Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 9, September 1941)
[ACTIVE]
New and Old Aspects of the Origins of 96-Cycle Distortion
Metadata
- Publisher
- SMPTE — White Plains, NY, USA
- Doc Type
- Journal Article
- Content Type
- Original Research
- Abbreviated Title
- J SMPE
- Volume
- 37, No. 9, pp. 227–255
- Abstract
- The work of previous investigations is reviewed and correlated with the results obtained in a comprehensive study of 96-cycle distortion due to the presence of sprocket-holes adjacent to the sound-track. This distortion has been known for some time. Much improvement has been made by the adoption of the magnetic-drive recorder, the non-slip printer, and the rotary stabilizer sound-head for the purpose of overcoming the problem of slippage. Recording sound on doubly perforated film will introduce 96-cycle disturbances of both amplitude and frequency modulation because of the film flexure and possible variations of film speed at the sprocket-hole rate. Processing sound records on doubly perforated film will introduce a 96-cycle hum and amplitude modulation depending upon the processing technic. Printing sound records on doubly perforated film introduces 96-cycle hum and disturbances of both amplitude and frequency modulation, due to film flexure and variations of film speed at sprocket-hole rate. Reproducing sound records on doubly perforated film introduces 96-cycle disturbances because of film flexure. Since it has been proved that the presence of the sprocket-holes adjacent to the soundtrack is the source of all 96-cycle distortion, and the omission of the sprocket-holes entirely eliminates this distortion, it becomes obvious that singly perforated film should be used throughout all phases of sound recording and reproduction if complete freedom from 96-cycle distortion is to be obtained. Substantial improvement can be realized if the singly perforated film is employed only for the original negative, master positive, and re-recorded negative, and doubly perforated film for the release prints. The use of singly perforated film throughout all phases has a decided advantage of providing additional space, without affecting the picture dimensions for a double-width sound-track or two sound-tracks, one for control or other purposes.
- Publication Date
- 1941-09-01
- DOI
10.5594/J09967- ISSN
- Print:
0097-5834 - Link
- https://doi.org/10.5594/J09967
- Author(s)
- J. O. BakerRCA Manufacturing Co., Indianapolis, Ind.R. O. DrewRCA Manufacturing Co., Indianapolis, Ind.
- Copyright
- © 1941 Society of Motion Picture and Television Engineers, Inc.
Bibliographic Reference(s)
- 1 Kellogg E. W. : “A New Recorder for Variable Area Recording,” J. Soc. Mot. Pict. Eng. , XV (Nov., 1930 ), p. 653 . EXTERNAL
- 2 Batsel C. N. : “A Non-Slip Sound Printer,” J. Soc. Mot. Pict. Eng. , XXIII (Aug., 1934 ), No. 2 , p. 100 . EXTERNAL
- Bedford A. V. : U. S. pat. No. 1,754,187. EXTERNAL
- 3 Loomis F. J. Reynolds E. W. : “A New High-Fidelity Sound-Head.” J. Soc. Mot. Pict. Eng. , XXV (Nov., 1935 ), No. 5 , p. 449 . EXTERNAL
- 4 Crabtree J. : “Sound Film Printing,” J. Soc. Mot. Pict. Eng. , XXII (Feb., 1934 ), No. 2 , p. 98 . EXTERNAL
- 5 Frayne J. G. Pagliarulo V. : “The Influence of Sprocket-Holes upon the Development of Adjacent Sound-Track Areas,” J. Soc. Mot. Pict. Eng. , XXVIII (March, 1937 ), No. 3 , p. 235 . EXTERNAL
- 6 Crabtree J. Herriott W. : “Film Perforation and 96-Cycle Frequency Modulation in Sound-Film Records,” J. Soc. Mot. Pict. Eng. , XXX (Jan. 1938 ), No. 1 , p. 25 . EXTERNAL
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J. O. Baker and R. O. Drew; New and Old Aspects of the Origins of 96-Cycle Distortion, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 9, September 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J09967
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J. O. Baker and R. O. Drew; New and Old Aspects of the Origins of 96-Cycle Distortion, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 9, September 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J09967
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J. O. Baker and R. O. Drew; New and Old Aspects of the Origins of 96-Cycle Distortion, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 9, September 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J09967
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<span class="citation">J. O. Baker and R. O. Drew; <cite>New and Old Aspects of the Origins of 96-Cycle Distortion</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 9, September 1941); SMPTE, 1941. Available at <a href="https://doi.org/10.5594/J09967" target="_blank" rel="noopener">https://doi.org/10.5594/J09967</a></span>
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J. O. Baker and R. O. Drew; New and Old Aspects of the Origins of 96-Cycle Distortion, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 9, September 1941); SMPTE, 1941
doi: 10.5594/J09967
url: https://doi.org/10.5594/J09967
doi: 10.5594/J09967
url: https://doi.org/10.5594/J09967
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<li> J. O. Baker and R. O. Drew; <cite id="bib-10-5594-j09967">New and Old Aspects of the Origins of 96-Cycle Distortion</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 9, September 1941); SMPTE, 1941 <span class="doi">10.5594/J09967</span> </li>