Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1986-01-13
1988-05-10
McElheny, Jr., Donald
Facsimile and static presentation processing
Facsimile
Recording apparatus
358340, 358343, H04N 576
Patent
active
047439807
ABSTRACT:
A videodisc recorder signal processing system and a recording method providing programmed control of the amplitude of the secondary (audio channel) carrier signals relative to the primary (video channel) carrier signal during recording. In one embodiment, the amplitude of the two audio carrier signals are varied in accordance with a preprogrammed profile to counteract the MTF effects of the recording system. In another embodiments, the amplitudes of the two audio carriers are varied in accordance with a preprogrammed pattern related to the relative criticality of the audio and video information recorded on the disc. The signal characteristics of the audio channels are improved by increasing the amplitude of the audio carriers. When no audio information exists, the audio carrier signals are substantially eliminated to maximize the quality of the video channel. At other times, the audio carrier signals are decreased to improve the video quality by reducing IM products.
REFERENCES:
patent: 3830968 (1974-08-01), Redlich et al.
patent: 4051533 (1977-09-01), Griffiths
patent: 4225873 (1980-09-01), Winslow
patent: 4525751 (1985-06-01), Freeman et al.
patent: 4616356 (1986-10-01), Wilkinson et al.
Brown Steven P.
McElheny Jr. Donald
Optical Disc Corporation
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