Combed Aperture Equalization for Color Television Cameras

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: The color and luminance frequency components of the standard NTSC signal are spaced so that band sharing is optimized by interference cancellation using frequency interleaving. The relationship between the color subcarrier and the line scanning rate is such that the chroma sidebands fall into spaces seldom used by the luminance signal. The two types of undesired luminance signals are: (1) low-visibility luminance components resulting from incomplete interference cancellation; and (2) luminance components that are very close in frequency to the chroma sidebands, causing beats or scintillating effects when viewed on the color receiver. This also applies to the noise that may be present with the luminance signal. The latter problem is the concern of this paper. Unselective aperture equalization can strengthen luminance frequency components and noise in the spectrum that coincide with chroma sidebands. By “combing” the aperture correcting signal, pictures may be enhanced by an amount previously considered impractical without increasing the edge beats or luminance-chroma heterodyning.
Publication Date: 1970-01-01
DOI: 10.5594/J16707
Link: https://doi.org/10.5594/J16707
Author(s): R. R. Brooks, W. J. Cosgrove

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R. R. Brooks and W. J. Cosgrove; Combed Aperture Equalization for Color Television Cameras, Journal of the SMPTE ( Volume: 79, Issue: 1, January 1970); SMPTE, 1970. Available at https://doi.org/10.5594/J16707

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R. R. Brooks and W. J. Cosgrove; Combed Aperture Equalization for Color Television Cameras, Journal of the SMPTE ( Volume: 79, Issue: 1, January 1970); SMPTE, 1970. Available at https://doi.org/10.5594/J16707

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<span class="citation">R. R. Brooks and W. J. Cosgrove; <cite>Combed Aperture Equalization for Color Television Cameras</cite>, Journal of the SMPTE ( Volume: 79, Issue: 1, January 1970); SMPTE, 1970. Available at <a href="https://doi.org/10.5594/J16707" target="_blank" rel="noopener">https://doi.org/10.5594/J16707</a></span>

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R. R. Brooks and W. J. Cosgrove; Combed Aperture Equalization for Color Television Cameras, Journal of the SMPTE ( Volume: 79, Issue: 1, January 1970); SMPTE, 1970
doi: 10.5594/J16707
url: https://doi.org/10.5594/J16707

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<li>
R. R. Brooks and W. J. Cosgrove; <cite id="bib-10-5594-j16707">Combed Aperture Equalization for Color Television Cameras</cite>, Journal of the SMPTE ( Volume: 79, Issue: 1, January 1970); SMPTE, 1970
<span class="doi">10.5594/J16707</span>
</li>