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Frequency in Cycles per Second Fig. 7. Loudspeaker acoustical response frequency design limits.
identical with what is used in the review rooms in Hollywood. The VU (volume unit) meter is calibrated as to the zerolevel reading by reproducing the SMPTE 400-cycle standard-level film. The dynamic-range amplifier is adjusted to indicate full scale on the volume-level indicator when using this level film. This was necessary to enable us to measure low-level dialogue sequences on the film, which would give no meter indication whatsoever if a zero-level meter setting were used.
The Motion Picture Exchange review room as shown in Fig. 8 is 60 ft long, 30 ft wide and 20 ft in height. It is made of cinder block which supplies some acoustic deadening. Therefore, our screening room is not unlike most of those in Hollywood, with the single exception that it is somewhat more reverberant. The 16mm projection equipment used in the screening room is identical in performance with that of standard review-room 35mm projection equipment.
Use of Sulfide Photoresistive Cell
One more factor of interest, to us at least, and a very important factor, was that we had pioneered, in the IC/QEB equipment, with the use of the sulfide photoresistive cell. Our reasons for using the cell were to secure a wider frequency range, higher signal-to-noise level, elimination of photocell hiss,
elimination of photocell microphonics and the elimination, in the sound head itself, of high impedances which are always a source of trouble in high humidities.
In order to corroborate our thinking with regard to the use of this cell, and to check its overall performance, two projectors were used in the evaluation of film. One projector contained the conventional cesium photoelectric cell, while the second projector was equipped with a sulfide photoresistive cell. Both of these projectors were then adjusted in output level, using the Society's 400-cycle standard level film, so that they gave the same reading on the VU meter. It then became standard practice to screen all film on the two projectors in order to determine any difference in the reproduction of film from either one of the cells. We have amassed considerable data on the various film producers' products in this manner and can state that, with the exception of dye tracks, there is no difference in the performance between the sulfide cell and the cesium cell. The blue dye track develops a signal of 5 db to 10 db less than the silver track. No other significant changes in print sound quality exist. The cell comparison data could have been presented, but have not been since there was no difference in performance other than as noted.
Orr and Cowett: 16mm Release'Quality
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