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1948 VARIABLE-AREA RECORDING 517
ACKNOWLEDGMENTS
The writer wishes to express his appreciation to Dr. V. Pagliarulo for his assistance in obtaining the analytic solution for distortion induced by azimuth deviation of the scanning beam, and to Mr. L. B. Browder for his invaluable help in obtaining basic information used in many of the figures.
REFERENCES
(1) E. C. Wente and R. Biddulph, "A light valve for the stereophonic soundfilm system," J. Soc. Mot. Pict. Eng., vol. 34, pp. 397-406; October, 1941.
(2) L. B. Browder, "Variable-area light-valve modulator," J. Sdc. Mot. Pict. Eng., this issue, pp. 521-534.
(3) H. C. Silent and J. G. Frayne, "Western Electric noiseless recording," /. Soc. Mot. Pict. Eng.,. vol. 18, pp. 551-571; May, 1932.
(4) G. R. Crane, "Variable matte control for variable-density recording," /. Soc. Mot. Pict. Eng., vol. 31, pp. 531-539; November, 1938.
(5) J. G. Frayne, T. B. Cunningham, and V. Pagliarulo, "An improved 200• mil push-pull density modulator," /. Soc. Mot. Pict. Eng., vol. 47, pp. 494-519;
December, 1946.
(6) E. M. Honan and C. R. Keith, "Recent developments in sound-tracks," /. Soc. Mot. Pict. Eng., vol. 41, pp. 127-136; August, 1943.
(7) T. E. Shea, W. Herriot, and W. R. Goehner, "The principles of the light valve," /. Soc. Mot. Pict. Eng., vol. 18, pp. 697-732; June, 1932.
(8) W. J. Albersheim, "Stabilized feedback light valve," /. Soc. Mot. Pict. Eng., vol. 38, pp. 240-256; March, 1942.
(9) E. D. Cook, "The aperture alignment effect," J. Soc. Mot. Pict. Eng., vol. 21, pp. 390-403; November, 1933.
(10) D. Foster, "Effect of orientation of the scanning image on the quality of sound reproduced from variable-width records," /. Soc. Mot. Pict. Eng., vol. 33, pp. 502-517; November, 1939.
APPENDIX
Referring to Fig. 12 for the off-azimuth scanning of the unilateral sound track, the instantaneous amplitude of the light transmitted by the unilateral modulation5 as scanned in the figure is given by
Y = a0 + a0 sin (x + «) (26)
where
a0 = the amplitude of the wave
x = the distance from the origin
X = the wavelength of the sound wave
u = the reflection of the scanning line S along the x axis, and
r = the deviation of the scanning beam.