optical soundtrack
noun
the final soundtrack on a motion picture, which appears as a band of black and white serrations along a strip of film to the left of the composite print. Light is shined through the serrations and is converted to audible sound.
Also called
optical track.
Words nearby optical soundtrack
optical resonator,
optical rotation,
optical scanner,
optical scanning,
optical sound,
optical soundtrack,
optical tooling,
optical tweezers,
optical wedge,
optician,
opticianry