Television – Format – Including additional information
Patent
1991-02-04
1994-02-15
Groody, James J.
Television
Format
Including additional information
348473, H04N 700
Patent
active
052871800
ABSTRACT:
An NTSC bandwidth-compatible HDTV system employs multiple quadrature amplitude modulation (QAM). A first suppressed QAM carrier is modulated with high priority information including predominantly low frequency information. A second suppressed QAM carrier is modulated with low priority information including predominantly high frequency information. The high priority QAM signal exhibits a larger amplitude and narrower bandwidth than the low priority QAM signal, and is disposed in the lower portion of the multiple QAM frequency spectrum normally occupied by the vestigial sideband of a standard NTSC television signal. The frequency spectrum of the multiple QAM signal exhibits signal attenuation at frequencies associated with high energy information in a standard NTSC signal, e.g., frequencies around the NTSC picture and sound carriers.
REFERENCES:
patent: 5063445 (1991-11-01), Nishizawa et al.
patent: 5134464 (1992-07-01), Basile et al.
IEEE Transactions on Consumer Electronics, vol. 36, No. 3, Aug. 1990, IEEE, (New York), W. Bretl et al., "Video Encoding In The Spectrum-Compatible HDTV System", pp. 172-176.
Proceedings of the Third International Workshop on HDTV, "Signal Processing of HDTV, II", CSELT, Turin, Aug. 30-Sep. 1, 1989, S. N. Baron et al., "An Evolutionary Approach To Advanced Television Services: The ACTV (Advanced Compatible Television) System", pp. 195-211.
"HDS/NA: An Analog Simulcast High Definition Television System", by M. Tsinberg et al., IEEE Transactions on Consumer Electronics, vol. 36, No. 3, Aug. 1990.
General Instrument Corporation report on the Digicipher HDTV System, Jun. 8, 1990.
"Advanced Television Systems For The U.S.A." by B. J. Lechner, Information Display, May 1990.
"Spectrum Compatible High Definition Television", by C. G. Eilers et al., IEEE Transactions on Broadcasting, vol. 36, No. 1, Mar. 1990.
"High Definition And High Frame Rate Compatible N.T.S.C. Broadcast Television System", by G. W. Meeker, IEEE Transactions on Broadcasting, vol. 34, No. 3, Sep. 1988.
"An Extended Definition Television System Using Quadrature Modulation Of The Video Carrier With Inverse Nyquist Filter", by Y. Yasumoto et al., IEEE Transactions on Consumer Electronics, vol. CE-33, No. 3, Aug. 1987.
General Electric Company
Groody James J.
Harvey David E.
Herrmann Eric P.
Kurdyla Ronald H.
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