separation

348529, H04N 508

Patent

active

056317093

ABSTRACT:
A pulse separator 110 predicts the start of a vertical synchronizing pulse in a video composite synchronizing signal (VCSS) applied via input 105. At a predicted time, the pulse separator 110 provides a start signal via a first output to the bistable 125, thereby causing a signal at output 130 to vary from a first output level to a second output level. When the end of the vertical synchronizing pulse is detected in the VCSS, a stop signal is provided via a second output to the bistable 125, thereby causing the signal at the output 130 to vary from the second level to the first level. A multiplexer (MUX) 615 switched to couple horizontal synchronizing pulses from input 605 to output 620, when a vertical synchronizing pulse is received from input 625, and, switched to coupled pseudo horizontal synchronizing pulses from pseudo pulse generator 610 to the output 620 when a vertical synchronizing pulse is not received from the input 625.

REFERENCES:
patent: 4122488 (1978-10-01), Mikado
patent: 4227214 (1980-10-01), Morito et al.
patent: 4258389 (1981-03-01), Sakamato
patent: 4535353 (1985-08-01), Turner
patent: 4535358 (1985-08-01), Duijkers
patent: 4684988 (1987-08-01), Johannes
patent: 5003391 (1991-03-01), Peters et al.
patent: 5303046 (1994-04-01), Masuda

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