Horizontal line counter stabilization in a video receiver

Details Horizontal line counter stabilization in a video receiver Horizontal line counter stabilization in a video receiver

1994-08-24

1995-07-25

Kostak, Victor R.

Television

Synchronization

Automatic phase or frequency control

348540, 348547, H04N 504

Patent

active

054366682

ABSTRACT:
In a system for identifying specific horizontal lines of video that are included in a video signal, a horizontal line counter (100) is cleared to indicate the beginning of a vertical interval by a reset signal (VERDEL) derived from a vertical sync signal (VER). The line counter is clocked by a signal (HOR) at the horizontal sync rate that is derived from a harmonic (N.sub.-- FH) of the horizontal sync signal. The relative phase shift between the reset and clock signals for the horizontal line counter is measured (105,120). The measured phase shift is used as an input to a variable phase shifter (110) to adjust the phasing between the horizontal line counter control signals and the original sync signals. The phase adjustment permits significantly decreasing the sensitivity of the horizontal line counter to jitter of vertical sync.

REFERENCES:
patent: 4160993 (1979-07-01), Merrell
patent: 4170026 (1979-10-01), Nagaoka et al.
patent: 4198651 (1980-04-01), Barton et al.
patent: 4224639 (1980-09-01), Belisomi
patent: 4227214 (1980-10-01), Morito et al.
patent: 4616259 (1986-10-01), Moran et al.
patent: 4954893 (1990-09-01), Urakami
patent: 5138451 (1992-08-01), Shinkawa et al.
patent: 5251015 (1993-10-01), Rumreich

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