Television – Format conversion
Patent
1993-01-27
1994-07-05
Groody, James J.
Television
Format conversion
348180, H04N 701
Patent
active
053272358
ABSTRACT:
A digital video signal is real-time converted from a high definition format (such as 1250 lines, 50 field/s, 2:1 interlace, with a 16:9 aspect ratio) to a conventional definition format (such as 525 lines, 60 field/s, 2:1 interlace, with a 4:3 aspect ratio) by compressing the image so that the active area extends across only part of an intermediate field/frame; by writing the pixels of the high definition fields to alternate field stores at the high definition format pixel rate; and by forming the output frames in the conventional definition format by reading, at the conventional definition pixel rate, pixels of at least part of the active portion from the field store which is not being written. Alternatively, a conventional definition format signal is converted to a high definition format by placing each conventional definition field in a portion of a high definition field and then expanding that portion substantially to fill the high definition field. In order to deal with a change in field rate between the input and output video, a standards converter is included in the high definition part of the arrangement.
REFERENCES:
patent: 3457369 (1966-02-01), Davies et al.
patent: 3803352 (1974-04-01), Goldberger
patent: 4862266 (1989-08-01), Gillard
patent: 5221966 (1993-06-01), Clayton et al.
Burgess Glenton B.
Frommer William S.
Groody James J.
Sinderbrand Alvin
Sony United Kingdom Limited
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