Vertical filter circuit for picture in picture display device of

Details Vertical filter circuit for picture in picture display device of Vertical filter circuit for picture in picture display device of

1995-07-24

1997-04-29

Burgess, Glenton B.

Television

Basic receiver with additional function

For display of additional information

348565, H04N 5262

Patent

active

056254199

ABSTRACT:
A vertical filter circuit for a picture in picture (PIP) display device in a video system such as a television set is capable of vertically filtering image data to be received in accordance with a selected scan mode. The vertical filter circuit includes a control unit receiving a horizontal sync signal and generating a first control signal used in selecting an attenuation coefficient and generating a second control signal for controlling the number of horizontal lines to be compressed, an attenuating unit attenuating and outputting the received image data according to the attenuation coefficient selected using the first control signal, an adding unit connected to the attenuating unit, for adding and averaging the attenuated image data received from the attenuating unit and a line memory, the line memory being connected to the adding unit and storing the attenuated image data, and a switching unit connected the line memory, and having a first output terminal to output the stored image data, and having a second output terminal connected to the adding unit. The switching unit is switched responsive to the second control signal. The vertical filter attenuates the image data received during a horizontal line period with the attenuation coefficient determined by the first control signal, and compresses the image data averaged over a predetermined member of horizontal lines responsive to the second control signal. A vertical filtering method is also disclosed.

REFERENCES:
patent: 4665439 (1987-05-01), Naimpally
patent: 4971448 (1990-11-01), Van Zon
patent: 5111297 (1992-05-01), Tsuji et al.
patent: 5459528 (1995-10-01), Pettitt

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