Television signal monitoring device

Details Television signal monitoring device Television signal monitoring device

1982-01-25

1983-11-22

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

358139, H04N 962

Patent

active

044172680

ABSTRACT:
An apparatus for monitoring parameters of television signals comprising an input circuit for receiving the composite video signal, a separating circuit for clamping the tips of the sync pulses at one reference level and repeatedly sampling the blanking level to establish a second reference level, a circuit for generating a first pulse suitable for input to digital logic circuits corresponding to the horizontal sync pulse, and a circuit for generating a second pulse suitable for input digital logic circuits corresponding to the video signal exceeding a preselected threshold measured from the said second reference level. A circuit generates a plurality of reference signals of fixed duration which signals are initiated by one of said first and second pulses and a circuit compares the fixed duration reference signals with said second pulse to generate error display signals. Preferably, a counting circuit clocked by said first pulse generates outputs indicative of particular video lines and is reset relative to the vertical sync pulses of the composite video signal.

REFERENCES:
patent: 3972065 (1976-07-01), Heiges, Jr.
patent: 4153911 (1979-05-01), Isono et al.
patent: 4364080 (1982-12-01), Vidovic

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