Frequency determining apparatus

Details Frequency determining apparatus Frequency determining apparatus

1983-03-22

1985-12-24

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

328 63, 328179, 328187, 358153, H04N 505

Patent

active

045610215

ABSTRACT:
A frequency determining apparatus discriminates between two different frame frequencies in television signals. A binary counter (4) makes a 1/64 frequency division of a horizontal synchronizing signal outputted from a horizontal synchronizing signal producing circuit (2), and further makes a 1/2 frequency division of the frequency divided output therefrom. A NAND gate (5) is responsive to the 1/64 frequency divided output and the 1/2 frequency divided output from the binary counter to detect the normal frame signal at 60 Hz, thereby to set a D-type flip-flop (8). Another NAND gate (51) is responsive to the signal obtained by inverting the 1/64 frequency divided output from the binary counter (4) and the 1/2 frequency divided signal to detect the normal frame signal at 50 Hz, thereby to set another D-type flip-flop (81). An R-S flip-flop (13) is set by the respective outputs from these D-type flip-flops whereby a desired determined signal is outputted.

REFERENCES:
patent: 2654801 (1953-10-01), Atwood
patent: 4253116 (1981-02-01), Rodgers
patent: 4298890 (1981-11-01), Lai
IBM Technical Disclosure Bulletin, vol. 5, No. 11, Apr. 1963, J. R. Featherston, "Digital Demodulator".

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