A Simplified Television Color Encoder

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: A simplified NTSC-compatible encoder produces a signal which is subjectively equivalent to that of a full broadcast encoder but is simplified to the point of requiring only one 6- by 8-in. printed circuit card. The red, green and blue (R, G, B) signals are matrixed into the R–Y and B–Y chrominance signals. The bandwidths of both signal paths are identical, thereby eliminating the need for an additional video-delay line. Moreover, the burst-flag signal is added negatively to the B–Y signal before band limiting; therefore, no special delay is needed for the burst flag. The R–Y and B Y signals are modulated in balanced fashion with the color subcarrier 90° out of phase. The subcarrier is generated internally by a crystal oscillator. An external subcarrier from a crystal-controlled source can also be used. To create the Y signal, the R, G, B signals are matrixed in the normal manner after which the “combined” signal is amplified and inverted. The inverted Y signal is added directly to both the R and B signals simultaneously in correct proportions, thereby creating the R-Y and B-Y chrominance signals. A separate luminance channel has also been incorporated; this enables a separately derived luminance signal to be used directly as the Y signal. The output of the encoder is a composite color video signal completely compatible with receivers designed for the NTSC signal.
Publication Date: 1968-09-01
DOI: 10.5594/J16731
Link: https://doi.org/10.5594/J16731
Author(s): Csaba Koblos

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Csaba Koblos; A Simplified Television Color Encoder, Journal of the SMPTE ( Volume: 77, Issue: 9, September 1968); SMPTE, 1968. Available at https://doi.org/10.5594/J16731

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Csaba Koblos; A Simplified Television Color Encoder, Journal of the SMPTE ( Volume: 77, Issue: 9, September 1968); SMPTE, 1968. Available at https://doi.org/10.5594/J16731

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Csaba Koblos; A Simplified Television Color Encoder, Journal of the SMPTE ( Volume: 77, Issue: 9, September 1968); SMPTE, 1968. Available at https://doi.org/10.5594/J16731

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<span class="citation">Csaba Koblos; <cite>A Simplified Television Color Encoder</cite>, Journal of the SMPTE ( Volume: 77, Issue: 9, September 1968); SMPTE, 1968. Available at <a href="https://doi.org/10.5594/J16731" target="_blank" rel="noopener">https://doi.org/10.5594/J16731</a></span>

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Csaba Koblos; A Simplified Television Color Encoder, Journal of the SMPTE ( Volume: 77, Issue: 9, September 1968); SMPTE, 1968
doi: 10.5594/J16731
url: https://doi.org/10.5594/J16731

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<li>
Csaba Koblos; <cite id="bib-10-5594-j16731">A Simplified Television Color Encoder</cite>, Journal of the SMPTE ( Volume: 77, Issue: 9, September 1968); SMPTE, 1968
<span class="doi">10.5594/J16731</span>
</li>