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Dual-Purpose Optical Sound Prints
By C. E. BEACHELL and G. G. GRAHAM
This paper describes a method of recording and printing two separate sound tracks within the normal single-track area for 16mm or 35mm release prints. A projector conversion kit for reproducing the double tracks separately or simultaneously is also discussed. This technique has possible application in reducing distribution costs on foreign versions and in the educational and television fields.
I
N VIEW OF the greatly increased use of films in the fields of government, education, television and industry, it is often desirable to have available alternate sound versions of certain productions in order to serve the widest possible audience.
Typical applications of these versions are:
(a) For distribution in foreign countries.
(b) For presentation to audiences of different intellectual interests and training. For example, a drug firm may wish to present one technical version of a treatment to a medical audience and, using the same visuals, also present a lay audience version.
(c) For television presentation it may be necessary to present a film minus
Presented on April 25, 1952, at the Society's Convention at Chicago, 111., by C. E. Beachell and G. G. Graham, National Film Board of Canada, John St., Ottawa, Ontario, Canada.
the music track because of trade regulations.
Because of these and other potential needs it is now common practice for many film production units to record, in addition to the original language version of the film, a separate music and effects track and a voice and effects track. The music and effects track may be used for foreign or other English language dubbing and the voice and effects track may be used for television prints where restrictions on the musical score are in effect.
The details of preparing an alternate sound version of a completed production vary somewhat in different studios, but in general they follow this pattern.
First consideration must be given to the economic factors of distribution which in turn will indicate the most desirable method of presenting the newsound treatment of the film to the public. With an eye to the budget, the producer and distributor will probably discuss these techniques:
July 1952 Journal of the SMPTE Vol. 59