Method and apparatus for encoding component digital video signals so as to compress the bandwidth thereof, and for decoding the same
Patent 4742386 Issued on May 3, 1988. Estimated Expiration Date: 
March 6, 2007. 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.
March 6, 2007. 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 References 2736859 Digital processing of PAL color television signals in the form of a Y signal and a composite U+V/U-V signal Processing of N.T.S.C. color television signals Method and apparatus for decoding and recording composite digital television signals to prevent degradation of the signals Single sideband modulated chrominance information for compatible high-definition television Television signal transmission system Patent #: 4660072 InventorAssigneeApplicationNo. 07/022965 filed on 03/06/1987US Classes:375/240.25Specific decompression processExaminersPrimary: Shepperd, John W.Attorney, Agent or FirmInternational ClassH04N 11/04 (20060101)Foreign Application Priority Data1986-04-02 GBAbstractA component digital video signal is encoded such that first and second color components CB, CR are modulated on the lower sideband of a carrier at the Nyquist frequency of the luminance component Y. The encoding method involves alternately adding and subtracting the luminance and color component signals Y+C, Y-C, Y+C, Y-C, (etc) and changing the phase relationship between this addition and subtraction for the first and second color components every field, so that in each alternate field the addition and subtraction operations are in phase for both color components CB, CR and in every other field, the operations are out of phase. Upon decoding, the encoded video signal is comb filtered to recover the luminance component Y and color components CB, CR, and the correct phase for the color components (CB, CR) is restored by a phase alternation operation which is inverse to that applied during encoding. | |
