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1949 REPRODUCING CHARACTERISTIC 395
REFERENCES
(1) D. P. Loye and K. F. Morgan, "Sound picture recording and reproducing characteristics/' /. Soc. Mot. Pict. Eng., vol. 32, pp. 631-648; June, 1939; vol. 33, p. 107; July, 1939.
(2) Motion Picture Research Council, Inc., Technical Bulletin, "Standard Electrical Characteristics for Theater Sound System," April 20, 1948.
(3) "Motion Picture Sound Engineering," D. Van Nostrand, New York, New York, p. 100, 1938.
DISCUSSION
MR. J. A. MAURER: Mr. Hilliard, how would a projector manufacturer go about measuring the equipment to determine that he has the response recommended.
MR. J. K. HILLIARD: The Society of Motion Picture Engineers has test films which are calibrated on the basis of what you might call constant modulation and certainly by placing those in the projector and measuring, you ought to be able to determine the performance conditions in so far as frequency response occurs. Other types of tests as used in the 35-mm field are also available for 16.
MR. MAURER: I wanted to make sure that you did intend those curves to be expressed in terms of the standard test films.
MR. J. K. HILLIARD: Yes. It should have been indicated on the slide that they were in terms of constant modulated films.
MR. ELLIS W. D'ARCY: Is there anything proposed to tighten up conditions with respect to quality and things like that? Is there to be a standard established at this time in that respect as well as frequency-wise?
MR. J. K. HILLIARD : Certainly we cannot extend the frequency range without improving the other techniques which are admittedly deficient up to this time. As you all know, such things as flutter and distortion have contributed to keeping the range as limited as it is now -and we hope by co-ordinating the work of all those interested, from the manufacture of the film down to the final release in the theater, to get these people together on a common understanding as to where the bottlenecks now exist and, if possible, open up those to a point where the present handicaps will not be maintained.