Journal of the Society of Motion Picture Engineers (1930-1949)

Page scan 000251 from Journal of the Society of Motion Picture Engineers

Record Details:

Title:
Journal of the Society of Motion Picture Engineers
Date:
1930-1949
Publisher:
New York, N.Y. : The Society
Volume:
Journal of the Society of Motion Picture Engineers
Leaf #:
000251
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
The Journal of the Society of Motion Picture Engineers (SMPE)Êdocuments the technological progress of the film industry, highlighting technical developments in production and exhibition. Of special interest are articles about special effects, theater practices, lighting, and the introduction of the 16mm format. Initially titled "Transactions of the Journal of the Society of Motion Picture Engineers."Digitized by the Prelinger Library and the Library of Congress Motion Picture, Broadcasting and Recorded Sound Division.
Date Added:
July 19, 2022
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248 H. J. HASBROUCK [J. S. M. p. E. of recorder heads are shown in Fig. 2. It will be seen that frequencies below 800 cps. are controlled so as to hold the amplitudes about constant, the stylus velocity diminishing as the frequency is reduced. FIG. 3. Construction] of recording cutter and equivalent electrical circuit. This practice is followed generally in disk recording to avoid cutting through to adjacent grooves at low frequencies. The loss is made by suitable compensation in the reproducing circuit. The construction of the recording cutter and the equivalent electrical circuit are shown in Fig. 3. Since for constant current in the recorder winding, the armature receives a constant force, the electrical circuit is shown working from a constant-voltage source. The output of the mechanical system is represented by the lateral stylus velocity and is equivalent to current through the second inductance of the electrical network. This circuit has / ^ / / x 7 s ' x-""^ INK =>EAK DRMAL LEVEL L* USJ D MAX. STYLUS VELOCITY INCHES PER SEC. FIG. 4. Total distortion (rms.) to be expected at 400 cps. a rising characteristic with increasing frequency, compensating for diminishing current through the recorder winding due to inductance. The merits of lateral recording have been discussed at length. Of chief importance is the cancellation of even harmonic distortion.1