Sampling phase identification apparatus

Details Sampling phase identification apparatus Sampling phase identification apparatus

1975-05-30

1976-07-13

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

178 695CB, 358 17, H04N 944, H04N 576

Patent

active

039697606

ABSTRACT:
The apparatus for comparing clock phase identification signals in a time base corrector so as to control the Writing and Reading of information into and out of storage means therein, the storage means including a plurality of stores for storing sequential line information. The apparatus includes means for deriving in-phase and anti-phase "Write" clock phase identification signals from line frequency sync signals. Selector means select one of the in-phase or anti-phase signals and first latch means receive the selected one of the signals. Means are provided for simultaneously deriving a "Read" clock phase identification signal at a frequency which is half the line frequency from a sub-carrier reference signal. Second latch means receive the Read clock phase identification signal and comparator means compare the output signals from the first and second latch means to produce a Write clock phase identification control pulse so as to select the other of the in-phase and anti-phase Write clock phase identification signals in the selector means when the states of the signals applied to the comparator means are dissimilar.

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