Application of K-Rating to USA NTSC Systems

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: Waveform testing methods are commonly used to determine the performance of video channels.1,2 These testing methods use the distortion introduced by a channel on a specified test signal as a measure of channel performance. Results are presented of a study on using a 2 T pulse, a waveform that has received increased attention in the U.S. for the evaluation of linear distortion, and an oscilloscope graticule to interpret the pulse response in terms of K-rating for NTSC systems. The K-rating method specifies the performance of a channel in terms of a K-rating factor, which is given in per cent and represents a degree of subjective picture impairment equivalent to that occurring in a channel having a single well-displaced echo of K%. The recent study found that the use of a scaled 2 T pulse graticule on NTSC systems may result in K-ratings that are high by a factor of 1.8. A modified 2 T pulse K-rating graticule based on subjective test data using NTSC signals is presented that maintains the one-to-one correspondence between K-rating and picture impairment caused by a single echo.
Publication Date: 1970-01-01
DOI: 10.5594/J16706
Link: https://doi.org/10.5594/J16706
Author(s): Robert E. Mallon

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Robert E. Mallon; Application of K-Rating to USA NTSC Systems, Journal of the SMPTE ( Volume: 79, Issue: 1, January 1970); SMPTE, 1970. Available at https://doi.org/10.5594/J16706

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Robert E. Mallon; Application of K-Rating to USA NTSC Systems, Journal of the SMPTE ( Volume: 79, Issue: 1, January 1970); SMPTE, 1970. Available at https://doi.org/10.5594/J16706

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Robert E. Mallon; Application of K-Rating to USA NTSC Systems, Journal of the SMPTE ( Volume: 79, Issue: 1, January 1970); SMPTE, 1970. Available at https://doi.org/10.5594/J16706

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<span class="citation">Robert E. Mallon; <cite>Application of K-Rating to USA NTSC Systems</cite>, Journal of the SMPTE ( Volume: 79, Issue: 1, January 1970); SMPTE, 1970. Available at <a href="https://doi.org/10.5594/J16706" target="_blank" rel="noopener">https://doi.org/10.5594/J16706</a></span>

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Robert E. Mallon; Application of K-Rating to USA NTSC Systems, Journal of the SMPTE ( Volume: 79, Issue: 1, January 1970); SMPTE, 1970
doi: 10.5594/J16706
url: https://doi.org/10.5594/J16706

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<li>
Robert E. Mallon; <cite id="bib-10-5594-j16706">Application of K-Rating to USA NTSC Systems</cite>, Journal of the SMPTE ( Volume: 79, Issue: 1, January 1970); SMPTE, 1970
<span class="doi">10.5594/J16706</span>
</li>