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1949
REPRODUCING CHARACTERISTIC
391
(2) Install, adjust, and maintain theater-type reproducing equipment in the studio review rooms which have the optimum required reproducing characteristic.
(3) Adjust release film so as to have the required balanced frequency response and volume range required for theaters.
(4) Adjust equipment in all theaters so that it gives identical performance in so far as possible with that in the master review rooms in the studios. (This implies a definite frequency response, depending upon the exact type of loudspeaker used.)
(5) Maintain proper correlation between those responsible for studio and theater standards.
(6) Provide necessary test films which are considered standard and essential.
The first co-ordinated work in leading up to the adoption of a published theater reproducing characteristic for 35-mm film was started
REQUENCY IN CYCLES PES SECOND
Fig. 1 — Typical 35-mm Research Council recommended response curve.
in 1937. These standard electrical characteristics were arrived at by conducting listening tests in several theaters with the object in mind to obtain the most suitable characteristic which would suitably reproduce all of the current studio product then available. In arriving at this standard electrical characteristic, several fundamental factors had to be taken into consideration. It was recognized that the background noise on film made it necessary to use a characteristic favoring the reduction of this noise. This required that a certain amount of roll-off or droop in the high-frequency spectrum be used. This factor was evaluated by observing the characteristic required to reproduce unmodulated film with a gain setting which is normally encountered while running a picture. Having determined this