Interstitial line generator

Claim 2

Video signal processing apparatus for increasing the number of raster scan lines of a displayed image including an interstitial line generator comprising: a video signal input terminal (50); means (52,54,56) coupled to said input terminal for producing a plurality of relatively delayed signals representing horizontal lines disposed temporally and spatially about the location of an interstitial line; means (58,60,62,64,66,70) responsive to said plurality of relatively delayed signals for excluding the relatively positive and relatively negative extremes of said plurality of relatively delayed signals; and means (68) for combining the remaining of said relatively delayed signals in predetermined proportions to generate said interstitial line of signal.

Claim 3

The apparatus set forth in Claim 1 wherein the means for providing a plurality of relatively delayed signals includes: first and second delay elements, each providing a delay of 262 horizontal line intervals; a third delay element providing a delay of one horizontal line interval; and means for cascade coupling said first delay element, said third delay element and said second delay element in the order recited, and wherein said plurality of relatively delayed signals are provided at an input terminal of said first delay element and at respective output terminals of said first, second and third delay elements.

Claim 4

The apparatus set forth in Claim 2 wherein the means for excluding the relatively positive and relatively negative extremes comprises: first and second means having respective first input connections coupled to the input terminal of said first delay element and respective second input connections coupled to the output terminal of said second delay element, said first and second means for passing respectively the larger and smaller of two signals applied to their respective first and second input connections; third and fourth means having respective first input connections coupled to the output terminal of said first delay element and having respective second input connections coupled to the output terminal of said third delay element, said third and fourth means for passing respectively the larger and smaller of two signals applied to their respective first and second input connections; fifth means, coupled to said first and third means, for passing the smaller of two signals passed thereby; sixth means, coupled to said second and fourth means, for passing the larger of two signals passed thereby; said fifth means excluding said relatively positive extremes and said sixth means excluding said relatively negative extremes.

Claim 5

An interlace to non-interlace scan converter including an interstitial line generator comprising: an interlace scan video signal input terminal (IN); means (400) responsive to said input interlace scan video signal for providing a plurality of relatively delayed video signals representing video signals from a plurality of field intervals; first means (410,411,420), responsive to a first subset of said plurality of relatively delayed video signals for excluding the relative extremes thereof and passing at least a first signal representing at least one of said relatively delayed video signals from said first subset; second means (412,413,420), responsive to a second subset of said plurality of relatively delayed video signals for excluding the relative extremes thereof and passing at least a second signal representing at least one of said relatively delayed video signals of said second subset; third means (414,424,426,428), responsive to a third subset of said plurality of relatively delayed signals, said at least first signal and said at least second signal, for excluding the relative extremes thereof and for combining (430) the remaining signals of said third subset, said at least first signal and said at least second signal in predetermined proportions to generate said interstitial line.

Claim 6

An interlace to non-interlace scan converter including an interstitial line generator comprising: an interlace scan video signal input terminal (IN); means (400) responsive to said input interlace scan video signal for providing a plurality of relatively delayed video signals representing video signals from a plurality of field intervals; first means (410,411,420), responsive to a first subset of said plurality of relatively delayed video signals for excluding the relative extremes thereof and passing at least a first signal representing at least one of said relatively delayed video signals from said first subset; second means (412,413,420), responsive to a second subset of said plurality of relatively delayed video signals for excluding the relative extremes thereof and passing at least a second signal representing at least one of said relatively delayed video signals of said second subset; third means (414,424,426,428), responsive to a third subset of said plurality of relatively delayed signals, said at least first signal and said at least second signal, for excluding the relative extremes thereof and for combining (430) the remaining signals of said third subset, said at least first signal and said at least second signal in predetermined proportions to generate said interstitial line.