Vir line recognition system

H - Electricity – 04 – N

Patent

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350/56

H04N 9/12 (2006.01) H04N 5/10 (2006.01) H04N 7/087 (2006.01)

Patent

CA 1097796

ABSTRACT OF THE DISCLOSURE 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 charac- teristics occurring during the vertical sync pulse and its asso- ciated following equalizing pulse interval. Subsequently, hori- zontal 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 identifi- cations for fields during which the predetermined sequence is unsatisfied in accordance with the last line 19 identification corresponding to a satisfaction of the sequence. -2-

316010

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