Video recorder with increased bandwidth recording
Patent 4984093 Issued on January 8, 1991. Estimated Expiration Date: 
September 12, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 12, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMethod and system using sequentially encoded color and luminance processing of video type signals to improve picture quality Method and apparatus for converting C-MAC television signals for transmission over a limited bandwidth medium Video recording apparatus having low and high resolution operational modes Video processing in which high frequency luminance components are folded into a mid-band spectrum Patent #: 4831463 InventorsAssigneeApplicationNo. 242836 filed on 09/12/1988US Classes:386/28Phase shiftingExaminersPrimary: McElheny, Donald Jr.Attorney, Agent or FirmForeign Patent References
International ClassH04N 009/83Foreign Application Priority Data1987-09-17 DEAbstractA luminance signal is frequency modulated with an FM carrier to generate a frequency modulated YFM signal having a frequency spectrum within a frequency band of e.g. 1.6 to 8 megahertz. A quadrature modulated PAL color signal is down-converted in a mixer to the empty frequency band below the YFM band and filtered by a Nyquist filter having a Nyquist slope centered on the mixing carrier frequency of e.g. 1 megahertz. The YFM and down-converted color signals are added and then recorded on magnetic tape. The frequency spectrum of the down-converted color signal has a vestigial sideband characteristic that permits the recording of a relatively wideband color signal in the luminance-free free frequency band of e.g. 0-1.2 megahertz.Other References
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