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Journal of the SMPTE ( Volume: 83, Issue: 7, July 1974)
[ACTIVE]

An Experimental Optical Videodisc Playback System

Metadata

Publisher
SMPTE — White Plains, NY, USA
Doc Type
Journal Article
Content Type
Original Research
Abbreviated Title
J SMPTE
Volume
83, No. 7, pp. 580–582
Abstract
An experimental videodisc playback system has been developed using a thin flexible transparent plastic disc as the information carrying medium. The information is read out by transmitting HeNe laser light through the disc. Information is stored on the disc in the form of pitted tracks or hill-and-dale modulated grooves. The player has a simple optical path and servo system. A magnetically driven two-axis mirror controls the light beam independently in the radial and tangential directions, providing excellent radial tracking and time-base correction. Vertical focusing of the light beam is maintained by aerodynamic stabilization of the disc. A high-frequency carrier is frequency modulated with the chroma and luminance information. Luminance bandwidth is equal to that normally used in NTSC receivers. Tentatively, the sound has been put on its own FM carrier at a low frequency. A transcoder converts the disc signal into an NTSC signal on a VHF carrier. Because the disc is transmissive, both sides can be played without crosstalk merely by adjusting the focal plane of the laser light spot; the disc itself need not be repositioned. Track spacings as close as 9,000 tracks/cm (0.39 in), corresponding to a playing time of 4 min 43 s/cm, have been achieved experimentally with acceptable crosstalk between tracks.
Publication Date
1974-07-01
DOI
10.5594/J10637
ISSN
Print: 0361-4573
Link
https://doi.org/10.5594/J10637
Author(s)
George W. HrbekZenith Radio Corp., 6001 W. Dickens Ave., Chicago, IL 60639.
Copyright
© 1974 Society of Motion Picture and Television Engineers, Inc.
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George W. Hrbek; An Experimental Optical Videodisc Playback System, Journal of the SMPTE ( Volume: 83, Issue: 7, July 1974); SMPTE, 1974. Available at https://doi.org/10.5594/J10637
Snippet:
George W. Hrbek; An Experimental Optical Videodisc Playback System, Journal of the SMPTE ( Volume: 83, Issue: 7, July 1974); SMPTE, 1974. Available at https://doi.org/10.5594/J10637

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George W. Hrbek; An Experimental Optical Videodisc Playback System, Journal of the SMPTE ( Volume: 83, Issue: 7, July 1974); SMPTE, 1974. Available at https://doi.org/10.5594/J10637
Snippet:
<span class="citation">George W. Hrbek; <cite>An Experimental Optical Videodisc Playback System</cite>, Journal of the SMPTE ( Volume: 83, Issue: 7, July 1974); SMPTE, 1974. Available at <a href="https://doi.org/10.5594/J10637" target="_blank" rel="noopener">https://doi.org/10.5594/J10637</a></span>

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Preview:
George W. Hrbek; An Experimental Optical Videodisc Playback System, Journal of the SMPTE ( Volume: 83, Issue: 7, July 1974); SMPTE, 1974
doi: 10.5594/J10637
url: https://doi.org/10.5594/J10637
Snippet:
<li>
George W. Hrbek; <cite id="bib-10-5594-j10637">An Experimental Optical Videodisc Playback System</cite>, Journal of the SMPTE ( Volume: 83, Issue: 7, July 1974); SMPTE, 1974
<span class="doi">10.5594/J10637</span>
</li>

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