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Extended-definition-widescreen-television-signal-processing-system-with-alternate-subcarrier

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Details

Inventors: Isnardi, Michael A.;
Assignee: General Electric Company (Princeton, NJ)
Primary Examiner: Shepperd; John W.
Assistant Examiner:
Attorney, Agent or Firm: Tripoli; Joseph S., Herrmann; Eric P., Kurdyla; Ronald H.

An NTSC compatible widescreen EDTV system encodes and decodes a television signal comprising: (1) a main, standard format NTSC signal component with low frequency side panel image information compressed into the overscan regions thereof; (2) a time expanded high frequency side panel image information component; and (3) an extended high frequency horizontal luminance image information component. Components (2) and (3) modulate an alternate subcarrier which exhibits a frequency other than the frequency of a chrominance subcarrier within a band of frequencies occupied by chrominance image information.

DETAILED DESCRIPTION What is claimed is: 1.
In a system for processing a television-type signal representative of a widescreen image having a main component and a widescreen component containing spatially uncorrelated information relative to said main component, an image aspect ratio greater than that of a standard television image, and a chrominance subcarrier modulated with chrominance image information; apparatus comprising: means for providing uncorrelated auxiliary image information derived from said widescreen component; means for providing an alternate subcarrier in addition to said chrominance subcarrier; and means for modulating said alternate subcarrier with said derived uncorrelated auxiliary image information, wherein said alternate subcarrier exhibits a frequency within a band of baseband frequencies normally occupied by chrominance image information.
2.
A system according to claim 1, wherein said auxiliary modulating information is side panel information.
3.
A system according to claim 1, wherein said auxiliary modulating information is high frequency side panel information substantially exclusive of low frequency information.
4.
A system according to claim 1, wherein said alternate subcarrier exhibits an alternating phase unlike the phase of said chrominance subcarrier, and a frequency other than the frequency of said chrominance subcarrier.
5.
A system for receiving a television-type signal representative of a widescreen image having a main component and a widescreen component containing spatially uncorrelated information relative to said main component, an image aspect ratio greater than that of a standard television image, a chrominance subcarrier modulated with chrominance image information, and an alternate subcarrier in addition to said chrominance subcarrier, modulated by uncorrelated auxiliary image information derived from said widescreen component; said system comprising: demodulating means for receiving said television-type signal including said modulated alternate subcarrier, for demodulating said modulated alternate subcarrier to recover said modulating information; said alternate subcarrier exhibiting a frequency within a band of frequencies normally occupied by chrominance image information; and video signal processing means responsive to said recovered modulating information for producing an image representative signal

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