Digital time base corrector oscillators

Details Digital time base corrector oscillators Digital time base corrector oscillators

1975-03-13

1976-07-20

Griffin, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

360 36, 331 20, H04N 576

Patent

active

039710637

ABSTRACT:
The television digital time base corrector for television equipment comprises an analogue to digital converter for receiving a video analogue signal, a store for receiving the successive line information in digital form from the output of the analogue to digital converter, a digital to analogue converter for receiving the stored signal, a read/write control circuit for writing the digital information into the store, an input oscillator for determining the rate of conversion of the analogue signal and the rate of writing into the store and output oscillator for controlling the rate of reading out of the digital information from the store and the rate of conversion of the digital information in the store. The input oscillator is in the form of a triggered oscillator which is switched on and off in time relationship with the video sync pulse and/or sub-carrier color burst, the period of switching on and off and the frequency of the oscillator being dependent upon the duration of the lines. Thus the length of the train of sampling clock pulses is varied in sympathy with the off-tape line period by changing the frequency of the clock pulses from line to line.

REFERENCES:
patent: 3428745 (1969-02-01), Coleman, Jr. et al.
patent: 3749836 (1973-07-01), Hayami et al.
patent: 3752912 (1973-08-01), Ohsawa et al.
patent: 3763317 (1973-10-01), Coleman, Jr. et al.
patent: 3860952 (1975-01-01), Tallent et al.

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