Input oscillators for time base correctors

Details Input oscillators for time base correctors Input oscillators for time base correctors

1975-06-06

1976-11-02

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

178 695CB, H04N 576

Patent

active

039901033

ABSTRACT:
An input oscillator for use in a digital time base corrector comprising a triggered oscillator circuit and a variable period delay device having a first input for receiving the synchronizing pulse and for producing an output pulse whose back edge coincides approximately in time with the center of the filtered colour burst. A select burst transition device has an input connected to the delay device and an output for triggering the oscillator circuit. A window circuit has an output connected to a second input of the delay device. A pulse former is provided controlled from the trailing edge of the output of the delay device. The bistable window circuit effects change of the delay period of the delay device when the output of the pulse former coincides in the window circuit with a burst transition whereby the trailing edge of the output of the delay device is made to occur between burst transitions.

REFERENCES:
patent: 3030438 (1962-04-01), Newell
patent: 3100816 (1963-08-01), Coleman et al.
Coleman, "A New Technique for Time-Base Stabilization of Video Recorders," IEEE Transactions on Broadcasting, vol. BC-17, No. 1, Mar. 1971, pp. 28-36.

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