VIR line recognition system

Details VIR line recognition system VIR line recognition system

1977-12-12

1979-07-10

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 912

Patent

active

041609930

ABSTRACT:
A television receiver includes a recognition system identifying the 19th horizontal scanning line of each field of a transmitted television signal for coupling a vertical interval reference (VIR) signal to suitable signal processing circuitry within the receiver. The recognition system includes a timing circuit defining a pair of predetermined timing intervals in each horizontal scanning line during which the logical characteristics of the composite sync signal are sampled and interrogated. A counter is advanced to a preselected state in response to the samples exhibiting a predetermined sequence of logical characteristics occurring during the vertical sync pulse and its associated following equalizing pulse interval. Subsequently, horizontal flyback pulses are counted and the output of the counter is decoded for identifying the 19th horizontal scanning line. A carryover circuit is provided for rendering line 19 identifications for fields during which the predetermined sequence is unsatisfied in accordance with the last line 19 identification corresponding to a satisfaction of the sequence.

REFERENCES:
patent: 3867010 (1975-02-01), Rzeszewski
patent: 4089025 (1978-05-01), Banker et al.

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