Video processing in which high frequency luminance components are folded into a mid-band spectrum
Patent 4831463 Issued on May 16, 1989. Estimated Expiration Date: 
January 30, 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.
January 30, 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 1769920 3764739 Method and apparatus for separation of chrominance and luminance with adaptive comb filtering in a quadrature modulated color television system Method and apparatus for PCM-encoding NTSC color television at sub-Nyquist rate Method and apparatus for separation of chrominance and luminance with adaptive comb filtering in a quadrature modulated color television system Method and an apparatus for video tape recording Patent #: 4323915 InventorApplicationNo. 07/009245 filed on 01/30/1987US Classes:386/27, Compressing when recording or decompressing when reproducing348/665, Including comb filter (e.g., using line, field, frame delays)375/240.21, Subsampling386/13Time (e.g., phase or frequency) correctionExaminersPrimary: Hix, L. T.Assistant: Rutledge, D. Attorney, Agent or FirmInternational ClassesH04N 9/797 (20060101)H04N 7/46 (20060101) H04N 9/85 (20060101) H04N 7/08 (20060101) H04N 9/82 (20060101) H04N 9/79 (20060101) H04N 7/26 (20060101) AbstractApparatus is disclosed for processing incoming scanning lines of video information having a nominal bandwidth for use with a bandwidth degrading path, such as magnetic tape.A preprocessor includes a preprocessor comb filter for comb filter processing of the incoming scanning lines to assure the presence of spectral gaps between energy groups in the spectrum of the video information. A fold over circuit folds over high frequency video components of the video information about a predetermined folding frequency to provided folded video. A low pass filter filters the resultant folded video to limit the spectrum thereof to be not greatly in excess of one half of the folding frequency.A postprocessor includes an unfolding circuit for unfolding the signal from the path about the predetermined folding frequency. A postprocessor comb filter processes the unfolded signal to eliminate unwanted alias components therein resulting during the unfolding process and provides a resultant video signal closely approximating the bandwidth and content of the original video information.Other References
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