Vertical filter circuit for PIP function

Details Vertical filter circuit for PIP function Vertical filter circuit for PIP function

1995-06-30

1997-08-12

Harvey, David E.

Television

Basic receiver with additional function

For display of additional information

348458, 348581, H04N 701

Patent

active

056570937

ABSTRACT:
A vertical filter circuit providing a PIP function, which can be used for constructing a sub-screen when the input signal of a main screen is a double-scanned signal or a HDTV signal, compresses the vertical lines of the sub-screen into two-thirds of the original image. Preferably, the vertical filter includes an array of logical elements, a one line memory, two switches for signal routing and a control signal generator operating selected ones of the logical elements and the switches responsive to the horizontal and vertical sync signals.

REFERENCES:
patent: 4665439 (1987-05-01), Naimpally
patent: 4768093 (1988-08-01), Prodan
patent: 5065243 (1991-11-01), Katagiri
patent: 5349385 (1994-09-01), Glenn
patent: 5422677 (1995-06-01), Do

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