Television – Format conversion – Involving both line number and field rate conversion
Patent
1997-05-01
2000-09-12
Lee, Michael H.
Television
Format conversion
Involving both line number and field rate conversion
348458, 348459, 348714, H04N 701, H04N 1120
Patent
active
06118487&
ABSTRACT:
For compatible transmission of a television picture having an aspect ratio of 16:9 within a 4:3 system, transmission is effected in the letterbox format in accordance with the PALplus system specification. The receiver reconstructs the original picture with the aid of vertical filters and is able, furthermore, to suppress crosstalk interference from the luminance signals in the chrominance signals. To further improve the picture quality, the picture is displayed at a frame frequency of 100 Hz. For this purpose, the picture supplied at 50 Hz with line interlacing must be converted to a frame frequency of 100 Hz. Known concepts for PALplus decoding and 100 Hz conversion carry out these processes separately and in doing so require a great deal of memory space. By virtue of the memory control according to the invention, in which a field is stored in different memory areas (M1, M2), successive lines of a field not being stored in successive address areas or only partially being stored in successive address areas, the PALplus decoding and simultaneous 100 Hz conversion are possible with two memory modules. As a result, a decoder with 100 Hz reproduction is possible with reduced costs.
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Copy of Search Report Oct. 10, 1996.
E. d'Ambrosio et al.: "A 2.9 Megabit Field Memory Especially Suitable for PALplus Applications", Aug. 1, 1994, IEEE Transactions on Consumer Electronics, vol. 40, No. 3, pp. 718-726.
German Search Report dated: Sep. 15, 1997.
Hirtz Gangolf
Hollmann Thomas
Maier Michael
Deutsch Thompson-Brandt GmbH
Herrmann Eric P.
Kurdyla Ronald H.
Lee Michael H.
Tripoli Joseph S.
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