The Case Research Lab sound system influenced

The Case Research Lab sound system influenced many industry standards, such as location of the optical sound 20 frames in advance of the image it accompanies.[2][3][4] The current SMPTE standard for 35 mm sound film is +21 frames for optical, but a 46-foot theatre reduces this to +20 frames;[5][6] this was originally done partly to ensure the film runs smoothly past the sound head, but also to insure that no Phonofilm could again be played in theaters — the Phonofilm system being incompatible with Case Research Lab specifications — and also to ease the modification of projectors already widely in use.
Sponable worked at the Fox Film Corporation studios (later 20th Century Fox) on 54th Street and 10th Avenue in New York City until he retired in the 1960s, eventually winning an Academy Award for his technical work on the development of CinemaScope. Sponable had many contributions to film technology during his career, including the invention of the perforated motion-picture screen that allowed placing the speakers behind it to enhance the illusion of the sound emanating directly from the film action. During his years at Fox, Sponable also served for a time as an officer of the Society of Motion Picture and Television Engineers. He published a concise history of sound film in the April 1947 issue of The SMPE Journal (The SMPTE Journal after 1950).[7]


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