EDTV recording apparatus
AssigneeGeneral Electric Company
InventorsJames M. Walter, Krishnamurthy Jonnalagadda, Robert E. Flory
Life of this patent
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Abstract
Extended definition television (EDTV) signals including a compatible composite wideband signal and a separate helper or extended definition signal are combined, for example, for recording purposes, using frequency multiplexing techniques. The helper signal is applied to a modulator, which produces a suppressed carrier modulated signal, to frequency shift the helper signal to a spectral band above the frequency band occupied by the compatible composite wideband signal. The frequency shifted and wideband signal are then added to form the combined signal.
Claims11
Apparatus for recording an extended definition video signal comprising:
- a source of video signal;
- an extended definition television signal encoder coupled to said source and responsive to said video signal for generating a wideband video signal representing luminance and chrominance information;
- and generating a narrow band video signal representing differences between horizontal video signal lines which are separated in one of a spatial and temporal dimension;
- modulator means for frequency shifting said narrow band signal to produce a modulated signal occupying a frequency band above the frequency band occupied by said wideband signal;
- combining means, coupled to said modulator means and said encoder for combining said wideband signal and the frequency shifted narrow band signal to produce a combined signal;
- and
- means including composite video signal recording means coupled to said combining means for recording said combined signal.
A video signal processing system comprising:
- a source of video signal formatted in field/frames of horizontal lines of image information;
- encoder means coupled to said source and responsive to said video signal for generating a wideband and a further luminance signal, said wideband luminance signal being a baseband signal compatible with conventional broadcast standards, said further luminance signal representing signal differences between one of spatially and temporally adjacent horizontal lines of video signal occuping a frequency spectrum adjacent the frequency spectrum of the wideband luminance spectrum;
- and
- means including recording means for recording said wideband and further luminance signals.
A video signal processing system comprising:
- a source of extended definition television signals including a wideband composite video signal formatted in frame/fields of horizontal image lines, and a difference signal representing differences between signals from one of temporally and spatially adjacent image lines;
- a source of a carrier signal synchronized to the rate of occurrence of said horizontal image lines;
- suppressed carrier modulator means, responsive to said difference signal, for modulating said carrier to produce a frequency shifted difference signal occuping a frequency spectrum adjacent the frequency spectrum of the composite signal;
- signal summing means coupled to said modulator and said source of extended definition television signal for combining said wideband composite signal and said frequency shifted difference signal to produce a combined signal;
- and
- means for recording said combined signal.
Dependencies are inferred from the claim text.