Method and apparatus for video standard conversion
First Claim
Patent Images
1. A method for converting an input video signal having a first scan line rate to an output video signal having a second scan line rate, said method comprising the steps of:
- generating a plurality of carrier frequencies, each carrier-frequency being associated with at least one scan line segment of said input video signal;
modulating each of said carrier frequencies with video information corresponding to said least one scan line segment of said input video signal;
holding substantially constant the modulation of each said carrier frequency between successive scan lines of said input video signal;
sampling at least some of said carrier frequencies in a sequence so as to derive a video output signal modulated with a sequence of carrier frequency modulation samples, said video output signal derived for each sampling sequence representing one decoded scan line;
repeating said sampling sequence at a rate related to the desired scan line rate of the output video signal.
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Abstract
A video signal having a given line scan rate is converted to a different line scan rate by analog encoding such that each scan line is divided into a finite number of picture elements and video information corresponding to each picture element is modulated onto one of a series of carrier frequencies for transmission in parallel form. An inexpensive decoder scans the encoded video signal to reconstruct an output video signal having a line scan rate related to the rate of repetition of the encoded video signal scanning cycle.
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Citations
52 Claims
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1. A method for converting an input video signal having a first scan line rate to an output video signal having a second scan line rate, said method comprising the steps of:
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generating a plurality of carrier frequencies, each carrier-frequency being associated with at least one scan line segment of said input video signal; modulating each of said carrier frequencies with video information corresponding to said least one scan line segment of said input video signal; holding substantially constant the modulation of each said carrier frequency between successive scan lines of said input video signal; sampling at least some of said carrier frequencies in a sequence so as to derive a video output signal modulated with a sequence of carrier frequency modulation samples, said video output signal derived for each sampling sequence representing one decoded scan line; repeating said sampling sequence at a rate related to the desired scan line rate of the output video signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. Apparatus for converting an input video signal having a first scan line rate to an output video signal having a second scan line rate comprising:
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means for generating a plurality of carrier frequencies; means for modulating each said carrier frequency with video information related to one or more corresponding scan line segments of said video input signal such that the segments constituting each scan line of said input signal are carried in parallel by said carrier frequencies; means for holding substantially constant the modulation of each said carrier frequency between successive scan lines of said input video signal; and means for sampling at least some of said carrier frequencies in a repeating sequence, each said sampling sequence driving an output video signal modulated with a sequence of carrier-frequency modulation samples, said video output signal derived for each said sampling sequence representing one decoded scan line, the scan line rate of the decoded signal being related to the rate of repetition of said sampling sequence. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. Apparatus for encoding an input video signal having a first scan line rate into a format suitable for decoding at a second scan line rate, comprising:
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means for generating a plurality of carrier frequencies; means for modulating each said carrier frequency with video information relaated to one or more corresponding scan line segments of said video input signal such that the segments constituting each scan line of said input signal are carried in parallel by said carrier frequencies; and means for holding substantially constant the modulation of each said carrier frequency between successive scan lines of said input video signal. - View Dependent Claims (43)
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44. Apparatus for decoding a video signal encoded by modulating each of a plurality of carrier frequencies with video information corresponding to one or more segments of an input video signal, comprising:
means for sampling at least some of said carrier frequencies in a repeating sequence, said means for sampling comprising sweep oscillator means and mixer means for heterodyning said carrier frequencies with the output of said sweep oscillator means, each said sampling sequence deriving an output video signal modulated with a sequence of carrier-frequency modulation samples, said video output signal derived for each said sampling sequence representing one decoded scan line, the decoded video signal having a scan line rate related to the rate of repetition of said sampling sequence. - View Dependent Claims (45, 46, 47, 48, 49, 50)
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51. A method for encoding an input video signal having a first scan line rate into a format suitable for decoding at a second line scan rate said method comprising the steps of:
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generating a plurality of carrier frequencies, each carrier frequency being associated with at least one scan line segment of said input video signal; and modulating each of said carrier frequencies with video information corresponding to said least one scan line segment of said input video signal; and holding substantially constant the modulation of each said carrier frequency between successive scan lines of said input video signal.
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52. A method for converting an input video signal having a first frame rate to an output video signal having a second frame rate said method comprising:
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generating a plurality of carrier frequencies; dividing each frame of said input video signal into a finite number of picture elements; modulating each said carrier frequency with video information corresponding to at least one of said picture elements; sampling at least some of said carrier frequencies in a sequence to derive an output video signal modulated by a sequence of carrier-frequency modulation samples, each sample representing one picture element and each sampling sequence deriving an output video signal representing one video frame; and repeating said sampling sequence at a rate related to the desired frame rate of said output video signal.
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Specification