Reference signal reproduction apparatus

Details Reference signal reproduction apparatus Reference signal reproduction apparatus

1985-09-27

1987-08-18

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358158, 358149, 375120, 307269, 307514, 328 72, 328155, H04N 504

Patent

active

046880941

ABSTRACT:
The phase of a reproduction reference signal RS output from a decoder, which decodes the count value of the counter, is compared with that of an arriving horizontal synchronizing signal TH by a phase comparator. Based on this comparison result, a phase discriminating circuit discriminates whether the phase of the reproductionreference signal RS is advanced, delayed or in-phase with the arriving horizontal synchronizing signal TH. Based on this phase discrimination result, the dividing ratio setting circuit sets the dividing ratio of the counter such that the reproduction reference signal TH is pulled in with the arriving horizontal synchronizing signal TH.

REFERENCES:
patent: 3936762 (1976-02-01), Cox, Jr. et al.
patent: 4151485 (1979-04-01), LaFratta
patent: 4423520 (1983-12-01), Murayama et al.
TI Semiconductor Technical Data; SN 54LS297, SN 74LS297; by Japanese Texas Instruments Co., Ltd.; Nov. 1, 1983.

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