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Journal of the SMPTE ( Volume: 77, Issue: 8, August 1968)
[ACTIVE]

Testing of Television Transmission Channels with Vertical Interval Test Signals

Metadata

Publisher
SMPTE — White Plains, NY, USA
Doc Type
Journal Article
Content Type
Original Research
Abbreviated Title
J SMPTE
Volume
77, No. 8, pp. 789–793
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
ISSN
Print: 0361-4573
Link
https://doi.org/10.5594/J06983
Author(s)
R. E. MallonBell Telephone Laboratories, Holmdel, N.J. 07733
A. D. WilliamsBell Telephone Laboratories, Holmdel, N.J. 07733
Copyright
© 1968 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

  • Measurement of Television Picture Impairments Caused by Linear Distortions [Active]
  • Modification of the Pulse-and-Bar Test Signal with Special Reference to Application in Color Television [Active]
  • 1. Johannesen F. G. , “Recent developments and utilization of test signals in the vertical interval,” IEEE Trans. on Broadcasting , BC-13 : 6 – 14 , Jan. 1967 . EXTERNAL
  • 3. Israel J. O. , “The 9A Video Distortion Measuring Set,” Bell Laboratories Record , 42 : 121 – 123 , Apr. 1964 . EXTERNAL
  • 4. Barstow J. M. Christopher H. N. , “The measurement of random video interference to monochrome and color television pictures,” AIEE Trans. , 81 , Pt. I: 313 – 320 , Nov. 1962 . EXTERNAL
  • 5. Lewis N. W. , “Waveform responses of television links,” Proc. of IEE (London) , 101 , Pt. III: 258 – 270 , July 1959 . EXTERNAL
  • 6. CCIR Doc. XIth Plenary Assembly, Oslo, 1966 , Rec. 421–1. EXTERNAL
  • 8. Rosman G. , “Interpretation of the waveform of luminance-chrominance pulse signals,” Electronics Letters , 3 : 128 , Mar. 1967 . EXTERNAL
  • 9. Ingle J. F. Lebeyka J. J. , “Video amplitude and delay measuring set,” 1965 IEEE Convention Record , 13 , Pt. II: 262 – 268 . EXTERNAL
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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
Snippet:
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
Snippet:
<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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Preview:
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
doi: 10.5594/J06983
url: https://doi.org/10.5594/J06983
Snippet:
<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>

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