Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1982-08-26
1985-10-29
Chin, Tommy P.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358140, H04N 502
Patent
active
045503354
ABSTRACT:
A digital television system in which signals are sampled at 13.5 MHz and produce an integer number of samples during each horizontal line interval whether the signals are based upon PAL/SECAM or NTSC standards. In order to make the digital system hierarchical and to adapt it for simple transcoding from an NTSC signal sampled at 4 times color subcarrier, the number of samples occurring during the active portion of each horizontal line is made equal to 704. Transcoding by interpolation from 4XSC--sampled NTSC video to the digital system is accomplished by selecting a particular number of samples per active line such that small blocks of samples can be transcoded independently, which allows interpolation to be achieved simply.
REFERENCES:
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A letter dtd. Jun. 27, 1980 to R. S. Hopkins from S. N. Baron describing use of 13.5 MHz, described at p. 3, lines 24-32, of the parent specification.
SMPTE Journal, vol. 85, Mar. 1976, pp. 141-145, article entitled "PCM NTSC Television Characteristics".
SMPTE Journal, vol. 88, Aug. 1979, pp. 550-554, articles entitled "Low Bit-Rate System for Digital Coding of the Television Picture".
German language Nachrichtentechische Zeitschrift (NTZ), Nov. 6, 1971, pp. 321-325, article entitled "Moglichkeiten der Farbfernsehsignaleng", (Possibilities of Digital Coding and Transmission of Color Television Signals).
A letter dtd. Oct. 8, 1980 by Frank Davidoff described at p. 3, line 32 of the specification (parent), Western Electric Technical Digest, No. 26, Apr. 1972.
Chin Tommy P.
Emanuel Peter M.
Meise William H.
Rasmussen Paul J.
RCA Corporation
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