Institute of Electrical and Electronics Engineers (IEEE)
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SMPTE ST 137:2000
Scope
(1.1) This standard specifies the position, dimensions, reproducing speed, identity, and use of the four magnetic audio records on 35-mm motion-picture release prints. (1.2) The standard also specifies the longitudinal picture-audio displacement on the film.
SMPTE ST 137:2000 history
2000SMPTE ST 137:2000 ST 137:2000 - SMPTE Standard - For Motion-Picture Film (35-mm) — Release Prints — Four Magnetic Audio Records