Title:
METHOD OF REFORMATTING COLOR TELEVISION SIGNALS
Document Type and Number:
WIPO Patent Application WO/1987/007809
Kind Code:
A1
Abstract:
A method and apparatus for reformatting MAC color television signal to reduce bandwidth. Chrominance and luminance components are serially arranged on a line by line basis with the luminance component not compressed or minimally compressed. The aspect ratio is reduced from the standard aspect ratio by a gate (5) which truncates the edges and feeds the MAC signals into memories (10, 11) for subsequent time expansion. Since a normal television picture tube overscans, the edges of the picture are never displayed and need not be transmitted or recorded. The reformatted signal can be made compatible with a standard composite signal by merely expanding (22) and modulating the chrominance and adding to the luminance (25). The compatible signal has a shorter active video time and a smaller aspect ratio.
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Inventors:
RHODES CHARLES W (US)
Application Number:
PCT/US1987/001297
Publication Date:
December 17, 1987
Filing Date:
May 28, 1987
Export Citation:
Assignee:
SCIENTIFIC ATLANTA (US)
International Classes:
H04N9/77; H04N9/797; H04N9/81; H04N11/02; H04N11/08; H04N11/10; (IPC1-7): H04N11/02; H04N11/10
Foreign References:
| US4605950A | 1986-08-12 | |||
| US4622577A | 1986-11-11 | |||
| US4631574A | 1986-12-23 | |||
| EP0114693A2 | 1984-08-01 | |||
| US4567508A | 1986-01-28 | |||
| US4476484A | 1984-10-09 | |||
| US3617626A | 1971-11-02 | |||
| US4564857A | 1986-01-14 | |||
| US4556906A | 1985-12-03 | |||
| US4394690A | 1983-07-19 | |||
| US4245235A | 1981-01-13 |
Other References:
See also references of EP 0268674A1
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