Journal of the Society of Motion Picture and Television Engineers ( Volume: 57, Issue: 4, October 1951)

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A System of Double Noise Reduction for Variable-Area Recording for Direct-Playback Purposes

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPTE
Volume: 57, No. 4, pp. 316–319
Abstract: In variable-area recordings made for direct-playback purposes, the density of the “opaque” part of the track is established by distortion criteria and is usually so low that the signal-to-noise ratio is adversely affected. A system of “double noise reduction” is proposed which does not require the use of auxiliary lamps, slits or galvanometers. By this means, not only is the clear area of the track reduced during periods of low modulation, but also the density of the exposed area of the track outside the modulation envelope is increased in order to reduce the noise contributed by this part of the track. Tests indicate that a reduction in noise of 3 to 4 db can be expected.
Publication Date: 1951-10-01
DOI: 10.5594/J06282
ISSN: Print: 0898-042X
Link: https://doi.org/10.5594/J06282
Author(s): J. G. StreiffertEastman Kodak Co., Rochester 4, N. Y.
Copyright: © 1951 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1. U.S. Patent 1,935,417, Lewis T. Robinson, 1933 . EXTERNAL
2. U.S. Patents 2,251,665, G. L. Dimmick, 1941 ; 2,165,787, G. L. Dimmick, 1939 . EXTERNAL
3. British Patent 546,332, Radio Corporation of America, 1942 . EXTERNAL

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J. G. Streiffert; A System of Double Noise Reduction for Variable-Area Recording for Direct-Playback Purposes, Journal of the Society of Motion Picture and Television Engineers ( Volume: 57, Issue: 4, October 1951); SMPTE, 1951. Available at https://doi.org/10.5594/J06282

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J. G. Streiffert; A System of Double Noise Reduction for Variable-Area Recording for Direct-Playback Purposes, Journal of the Society of Motion Picture and Television Engineers ( Volume: 57, Issue: 4, October 1951); SMPTE, 1951. Available at https://doi.org/10.5594/J06282

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<span class="citation">J. G. Streiffert; <cite>A System of Double Noise Reduction for Variable-Area Recording for Direct-Playback Purposes</cite>, Journal of the Society of Motion Picture and Television Engineers ( Volume: 57, Issue: 4, October 1951); SMPTE, 1951. Available at <a href="https://doi.org/10.5594/J06282" target="_blank" rel="noopener">https://doi.org/10.5594/J06282</a></span>

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<li>
J. G. Streiffert; <cite id="bib-10-5594-j06282">A System of Double Noise Reduction for Variable-Area Recording for Direct-Playback Purposes</cite>, Journal of the Society of Motion Picture and Television Engineers ( Volume: 57, Issue: 4, October 1951); SMPTE, 1951
<span class="doi">10.5594/J06282</span>
</li>