Multigeneration Performance of a Digital Composite VTR

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPTE
Volume: 98, No. 10, pp. 732–737
Abstract: A composite DVTR designed to operate in an existing composite environment must provide distortion-free signals after many generations. In this article, the effect of each distortion is investigated, and methods are developed to minimize the cumulative effects of all analog distortions. The sampling process of the analog-to-digital (A/D) converter introduces quantizing noise that may become noticeable after many generations. The accuracy of the sampling phase for the A/D clock is also considered, as measurement error could accumulate and impair the quality of the picture. The RF channel, including the head-to-tape interface, is the source of noise that introduces errors in the digital data. Use of a powerful error-correction system can correct nearly all such errors. Operating environment is also considered. Satisfactory multi-generation performance of a composite DVTR can be achieved by keeping analog circuitry within the recorder to a minimum. With care, the remaining causes of distortion can be controlled to provide acceptable quality in a composite environment after many analog generations.
Publication Date: 1989-10-01
DOI: 10.5594/J02637
ISSN: Print: 0036-1682
Link: https://doi.org/10.5594/J02637
Author(s): Fraser MorrisonAmpex Corp., Redwood City, CA 94063
Copyright: © 1989 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1. Devereux V. G. , “Tests on 8 Video PCM Codecs in Tandem Handling Composite NTSC and Monochrome Video Signals,” BBC Research Dept. Report 1982 /19. EXTERNAL
2. Moore T. A. , “A Theoretical Assessment of the Quantising Noise Spectra Arising from a Change in the Sampling of NTSC Signals,” BBC Research Dept. Report 1976 /10. EXTERNAL
3. Salter M. T. Felix M. O. , “Improved Techniques for Measuring Phase and Gain in Digitised Signals.” J. of the RTS , 16 :, Nov./Dec., 1976 . EXTERNAL
4. Yeh N. H. , “Characteristics of Overwrite-Induced Bit Shift,” presented at Intermag Conference, Vancouver, BC. Canada, July 1988 . EXTERNAL
5. Morrison E. F. , “Tape Format for a PAL DVTR,” presented at 15th International Television Symposium, Montreux, Switzerland, June 1987 . EXTERNAL

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Fraser Morrison; Multigeneration Performance of a Digital Composite VTR, SMPTE Journal ( Volume: 98, Issue: 10, October 1989); SMPTE, 1989. Available at https://doi.org/10.5594/J02637

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Fraser Morrison; Multigeneration Performance of a Digital Composite VTR, SMPTE Journal ( Volume: 98, Issue: 10, October 1989); SMPTE, 1989. Available at https://doi.org/10.5594/J02637

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Fraser Morrison; Multigeneration Performance of a Digital Composite VTR, SMPTE Journal ( Volume: 98, Issue: 10, October 1989); SMPTE, 1989. Available at https://doi.org/10.5594/J02637

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<span class="citation">Fraser Morrison; <cite>Multigeneration Performance of a Digital Composite VTR</cite>, SMPTE Journal ( Volume: 98, Issue: 10, October 1989); SMPTE, 1989. Available at <a href="https://doi.org/10.5594/J02637" target="_blank" rel="noopener">https://doi.org/10.5594/J02637</a></span>

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Fraser Morrison; Multigeneration Performance of a Digital Composite VTR, SMPTE Journal ( Volume: 98, Issue: 10, October 1989); SMPTE, 1989
doi: 10.5594/J02637
url: https://doi.org/10.5594/J02637

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<li>
Fraser Morrison; <cite id="bib-10-5594-j02637">Multigeneration Performance of a Digital Composite VTR</cite>, SMPTE Journal ( Volume: 98, Issue: 10, October 1989); SMPTE, 1989
<span class="doi">10.5594/J02637</span>
</li>