Digital time base correctors for television equipment

Details Digital time base correctors for television equipment Digital time base correctors for television equipment

1975-03-13

1976-08-31

Griffin, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

360 36, 331 20, H04N 576, H04N 946

Patent

active

039785190

ABSTRACT:
The television digital time base corrector 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 said store, an input oscillator for determining the rate of conversion of the analogue signal and the rate of writing the store, and an 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 timed relationship with the video sync pulse and/or sub-carrier color burst. The oscillator thus commences its pulse generation at a time which is directly related to the timing of the sync pulse.
The oscillator is of a fixed frequency and produces a series of pulses sufficient to allow all the incoming video information in one line to be converted and then stops oscillating. The oscillator is retriggered by the next start pulse derived from the incoming sync pulse information.

REFERENCES:
patent: 3428745 (1969-02-01), Coleman, Jr. et al.
patent: 3507983 (1970-04-01), Leman
patent: 3733432 (1973-05-01), Arimura 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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