Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1981-05-29
1984-07-17
Faber, Alan
Facsimile and static presentation processing
Facsimile
Recording apparatus
358 24, 360 101, H04N 593
Patent
active
044609256
ABSTRACT:
A single field or picture of a PAL color television signal is stored in a store and provides a signal at an input (52). The stored signal consists of 2f.sub.sc samples taken at 45.degree. to the U-axis. The signal is separated by a filter (56) and subtractor (58) into a high frequency or chrominance signal and a low frequency or luminance signal. The chrominance signal is delayed by delay means (62) such that the chrominance components of two lines which are an odd number of lines apart are made available simultaneously. These signals are combined by switches (S1, S2) and/or combining circuits (68) to provide a signal at 4f.sub.sc which is combined with the luminance signal in a combining circuit (70) to provide a 4f.sub.sc PAL output (72). The manner of the combination of the chrominance components is changed on an 8-field cycle. In an alternative arrangement, if the PAL signal is originally stored in a store which provides outputs from more than one line simultaneously, two stored lines can be combined, and the chrominance portion of the thus-combined signal combined with the luminance portion of a stored signal to provide the output.
REFERENCES:
patent: 3921132 (1975-11-01), Baldwin
patent: 4051516 (1977-09-01), Weston
patent: 4057827 (1977-11-01), Hoogendijk
patent: 4090218 (1978-05-01), Buul
"Digital Videotape Recording: An Analysis of Choices", by Diermann, vol. 87, Jun. 1978, pp. 375-378, SMPTE Journal.
British Broadcasting Corporation
Faber Alan
O'Connell Robert F.
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