Sub carrier phase shifters

Details Sub carrier phase shifters Sub carrier phase shifters

1975-06-03

1977-01-11

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

307262, 328155, 358149, H04N 9539, H04N 522, H03K 112, H03K 513

Patent

active

040030784

ABSTRACT:
A sub carrier phase shifting circuit for use in digital television equipment comprising at least two monostable multivibrators connected in cascade. The sub carrier signal is applied to the first multivibrator. Adjusting means are connected to the control inputs of each multivibrator for adjusting the monostable period of the multivibrators. On receipt of an edge of a sub carrier wave the first multivibrator is driven from a first state to a second state whereby the first multivibrator effects a change of state at its output. The first multivibrator resets to its first state after the monostable period determined by the adjusting means to give an output delayed in relation to the edge of the sub carrier wave. The delayed output causes the second multivibrator to be driven from one state to its other whereby the second multivibrator effects a change of state at its output. The second multivibrator resets to its first state after the monostable period of the second multivibrator has elapsed, to give an output further delayed in relation to the edge of the sub carrier wave.

REFERENCES:
patent: 3311702 (1967-03-01), Legler
patent: 3449510 (1969-06-01), Steinkopf
patent: 3493680 (1970-02-01), Brown
patent: 3571732 (1971-03-01), Richardson
patent: 3657732 (1972-04-01), Krause
patent: 3863264 (1975-01-01), Nelson et al.
patent: 3867010 (1975-02-01), Rzeszewski
"Delay Multivibrator;" Epsco Components; Bull. TDC-113; Nov. 1, 1958, pp. 1, 2.

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