Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-09-13
1991-06-25
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358142, 358105, 358138, H04N 704
Patent
active
050272063
ABSTRACT:
Use is made of a digitally assisted DATV to effect a bandwidth reduction encoding and bandwidth reduction decoding, in addition to MAC-coding and MAC-decoding, of at least three picture signal channels (PC) each having a different picture signal refresh period equal to, for example, 80, 40 and 20 ms which are coupled via a time-division multiplex circuit (MUX). For with the diversity of picture signal sources, it was found that distinguishing during the picture signal processing between a film mode (SW1, T40) and a non-film mode (SW1, T20) results in a significantly improved high-definition picture resolution. This distinction is expressed at the DATV by one information bit (FM'). During the non-film mode (SW1, T20) three Y-liminance channels (PC11, PC13 and PC12) of 80, 40 and 20 ms and two U and V-chrominance channels (PC21 and PC22) of 80 and 20 ms are operative. During the film mode (SW11, T40) the Y-channels (PC11 and PC13) and the U and V-channels (PC21 and PC23) of 80 and 40 ms are only operative.
REFERENCES:
patent: 4641188 (1987-02-01), Dischert
patent: 4941044 (1990-07-01), Trew
patent: 4965667 (1990-10-01), Trew et al.
Sforey, R., "HDTV Motion Adaptive Bandwidth Reduction Using DATV", BBC Research Report #1986/5.
Carey Smith Christopher M.
Vreeswijk Franciscus W. P.
Britton Howard W.
Harvey David E.
Marion Michael E.
U.S. Philips Corporation
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