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

Page scan 000704 from Journal of the Society of Motion Picture and Television Engineers

Record Details:

Title:
Journal of the Society of Motion Picture and Television Engineers
Date:
1950-1954
Publisher:
Easton, Pa. : The Society
Volume:
Journal of the Society of Motion Picture and Television Engineers
Leaf #:
000704
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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ment was the result of an idea originated jointly by Vaughn Shaner of Eastman Kodak and Harry Brueggemann of Cinecolor. The original Welch design and the Cinecolor-Eastman modification are shown in Fig. 3. Sound Reproducer Densitometer The sound analyzer in operation at Cinecolor is standard RCA 35mm sound film reproducing and measuring equipment. The light from a 10-v exciter lamp passes through a condenser lens onto an RCA #868 phototube. It was desirable to obtain density readings that would match as closely as possible the density of the sound track as seen by the sound projector. Therefore an attachment was nTade to convert the sound reproducer to a densitometer (see Fig. 4). The original idea and design for this attachment were made by Harry Brueggemann of Cinecolor. A metal disc 7j in. in diameter was notched with J-in. teeth at ^-in. intervals. It is driven by a small synchronous motor which runs at 1800 rpm on a 60-cycle supply line and it interrupts the light beam 660 times/sec (see Fig. 5). With no film in the sound projector and the interrupter wheel in operation, the amplifier gain is adjusted to a nominal "zero" level on the standard RCA Volume Indicator MI 11265. Then introducing a film, such as a gamma strip, in the sound-track area, will cause a drop in volume of the 660-cycle note. This volume change is read in decibels on the panel, and converted to density by the equivalence 1 db = 0.05 density. Howard T. Raffety: Production Densitometry 695