Journal of the Society of Motion Picture and Television Engineers (1950-1954)

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314 JOHN K. HILLIARD improvement and a distinct step forward in the quality which can be obtained in sound reproduction. Experimental use over several months has indicated that under conditions varying from Carnegie Hall broadcasts to stage, motion picture, and television, obvious improvements in sound quality have been attained. NOTE: In addition to the paper, a demonstration at the Academy Award Theatre of various types of recording, which included main title, background, combination of orchestra and solo channels, was presented. It was derived from material made by Mr. Alfred Newman of the Music Department at 20th Century-Fox Studios and the co-operation of their Sound Department. REFERENCES (1) Amos E. Dolbear, "On telephone systems," /. Frank. Inst., pp. 20-23; January, 1886. (2) E. C. Wente, "The sensitivity and precision of the electrostatic transmitter for measuring sound intensities," Phys. Rev., vol. 19, p. 498; May, 1922. (3) H. C. Harrison and P. B. Flanders, "An efficient miniature condenser microphone system," Bell Sys. Tech. J., p. 451; July, 1932. (4) F. L. Hopper, "Characteristics of modern microphones for sound recording, Jour. SMPE, vol. 33, pp. 278-288; September, 1939. (5) S. Ballantine, "Effects of diffraction around the microphone in sound measurements," Phys. Rev., vol. 32, p. 988; December, 1928. (6) R. W. Marshall and E. F. Ramonow, "A non-directional microphone," Bell Sys. Tech. J., vol. 16, p. 45; July, 1936. (7) H. F. Olson, Elements of Acoustical Engineering, Van Nostrand, New York, 1947, p. 18. (8) J. G. Frayne and H. Wolfe, Elements of Sound Recording, Wiley, New York, 1949, chap. 27, p. 544. (9) R. N. Marshall and W. R. Harry, "A cardioid directional microphone," Jour. SMPE, vol. 33, p. 260; September, 1939.