Digital video quantizer
First Claim
1. An apparatus for quantizing and analyzing a digitized video signal, comprising:
- (a) a plurality of delay means for delaying the digitized video signal and produce a plurality of delayed digitized signals;
(b) first comparator means for comparing one of said delayed digitized signals to a video threshold to produce a quantized video signal; and
(c) slope detection means for detecting a slope of the digitized video signal which exceeds a predetermined slope threshold.
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Abstract
A digital video quantizer for use in TCAS and ATCRBS/SIF systems. A digital delay receives a digitized video signal and produces a plurality of delayed digital signals which are used throughout the quantizer. A threshold generator then produces a predetermined threshold and a dynamic threshold, and a quantized video generator compares one of the delayed digitized signals to a threshold to produce a quantized video signal. A slope quantizer detects a slope of the digitized signal which exceeds either a positive or negative threshold. In addition, a rise time detector detects an excessive rise time in the digitized video signal, and a chip amplitude comparator provides a signal which is used in detecting Mode S data bit values. The digital video quantizer'"'"'s use of digital references rather than analog references, eliminates the inaccuracies caused by a reference voltage varying over time or temperature. The digital references also facilitate modification of the reference values at a later time.
29 Citations
19 Claims
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1. An apparatus for quantizing and analyzing a digitized video signal, comprising:
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(a) a plurality of delay means for delaying the digitized video signal and produce a plurality of delayed digitized signals; (b) first comparator means for comparing one of said delayed digitized signals to a video threshold to produce a quantized video signal; and (c) slope detection means for detecting a slope of the digitized video signal which exceeds a predetermined slope threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for quantizing and analyzing a digitized video signal, comprising:
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(a) a plurality of delay means for delaying the digitized video signal to produce a plurality of delayed digitized signals; (b) first comparator means for comparing one of said digitized signals and a video threshold to produce a quantized video signal; (c) threshold selection means for selecting between a predetermined video threshold and a dynamic video threshold to produce said video threshold; and (d) dynamic video threshold generation means for generating said dynamic video threshold, said dynamic video threshold generation means having sampling means for storing a sample of one of said delayed digitized signals, and first adder means for taking a difference between said sample and a first predetermined value. - View Dependent Claims (12, 13, 14, 15, 16)
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17. An apparatus for quantizing and analyzing a digitized video signal, comprising:
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(a) a plurality of delay means for delaying the digitized video signal to produce a plurality of delayed digitized signals; (b) first comparator means for comparing one of said delayed digitized signals and a video threshold to produce a quantized video signal; (c) threshold selection means for selecting between a predetermined video threshold and a dynamic video threshold to produce said video threshold; (d) slope detection means for detecting a slope of the digitized video signal which exceeds a predetermined slope threshold; and (e) rise time detection means for detecting a rise time of the digitized video signal which exceeds a predetermined rise time value.
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18. A method of quantizing and analyzing a digitized video signal, comprising the steps of:
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(a) delaying the digitized video signal to produce a plurality of delayed digitized signals; (b) comparing one of said delayed digitized signals and a video threshold to produce a quantized video signal; (c) detecting a slope of the digitized video signal which exceeds a predetermined slope threshold; and (d) selecting between a predetermined video threshold and a dynamic video threshold to produce said video threshold. - View Dependent Claims (19)
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Specification