A Novel Television Add-On Data Communication System

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: A system for adding an auxiliary data channel to a standard NTSC television signal has been developed by taking advantage of the fact that for most scenes video voltage levels are very low in 2.5-MHz region. No use is made of the vertical or horizontal blanking intervals. A low-amplitude subcarrier is inserted at an odd multiple of one-half the line-scanning frequency after being biphase-modulated by a specially clocked data stream. The signal is essentially invisible on a standard receiver but when processed by an add-on decoder the original information modulated on the signal may be recovered and displayed on the receiver screen. A 21-kb/s data rate has been obtained with acceptable error rates. Applications of the add-on data communication system include: multilanguage subtitles, subtitles for the deaf, network communications and teaching aids.
Publication Date: 1974-01-01
DOI: 10.5594/J07616
Link: https://doi.org/10.5594/J07616
Author(s): Patrick T. King

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Patrick T. King; A Novel Television Add-On Data Communication System, Journal of the SMPTE ( Volume: 83, Issue: 1, January 1974); SMPTE, 1974. Available at https://doi.org/10.5594/J07616

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Patrick T. King; A Novel Television Add-On Data Communication System, Journal of the SMPTE ( Volume: 83, Issue: 1, January 1974); SMPTE, 1974. Available at https://doi.org/10.5594/J07616

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Patrick T. King; A Novel Television Add-On Data Communication System, Journal of the SMPTE ( Volume: 83, Issue: 1, January 1974); SMPTE, 1974. Available at https://doi.org/10.5594/J07616

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<span class="citation">Patrick T. King; <cite>A Novel Television Add-On Data Communication System</cite>, Journal of the SMPTE ( Volume: 83, Issue: 1, January 1974); SMPTE, 1974. Available at <a href="https://doi.org/10.5594/J07616" target="_blank" rel="noopener">https://doi.org/10.5594/J07616</a></span>

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Patrick T. King; A Novel Television Add-On Data Communication System, Journal of the SMPTE ( Volume: 83, Issue: 1, January 1974); SMPTE, 1974
doi: 10.5594/J07616
url: https://doi.org/10.5594/J07616

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Patrick T. King; <cite id="bib-10-5594-j07616">A Novel Television Add-On Data Communication System</cite>, Journal of the SMPTE ( Volume: 83, Issue: 1, January 1974); SMPTE, 1974
<span class="doi">10.5594/J07616</span>
</li>