System Coding Parameters, Mechanics and Electromechanics of the Reflective Videodisc Player

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: The choice of a coding system for an optical videodisc system is determined by the recording process, the optical stylus, the associated servo systems, and the disc properties. The videodisc system described employs a master disc that is prepared by modulating a laser beam with video and audio information to expose a photosensitive surface on the disc; after processing, minute pits of varying length are produced in a spiral pattern on the disc — rather like the continuous pattern of an ordinary phonograph record but without grooves. Pressing copies from the master also follows the phonograph record analogy. The pit side of a disc is covered with a highly reflective metallic coating and an additional protective coating; the video and audio information is read by a focused laser beam from the other side of the disc, through the transparent material of the disc. The control mechanisms necessary for operation are discussed, and it is shown that a 30-min high-quality television program with two separate sound channels can be compressed to a 30-cm-diameter disc format while allowing adequate tolerances for all aspects of the signal processing.
Publication Date: 1977-02-01
DOI: 10.5594/J13239
Link: https://doi.org/10.5594/J13239
Author(s): P. W. Bögels

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P. W. Bögels; System Coding Parameters, Mechanics and Electromechanics of the Reflective Videodisc Player, SMPTE Journal ( Volume: 86, Issue: 2, February 1977); SMPTE, 1977. Available at https://doi.org/10.5594/J13239

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P. W. Bögels; System Coding Parameters, Mechanics and Electromechanics of the Reflective Videodisc Player, SMPTE Journal ( Volume: 86, Issue: 2, February 1977); SMPTE, 1977. Available at https://doi.org/10.5594/J13239

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<span class="citation">P. W. Bögels; <cite>System Coding Parameters, Mechanics and Electromechanics of the Reflective Videodisc Player</cite>, SMPTE Journal ( Volume: 86, Issue: 2, February 1977); SMPTE, 1977. Available at <a href="https://doi.org/10.5594/J13239" target="_blank" rel="noopener">https://doi.org/10.5594/J13239</a></span>

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P. W. Bögels; System Coding Parameters, Mechanics and Electromechanics of the Reflective Videodisc Player, SMPTE Journal ( Volume: 86, Issue: 2, February 1977); SMPTE, 1977
doi: 10.5594/J13239
url: https://doi.org/10.5594/J13239

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<li>
P. W. Bögels; <cite id="bib-10-5594-j13239">System Coding Parameters, Mechanics and Electromechanics of the Reflective Videodisc Player</cite>, SMPTE Journal ( Volume: 86, Issue: 2, February 1977); SMPTE, 1977
<span class="doi">10.5594/J13239</span>
</li>