MOTION-PICTURE audio received major treatment at the 74th Semi-Annual Convention of the Society of Motion Picture and Television Engineers, held in New York City, October 5-9, 1953. This was to be expected because the commercial introduction of wide-screen processes (and also 3-D) has been accompanied, in most cases, by changes of one kind or another in the systems and techniques used to record and reproduce the sound. The present piece will attempt to summarize and comment on most of the SMPTE papers and discussions which dealt with multichannel magnetic reproduction systems, "buttonon" magnetic soundheads, magnetic head wear, the basic principles of binaural and stereophonic sound, equalization, magnetic projectors, lip synchronization equipment and techniques, etc.
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