Audio Performance of Magnetic Prestriped Super-8 Motion-Picture Films

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPTE
Volume: 84, No. 4, pp. 249–257
Abstract: Audio engineers who design magnetic record and playback equipment for magnetic prestriped super-8 motion-picture films require a knowledge of the magnetic and electroacoustic properties of the film for optimum system design. Although all of our prestripes have similar inherent magnetic properties, the resultant audio data depend upon whether an 8mm or 16mm format is tested. The different film velocities, record track widths, and equalization standards involved with these formats have a significant effect on the audio performance. The scope of this paper is therefore limited to the super-8 films. In an attempt to help guide the equipment designers and customers, we have chosen to present the properties of our prestripes in an absolute manner whenever possible, as well as to report the conventional measurements relative to a specific reference. Shortcircuit flux values are given to permit calculation of the actual head output voltages to be expected. Furthermore, the intermodulation and harmonic distortion measurements, and the saturation output levels relative to an absolute shortcircuit flux level, provide additional data to predict the recording quality obtainable from the magnetic prestripe. For convenience in a qualitative appraisal, the prestripes are also compared on a relative basis with a full-width coated magnetic film. The Eastman Kodak Co. prestriped super-8 film audio output, frequency response, and surface characteristics are shown to be similar to those of good-quality audiotape.
Publication Date: 1975-04-01
DOI: 10.5594/J13373
ISSN: Print: 0361-4573
Link: https://doi.org/10.5594/J13373
Author(s): David L. CarrMagnetics Technology Section, Manufacturing Technology Div., Eastman Kodak Co., 1669 Lake Ave., Rochester, NY 14650.
Copyright: © 1975 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

Equipment and Film Parameters for Optimum Magnetic Sound Transfer on Super-8 Print Film [Active]
Technique for the Examination of Contact Area of Magnetic Tapes [Active]
Standardized Audio Response from Magnetically Striped Motion-Picture Films [Active]
Interpretation of Dimensional Changes in Cellulose Ester Base Motion-Picture Films [Active]
Wear of Permalloy Magnetic Heads against Striped Motion-Picture Film [Active]
1. McKnight J. G. , “Tape flux measurement theory and verification,” Jour. AES , 18 : 250 – 262 , June 1970 . EXTERNAL
10. Tremaine H. M. , Audio Cyclopedia , Howard W. Sams & Co. , 2nd Ed. , 772 , 1969 . EXTERNAL
11. Terman F. E. Pettit J. M. , Electronic Measurements , McGraw-Hill Electrical Electronic Engineering Series , 2nd Ed. 338 , 1952 . EXTERNAL
12. Chirlian P. M. , Analysis and Design of Electronic Circuits , McGraw-Hill Electrical and Electronic Engineering Series , 70 – 77 , 1965 . EXTERNAL
13. General Radio Company , “Operating Instructions for Type 1303-A Two-Signal Audio Generator,” Form 735-B, March 1954 . EXTERNAL
14. Waddington D. E. O'N. , “Intermodulation distortion measurements,” Jour. AES , 12 : 221 , July 1964 . EXTERNAL
5. Morrison J. R. , “Particulate materials vs thin film,” Annals of the New York Academy of Sciences—Advances in Magnetic Recording , 189 : 85 , Jan. 3, 1972 . EXTERNAL
7. Mee C. D. , The Physics of Magnetic Recording , Selected Topics in Solid State Physics, John Wiley and Sons, Inc. , 11 : 17 , 1969 . EXTERNAL
9. NAB Standard : Magnetic Tape Recording and Reproducing (Reel-to-Reel), April 1965 . EXTERNAL

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David L. Carr; Audio Performance of Magnetic Prestriped Super-8 Motion-Picture Films, Journal of the SMPTE ( Volume: 84, Issue: 4, April 1975); SMPTE, 1975. Available at https://doi.org/10.5594/J13373

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David L. Carr; Audio Performance of Magnetic Prestriped Super-8 Motion-Picture Films, Journal of the SMPTE ( Volume: 84, Issue: 4, April 1975); SMPTE, 1975. Available at https://doi.org/10.5594/J13373

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<span class="citation">David L. Carr; <cite>Audio Performance of Magnetic Prestriped Super-8 Motion-Picture Films</cite>, Journal of the SMPTE ( Volume: 84, Issue: 4, April 1975); SMPTE, 1975. Available at <a href="https://doi.org/10.5594/J13373" target="_blank" rel="noopener">https://doi.org/10.5594/J13373</a></span>

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David L. Carr; Audio Performance of Magnetic Prestriped Super-8 Motion-Picture Films, Journal of the SMPTE ( Volume: 84, Issue: 4, April 1975); SMPTE, 1975
doi: 10.5594/J13373
url: https://doi.org/10.5594/J13373

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<li>
David L. Carr; <cite id="bib-10-5594-j13373">Audio Performance of Magnetic Prestriped Super-8 Motion-Picture Films</cite>, Journal of the SMPTE ( Volume: 84, Issue: 4, April 1975); SMPTE, 1975
<span class="doi">10.5594/J13373</span>
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Referenced By

Motion Pictures [Active]