Field number doubling circuit for a television signal

Details Field number doubling circuit for a television signal Field number doubling circuit for a television signal

1988-04-07

1989-07-25

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358152, H04M 701

Patent

active

048519081

ABSTRACT:
A field number doubling circuit has a measuring circuit (25) for determining the starting instant of a second read operation of a memory circuit (3) with respect to that of a first read operation in such a way that a display of a field number doubled television signal, even for a non-standard television signal to be doubled in field number, does not exhibit any flicker at the field frequency of the last-mentioned signal. Furthermore, the measuring circuit can determine the most favorable waiting period (B) between a write operation and a first read operation, the waiting period (A) between a vertical synchronizing pulse (V) and the start of a memory write operation, and a value for the waiting period (C) between the start of a memory read operation and the start of vertical deflection of a picture display section (13). A counter circuit (29) which can be controlled by means of the measuring circuit is provided for the controllable periods.

REFERENCES:
patent: 4587557 (1986-05-01), Doornhein
patent: 4604651 (1986-08-01), Frencken
patent: 4684986 (1987-08-01), Steenhof
patent: 4701793 (1987-10-01), Den Hollander
patent: 4724485 (1988-02-01), Golab
patent: 4740842 (1988-04-01), Annegarn

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