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
Doc Type: Journal Article
Article Type: research-article
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
Link: https://doi.org/10.5594/J11865
Author(s): Alexis Badmaieff

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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>