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Journal of the SMPTE ( Volume: 81, Issue: 12, December 1972)
[ACTIVE]

The Subjective Effects of Echoes in 525-Line Monochrome and NTSC Color Television and the Resulting Echo Time Weighting

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
Abstract
The subjective effect of an echo in a television picture depends not only upon the amplitude of the echo but also upon its time displacement from the main signal. The relationship between amplitude and time displacement, in the form of an echo time weighting curve, has been used as the basis for designing oscilloscope graticules used in waveform testing methods. A series of subjective tests was performed to evaluate the effects of echoes on 525-line monochrome and NTSC color pictures. Observers used a seven-point comment scale, ranging from “not perceptible” to “extremely objectionable” to rate the echo impairments. The test results show that separate positive and negative echo time weighting curves are indicated for monochrome signals and that a third curve, applicable to both positive and negative echoes, is indicated for color signals.
Publication Date
1972-12-01
DOI
10.5594/J08180
Link
https://doi.org/10.5594/J08180
Author(s)
A. M. Lessman
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A. M. Lessman; The Subjective Effects of Echoes in 525-Line Monochrome and NTSC Color Television and the Resulting Echo Time Weighting, Journal of the SMPTE ( Volume: 81, Issue: 12, December 1972); SMPTE, 1972. Available at https://doi.org/10.5594/J08180
Snippet:
A. M. Lessman; The Subjective Effects of Echoes in 525-Line Monochrome and NTSC Color Television and the Resulting Echo Time Weighting, Journal of the SMPTE ( Volume: 81, Issue: 12, December 1972); SMPTE, 1972. Available at https://doi.org/10.5594/J08180

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A. M. Lessman; The Subjective Effects of Echoes in 525-Line Monochrome and NTSC Color Television and the Resulting Echo Time Weighting, Journal of the SMPTE ( Volume: 81, Issue: 12, December 1972); SMPTE, 1972. Available at https://doi.org/10.5594/J08180
Snippet:
<span class="citation">A. M. Lessman; <cite>The Subjective Effects of Echoes in 525-Line Monochrome and NTSC Color Television and the Resulting Echo Time Weighting</cite>, Journal of the SMPTE ( Volume: 81, Issue: 12, December 1972); SMPTE, 1972. Available at <a href="https://doi.org/10.5594/J08180" target="_blank" rel="noopener">https://doi.org/10.5594/J08180</a></span>

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Preview:
A. M. Lessman; The Subjective Effects of Echoes in 525-Line Monochrome and NTSC Color Television and the Resulting Echo Time Weighting, Journal of the SMPTE ( Volume: 81, Issue: 12, December 1972); SMPTE, 1972
doi: 10.5594/J08180
url: https://doi.org/10.5594/J08180
Snippet:
<li>
A. M. Lessman; <cite id="bib-10-5594-j08180">The Subjective Effects of Echoes in 525-Line Monochrome and NTSC Color Television and the Resulting Echo Time Weighting</cite>, Journal of the SMPTE ( Volume: 81, Issue: 12, December 1972); SMPTE, 1972
<span class="doi">10.5594/J08180</span>
</li>