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"IREPROD.TRACK
-'2REPROD.TRACK
*4 EFFECTS AND/OR CONTROL TRACK} 1.377
r' 3 RE PROD. TRACK
.073
GUIDED EDGE
.050
SCANNING GAP
(MAX. PROJ. ^APERTURE SCREEN ASPECT 2.55:1
.078
HEAD
ACETATE FILM AS SEEN FROM BASE SIDE MAGNETIC COATING THIS SIDE
Fig. 1. Proposed release-print standards for CinemaScope sound track and projector aperture.
as presently used by Twentieth CenturyFox is shown in Fig. 1.
General Precision Laboratory Inc., made the first single-film stereophonic recordings of Twentieth Century-Fox demonstration material with a production prototype of the soundhead described below four months after the presentation of the problem. Electronic recording facilities were of a breadboard type, assembled partly from components lent by Twentieth Century-Fox, and recordings were made on a projector with the arc operating to provide a continuous check on synchronization. Although this was scarcely a "studio" method of operation, the recordings so produced were of commercial quality and made it clear that the final proposal would make a commercially successful product.
The Simplex Single-Film Stereophonic Sound System for the reproduction of composite stereophonic sound film contains three major new units which are added to the basic Simplex Stereophonic Sound System. These are : the magnetic soundhead, the preamplifier assembly, and the power-supply switcher assembly.
Magnetic Soundhead
The magnetic soundhead, shown in Fig. 2, is mounted on top of the projector head, as shown in Fig. 3. This departure from the conventional location of the photographic sound pickup is not new, having been employed in some early sound-on-film proposals. However, since a different synchronizing distance between picture and sound was inevitable for magnetic tracks, a separation of 28 frames behind the picture was
222
March 1954 Journal of the SMPTE Vol. 62