Digital Video Recording in the 625-Line System

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPTE
Volume: 90, No. 2, pp. 113–115
Abstract: Multiple generation copies of videotape recordings are, even today, still subject to considerable reductions in quality. At the present time, it is difficult to foresee any progress being made in the tape, head, and amplifier fields which will bring about any noticeable improvement, as long as the analog FM recording method is retained. On the other hand, recording with digitized video signals would bring definite improvements without incurring any basic disadvantages such as increased tape consumption. The quality of copies (generations) would, with the exception of dropouts, no longer be influenced by the machine. At the moment, tape recorders with rotating head arrangements offer the highest storage density by far and, for this reason, are particularly suitable for digital video recording. Wavelengths of approximately 1 μm, using a corresponding code of 2 bits/μm, can be read with certainty. A track width of 40 μm yields a S/N ratio better than 26 dB and a corresponding BER (bit error rate) of about 10-6. Including safety margins, a recording density of 3 Mbit/cm2 can be achieved. Assuming that a future European digital video system will use a data rate of approximately 160 Mbit/s, a transport velocity of about 24 cm/s is required when 1-in tape is employed. A tape speed close to 24 cm/s is customary for the present generation of helical-scan machines in the 625-line system, recording analog signals.
Publication Date: 1981-02-01
DOI: 10.5594/J01501
ISSN: Print: 0036-1682
Link: https://doi.org/10.5594/J01501
Author(s): Hubert Foerster
Josef Sochor
Copyright: © 1981 Society of Motion Picture and Television Engineers, Inc.

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Hubert Foerster and Josef Sochor; Digital Video Recording in the 625-Line System, SMPTE Journal ( Volume: 90, Issue: 2, February 1981); SMPTE, 1981. Available at https://doi.org/10.5594/J01501

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Hubert Foerster and Josef Sochor; Digital Video Recording in the 625-Line System, SMPTE Journal ( Volume: 90, Issue: 2, February 1981); SMPTE, 1981. Available at https://doi.org/10.5594/J01501

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Hubert Foerster and Josef Sochor; Digital Video Recording in the 625-Line System, SMPTE Journal ( Volume: 90, Issue: 2, February 1981); SMPTE, 1981. Available at https://doi.org/10.5594/J01501

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<span class="citation">Hubert Foerster and Josef Sochor; <cite>Digital Video Recording in the 625-Line System</cite>, SMPTE Journal ( Volume: 90, Issue: 2, February 1981); SMPTE, 1981. Available at <a href="https://doi.org/10.5594/J01501" target="_blank" rel="noopener">https://doi.org/10.5594/J01501</a></span>

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Hubert Foerster and Josef Sochor; Digital Video Recording in the 625-Line System, SMPTE Journal ( Volume: 90, Issue: 2, February 1981); SMPTE, 1981
doi: 10.5594/J01501
url: https://doi.org/10.5594/J01501

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<li>
Hubert Foerster and Josef Sochor; <cite id="bib-10-5594-j01501">Digital Video Recording in the 625-Line System</cite>, SMPTE Journal ( Volume: 90, Issue: 2, February 1981); SMPTE, 1981
<span class="doi">10.5594/J01501</span>
</li>