Methods and Equipment Techniques for Multiline VITS Insertion in TV Relays

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPTE
Volume: 75, No. 2, pp. 89–93
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
ISSN: Print: 0361-4573
Link: https://doi.org/10.5594/J07727
Author(s): J. B. PotterElectrical Engineering Dept., University of Melbourne, Parkville, N.2, Melbourne, Australia
Copyright: © 1966 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

Vertical Interval Test Signals in Australian Television [Active]
2. Potter J. B. , “Pilot waveform insertion in television signals,” Proc. IRE (Aust.) , 24 : No. 9 , 685 , Sept. 1963 . EXTERNAL
3. C.C.I.R. Recommendation 420, Xth Plenary Assembly, Geneva, 1963 . EXTERNAL
4. Potter J. B. , “A pilot waveform insertion unit for use in the Australian TV network,” presented to IREE (Aust.), 1965 Radio and Electronics Engineering Convention, Canberra. To be published in Proc. IREE (Aust.). . EXTERNAL
5. Seyler A. J. , “Transistorized pulse and bar generator,” Proc. IRE (Aust.) , 24 : No. 3 , 321 , Mar. 1963 . EXTERNAL
6. “Standards for the technical equipment and operation of television stations,” Australian Broadcasting Central Board, Feb. 1958. Also in Vol. 5 of C.C.I.R. Green Book of the Xth Plenary Assembly, Geneva, 1963, Report No. 308. EXTERNAL
7. Potter J. B. , “A video gating system using a transistor as the active element,” Proc. IRE (Aust.) , 24 : No. 5 , 422 , May 1963 . EXTERNAL

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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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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>
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Referenced By

Television Vertical Interval Signals [Active]