Testing of Television Transmission Channels with Vertical Interval Test Signals

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: The choice and use of test signals for in-service testing of video transmission facilities during the vertical interval (VITS) are based on several considerations. The sine-squared pulse, having a half-amplitude duration of 1/8 μs, often called a T pulse, is not a good choice for the quality rating of a television channel. Computed results from transmission response of actual facilities and echo-rating theory show that this signal may fail to detect poor channels and will on occasion indicate that a good channel is bad. The T pulse correlates poorly with the results of subjective tests. Alternative signals analyzed as to their spectrum and application include the 2T pulse, a step function having a controlled rise time and the 20T modulated pulse for evaluating the color-carrying capabilities of a channel. On the basis of results of measurements made on operating transmission systems the next steps are recommended in the development of an optimum set of vertical interval test signals.
Publication Date: 1968-08-01
DOI: 10.5594/J06983
Link: https://doi.org/10.5594/J06983
Author(s): R. E. Mallon, A. D. Williams

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R. E. Mallon and A. D. Williams; Testing of Television Transmission Channels with Vertical Interval Test Signals, Journal of the SMPTE ( Volume: 77, Issue: 8, August 1968); SMPTE, 1968. Available at https://doi.org/10.5594/J06983

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R. E. Mallon and A. D. Williams; Testing of Television Transmission Channels with Vertical Interval Test Signals, Journal of the SMPTE ( Volume: 77, Issue: 8, August 1968); SMPTE, 1968. Available at https://doi.org/10.5594/J06983

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<span class="citation">R. E. Mallon and A. D. Williams; <cite>Testing of Television Transmission Channels with Vertical Interval Test Signals</cite>, Journal of the SMPTE ( Volume: 77, Issue: 8, August 1968); SMPTE, 1968. Available at <a href="https://doi.org/10.5594/J06983" target="_blank" rel="noopener">https://doi.org/10.5594/J06983</a></span>

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<li>
R. E. Mallon and A. D. Williams; <cite id="bib-10-5594-j06983">Testing of Television Transmission Channels with Vertical Interval Test Signals</cite>, Journal of the SMPTE ( Volume: 77, Issue: 8, August 1968); SMPTE, 1968
<span class="doi">10.5594/J06983</span>
</li>