Methods and Equipment Techniques for Multiline VITS Insertion in TV Relays

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: Vertical interval test signal (VITS) insertion has now become a widely adopted means of on-line testing and monitoring of TV signal transmissions. In a network of relay links interconnecting a number of different user organizations, different functions of VITS must be provided, depending on the user and purpose of the inserted signals. To provide the required flexibility of operation, a VITS insertion unit has been developed by means of which up to eight different test signals may be inserted and/or replaced. To accommodate varying operational requirements, the insertion line switching sequence is controlled by digital insertion program logic, prewired on a plug-in card which may readily be exchanged. Integrated with the equipment is a sampled automatic gain control system which uses an inserted level reference waveform to provide the level adjustment criterion. Synchronizing and blanking signal regeneration is also provided, but on a substantially line-by-line basis, thus allowing a number of VITS insertion units to be operated in cascade. To protect the TV signal transmission from being interrupted by a malfunction of the insertion unit, an extensive fault testing routine is built into the VITS unit. In the event of equipment failure, an automatic bridging of the insertion unit by electromechanical switches takes place.
Publication Date: 1966-02-01
DOI: 10.5594/J07727
Link: https://doi.org/10.5594/J07727
Author(s): J. B. Potter

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J. B. Potter; Methods and Equipment Techniques for Multiline VITS Insertion in TV Relays, Journal of the SMPTE ( Volume: 75, Issue: 2, February 1966); SMPTE, 1966. Available at https://doi.org/10.5594/J07727

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J. B. Potter; Methods and Equipment Techniques for Multiline VITS Insertion in TV Relays, Journal of the SMPTE ( Volume: 75, Issue: 2, February 1966); SMPTE, 1966. Available at https://doi.org/10.5594/J07727

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<span class="citation">J. B. Potter; <cite>Methods and Equipment Techniques for Multiline VITS Insertion in TV Relays</cite>, Journal of the SMPTE ( Volume: 75, Issue: 2, February 1966); SMPTE, 1966. Available at <a href="https://doi.org/10.5594/J07727" target="_blank" rel="noopener">https://doi.org/10.5594/J07727</a></span>

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J. B. Potter; Methods and Equipment Techniques for Multiline VITS Insertion in TV Relays, Journal of the SMPTE ( Volume: 75, Issue: 2, February 1966); SMPTE, 1966
doi: 10.5594/J07727
url: https://doi.org/10.5594/J07727

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<li>
J. B. Potter; <cite id="bib-10-5594-j07727">Methods and Equipment Techniques for Multiline VITS Insertion in TV Relays</cite>, Journal of the SMPTE ( Volume: 75, Issue: 2, February 1966); SMPTE, 1966
<span class="doi">10.5594/J07727</span>
</li>