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

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16 J. O. BAKER AND D. H. ROBINSON [J. s. M. p. E. REFERENCES 1 KELLOGG, E. W.: "A Comparison of Variable-Density and VariableWidth Systems," /. Soc. Mot. Pict. Eng., XXV (Sept., 1935), No. 3, p. 203. 2 HARDY, A. C.: "The Rendering of Tone Values in the Photographic Recording of Sound," Trans. Soc. Mot. Pict. Eng., XI (Sept., 1927), No. 31, p. 475. 3 JONES, L. A. AND SANDIVIK, O.: "Photographic Characteristics of Sound Recording Film," /. Soc. Mot. Pict. Eng., XIV (Feb., 1930), No. 2, p. 180. 4 MAURER, J. A.: "The Photographic Treatment of Variable-Area Sound Films," /. Soc. Mot. Pict. Eng., XIV (June, 1930), No. 6, p. 636. 5 DIMMICK, G. L.: "High-Frequency Response from Variable-Width Records as Affected by Exposure and Development," /. Soc. Mot. Pict. Eng., XVII (Nov., 1931), No. 5, p. 766. 6 COOK, E. D.: "The Aperture Effect," J. Soc. Mot. Pict. Eng., XIV (June, 1930), No. 6, p. 650. 7 FOSTER, D.: "The Effect of Exposure and Development on the Quality of VariableWidth Photographic Sound Recording," /. Soc. Mot. Pict. Eng., XVII (Nov., 1931), No. 5, p. 749. 8 MEES, C. E. K.: "Some Photographic Aspects of Sound Recording," /. Soc. Mot. Pict. Eng., XXIV (April, 1935), No. 4, p. 285. GLOSSARY SANDVIK, O.: "A Study of Ground-Noise in the Reproduction of Sound by Photographic Methods," Trans. Soc. Mot. Pict. Eng., XII (Sept., 1928), No. 35, p. 790. STEINBERG, J.: "The Quality of Speech and Music," Trans. Soc. Mot. Pict. Eng., XII (Sept., 1928), No. 35, p. 633. MILLER, D. C.: "The Physical Properties of Music and Speech," Trans. Soc. Mot. Pict. Eng., XII (Sept., 1928), No. 35, p. 647. BIELICKE, W. P.: "The Processing of VariableWidth Sound Records in the Film Laboratory," J. Soc. Mot. Pict. Eng., XVH (Nov., 1931), No. 5, p. 778. SANDVIK, O., HALL, V. C., AND GRIMWOOD, W. K. : "Further Investigations of Ground-Noise in Photographic Sound Records," /. Soc. Mot. Pict. Eng., XXII (Feb., 1937), No. 2, p. 83. DIMMICK, G. L., AND BELAR, H.: "Extension of the Frequency Range of Film Recording and Reproduction," /. Soc. Mot. Pict. Eng., XLX (Nov., 1932), No. 5, p. 401. DISCUSSION MR. EDWARDS: How does the scanning slit loss affect the result? MR. BAKER: The scanning slit loss reduces the output at the higher frequencies, the loss depending upon the width of the slit. Of course, the amplifier attenuates some of the higher frequencies, too. For a 1-mil slit, say, the slit loss at 9000 cps. is 4 decibels compared with the 1000-cycle output. The loss increases at the higher frequencies. MR. NICHOLSON: The family of curves you showed gave the optimal conditions, but laboratories are generally interested in limits. How do you pick limits from the curves? What determines the point beyond which you may not go?