The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 07, 1980
Filed:
Sep. 21, 1978
John P Rossi, Stamford, CT (US);
CBS Inc., New York, NY (US);
Abstract
A sub-Nyquist sampled PCM NTSC color television signal is obtained directly from a PCM encoded color television signal sampled at four times the color subcarrier frequency by selecting every other sample in each line of the 4F.sub.sc sampled television signal and introducing a one 4F.sub.sc sample displacement every two sequential television lines. A sub-Nyquist sampled signal may also be obtained from an NTSC color television signal having a color subcarrier frequency F.sub.sc by generating a sampling signal having a frequency of 2F.sub.sc, the sampling phase of which shifts by 180.degree. every alternate time sequential television line, and sampling the NTSC color television signal in response to the sampling signal. Whichever of these two techniques is used to obtain the sub-Nyquist samples, the 4F.sub.sc samples can be reconstructed when comb filters are used to remove alias components. The process of converting 4F.sub.sc encoded signals to sub-Nyquist and back to 4F.sub.sc can be repeated without impairing picture quality beyond that introduced during the first conversion-reconversion process.