Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1976-09-22
1978-07-04
Griffin, Robert L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 86, H04B 350
Patent
active
040991237
ABSTRACT:
In an electrical multi-channel signal transmission system having channels with signal carriers of predetermined frequencies, each frequency is an integral multiple of a constant which is a measure of frequency spacing between channels with the addition or subtraction of an integral multiple of one or more other constants. The integral multiples of the one or more other constants are selected to cause the frequencies of significant intermodulation products produced by simultaneous treatment of carriers by electrical components, such as amplifiers, to be equal to other carrier frequencies. The frequencies are obtained from a plurality of oscillators with frequencies related to the constants. The invention is especially useful with cable television systems transmitting programs on low, mid and high band channels.
REFERENCES:
patent: 3665316 (1972-05-01), Jeffers
patent: 3898566 (1975-08-01), Switzer et al.
Powers, "Channels, Channels --------and more channels" report presented at NCTA convention, Chicago, Ill. 5/1972.
Shekel, "Freq. Band Assignments Free of Second Order Beat Interfence", proceedigs of IEEE, vol. 58, No. 7, 7/1970.
Neal, "A Consumer-Enconomics View of Proposed Catv. Channel Assignment Plans, GTE Sylvania, Inc. 1/1973.
Cappon John
Finlay Edward W.
Griffin Robert L.
Ng Jin F.
Premier Cablevision Ltd.
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