Journal of the Society of Motion Picture Engineers ( Volume: 38, Issue: 2, February 1942)

[ACTIVE]

A Frequency-Modulated Control-Track for Movietone Prints

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPE
Volume: 38, No. 2, pp. 111–124
Abstract: A 5-mil frequency-modulated track located between sound and picture areas is proposed to control reproduction in the theater from one or more soundtracks. A variation of approximately one octave in the control frequency provides a 30-db change in volume range which may be used in part for volume expansion of loud sounds or as noise reduction for weak sounds. The control-track frequency is varied manually and recorded simultaneously with the sound-track in the dubbing operation, the gain of the monitoring channel being varied in accordance with the control frequency to produce automatically the enhanced volume range desired from the release print. The track is recorded in line with the standard sound-track and does not require separate printing or reproducing apertures. It is scanned by a separate photosensitive surface, the output being converted from frequency to voltage variations by a frequency-discriminating network identical to that used in the monitoring channel. The output from the network, applied to the grid of a variable-gain amplifier in the sound channel, controls automatically the volume of the reproduced sound in accordance with that observed in the dubbing operation.
Publication Date: 1942-02-01
DOI: 10.5594/J09925
ISSN: Print: 0097-5834
Link: https://doi.org/10.5594/J09925
Author(s): J. G. FrayneElectrical Research Products, Inc., Hollywood, Calif.
F. P. HerrnfeldElectrical Research Products, Inc., Hollywood, Calif.
Copyright: © 1942 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1 Levinson N. Goldsmith L. T. : “Vitasound,” J. Soc. Mot. Pict. Eng. , XXXVII (Aug., 1941 ), p. 147 . EXTERNAL

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J. G. Frayne and F. P. Herrnfeld; A Frequency-Modulated Control-Track for Movietone Prints, Journal of the Society of Motion Picture Engineers ( Volume: 38, Issue: 2, February 1942); SMPTE, 1942. Available at https://doi.org/10.5594/J09925

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J. G. Frayne and F. P. Herrnfeld; A Frequency-Modulated Control-Track for Movietone Prints, Journal of the Society of Motion Picture Engineers ( Volume: 38, Issue: 2, February 1942); SMPTE, 1942. Available at https://doi.org/10.5594/J09925

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<span class="citation">J. G. Frayne and F. P. Herrnfeld; <cite>A Frequency-Modulated Control-Track for Movietone Prints</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 38, Issue: 2, February 1942); SMPTE, 1942. Available at <a href="https://doi.org/10.5594/J09925" target="_blank" rel="noopener">https://doi.org/10.5594/J09925</a></span>

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J. G. Frayne and F. P. Herrnfeld; <cite id="bib-10-5594-j09925">A Frequency-Modulated Control-Track for Movietone Prints</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 38, Issue: 2, February 1942); SMPTE, 1942
<span class="doi">10.5594/J09925</span>
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Referenced By

History of Sound Motion Pictures [Active]