A New Crispener Circuit for Television Images

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: The subjective definition of a television image may be improved by overemphasizing and/or increasing the steepness of its luminance transitions. A new crispener circuit capable of performing either or both these functions using linear circuitry is described and illustrated with low-resolution television images. It is shown that the effect of overemphasizing or steepening the rise-times of the luminance transitions appear to be comparable in improving the subjective quality of the resulting picture whereas a combination of the two is superior to either. Applications of the crispener circuit in outlining television images and reducing overshoot and ring due to sharp cutoff filter characteristics are also described and illustrated. It is shown that when the ring and overshoot in an image are reduced, the sharpness of the image is likewise reduced.
Publication Date: 1963-11-01
DOI: 10.5594/J15425
Link: https://doi.org/10.5594/J15425
Author(s): Earl F. Brown

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Earl F. Brown; A New Crispener Circuit for Television Images, Journal of the SMPTE ( Volume: 72, Issue: 11, November 1963); SMPTE, 1963. Available at https://doi.org/10.5594/J15425

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Earl F. Brown; A New Crispener Circuit for Television Images, Journal of the SMPTE ( Volume: 72, Issue: 11, November 1963); SMPTE, 1963. Available at https://doi.org/10.5594/J15425

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Earl F. Brown; A New Crispener Circuit for Television Images, Journal of the SMPTE ( Volume: 72, Issue: 11, November 1963); SMPTE, 1963. Available at https://doi.org/10.5594/J15425

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<span class="citation">Earl F. Brown; <cite>A New Crispener Circuit for Television Images</cite>, Journal of the SMPTE ( Volume: 72, Issue: 11, November 1963); SMPTE, 1963. Available at <a href="https://doi.org/10.5594/J15425" target="_blank" rel="noopener">https://doi.org/10.5594/J15425</a></span>

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Earl F. Brown; A New Crispener Circuit for Television Images, Journal of the SMPTE ( Volume: 72, Issue: 11, November 1963); SMPTE, 1963
doi: 10.5594/J15425
url: https://doi.org/10.5594/J15425

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<li>
Earl F. Brown; <cite id="bib-10-5594-j15425">A New Crispener Circuit for Television Images</cite>, Journal of the SMPTE ( Volume: 72, Issue: 11, November 1963); SMPTE, 1963
<span class="doi">10.5594/J15425</span>
</li>