Video signal discriminating apparatus

Details Video signal discriminating apparatus Video signal discriminating apparatus

1986-11-25

1988-01-26

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358153, 328139, 307231, H04N 1700, H04N 508

Patent

active

047220040

ABSTRACT:
A video signal discriminating apparatus comprises a pulse width measuring part for measuring a pulse width of a vertical or horizontal synchronizing pulse within a composite synchronizing signal of a video signal, a period measuring part for measuring a period of the synchronizing pulse having the pulse width thereof measured in the pulse width measuring part, and a discriminating part for discriminating that the video signal exists when the measured pulse width and the measured period are within respective predetermined ranges and for discriminating that no video signal exists when the measured pulse width and the measured period are outside the respective predetermined ranges.

REFERENCES:
patent: 4112317 (1978-09-01), Everswick
patent: 4334243 (1982-06-01), Srivastava
patent: 4511920 (1985-04-01), Iijima et al.
patent: 4675597 (1987-06-01), Hernandez
patent: 4683495 (1987-07-01), Brock

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