“optical sound head”的概念、定义、翻译、参考文献-科学参考

单词	optical sound head
释义	optical sound head [`äp·tǝ·kǝl `sau̇nd ´hed] ^ELECTRONICS The assembly in motion picture projection which reproduces photographically recorded sound; light from an incandescent lamp is focused on a slit, light from the slit is in turn focused on the optical sound track of a film, and the light passing through the film is detected by a photoelectric cell. Also known as optical electronic reproducer.
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