NTSC-PAL converter

Details NTSC-PAL converter NTSC-PAL converter

1995-12-11

1997-01-28

Kostak, Victor R.

Television

Format conversion

Involving both line number and field rate conversion

348458, H04N 707

Patent

active

055982182

ABSTRACT:
The present invention is an NTSC-PAL converter which can eliminate generation of bar noise, and convert image data from the NTSC format to the PAL format with less memory capacity. The converter comprises three field memories (1), (2) and (3) for storing image data in the NTSC format in which odd and even-numbered field data in the NTSC format are sequentially written. In reading for forming the image data in the PAL format, two memories which are not being written are selected so that data are sequentially read from memories in combination of, for example, (1) and (2); (2) and (3), and (3) and (1). That is, frame data for the PAL format is formed by adding and reading field data, and by interpolating them in predetermined interval. This eliminates such situation where writing of image data in the NTSC format overtakes reading of PAL image data.

REFERENCES:
patent: 5166792 (1992-11-01), Lyon

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