Journal of the Society of Motion Picture Engineers ( Volume: 46, Issue: 1, January 1946)

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Push-Pull Frequency Modulated Circuit and its Application to Vibratory Systems

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPE
Volume: 46, No. 1, pp. 37–51
Abstract: The purpose of this paper is to describe a new push-pull frequency modulated circuit in which the push-pull action is accomplished by varying the resonant frequencies of both the oscillator and the discriminator in opposite phase relation to each other. Modulation of the oscillator and discriminator is achieved through the use of 2 capacitors with a common plate and arranged in a push-pull circuit. Thus, if the common plate is the moving element of a vibratory system, this circuit can be used for measuring vibrations or for monitoring purposes. One of the applications of the push-pull FM circuit is to calibrate recording heads while cutting phonograph records. Using this calibrator, it is possible to measure, without mechanical or inductive coupling, the actual frequency response of the cutting head under normal load, and to observe the input-output characteristics as well as the amount of distortion. It is also possible to use it for monitoring while recording.
Publication Date: 1946-01-01
DOI: 10.5594/J11865
ISSN: Print: 0097-5834
Link: https://doi.org/10.5594/J11865
Author(s): Alexis Badmaieff
Copyright: © 1946 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

Experience with an FM Calibrator for Disk Recording Heads [Active]
1 Beers G. L. Sinnett C. M. : “Some Recent Developments in Record Reproducing Systems,” J. Soc. Mot. Pict. Eng. , XL , 4 (Apr., 1943 ), p. 222 . EXTERNAL
2 Terman F. E. : “Radio Engineering,” McGraw-Hill ( New York ), 1937 , p. 360 ; Dow, J. B.: “A Recent Development in Vacuum Tube Oscillator Circuits,” Proc. I. R. E., 19 (Dec., 1931), p. 2095. EXTERNAL
3 Landon V. D. McIlwain K. : “Pender's and McIlwain's Electrical Engineers' Handbook (Electric Communication and Electronics),” John Wiley and Sons ( New York ), 3d Ed. , p. 7 . EXTERNAL
4 Fink D. G. : “Electronic's Engineering Manual,” McGraw-Hill ( New York ), p. 240 . EXTERNAL

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Alexis Badmaieff; Push-Pull Frequency Modulated Circuit and its Application to Vibratory Systems, Journal of the Society of Motion Picture Engineers ( Volume: 46, Issue: 1, January 1946); SMPTE, 1946. Available at https://doi.org/10.5594/J11865

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Alexis Badmaieff; Push-Pull Frequency Modulated Circuit and its Application to Vibratory Systems, Journal of the Society of Motion Picture Engineers ( Volume: 46, Issue: 1, January 1946); SMPTE, 1946. Available at https://doi.org/10.5594/J11865

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<span class="citation">Alexis Badmaieff; <cite>Push-Pull Frequency Modulated Circuit and its Application to Vibratory Systems</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 46, Issue: 1, January 1946); SMPTE, 1946. Available at <a href="https://doi.org/10.5594/J11865" target="_blank" rel="noopener">https://doi.org/10.5594/J11865</a></span>

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<li>
Alexis Badmaieff; <cite id="bib-10-5594-j11865">Push-Pull Frequency Modulated Circuit and its Application to Vibratory Systems</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 46, Issue: 1, January 1946); SMPTE, 1946
<span class="doi">10.5594/J11865</span>
</li>