Method and apparatus for processing color television signals

Details Method and apparatus for processing color television signals Method and apparatus for processing color television signals

1978-11-06

1980-08-12

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

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358 4, 358 8, 358 15, 358 16, H04N 900

Patent

active

042176034

ABSTRACT:
Methods and apparatus for processing color television signals for recording and playback on a magnetic tape and for subsequent display on a conventional Phase Alternation Line (PAL)-type color television receiver. A number of embodiments of the invention are disclosed for converting both PAL and National Television Systems Committee (NTSC)-format color television signals to a transfer channel format for recording on the magnetic tape, and for converting the signal recovered from the tape to a special output format suitable for reception by a conventional PAL-type color television receiver. The special output format includes a chrominance subcarrier that has a fixed phase angle and that is amplitude modulated by a special combination of color difference signals. This special chrominance subcarrier can be produced without the need for a delay line and can be properly demodulated by a conventional PAL-type receiver as though it were in a conventional quadrature subcarrier fornat.

REFERENCES:
patent: 3617620 (1971-11-01), Arimura
patent: 3717725 (1973-02-01), Numakura
patent: 3764739 (1973-10-01), Faroudja
patent: 4117509 (1978-09-01), Boer
patent: 4123774 (1978-10-01), Hjortzberg

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