(1) See noise gate.

(2) A control voltage generated by any key on a synthesizer keyboard that instructs signal generators and other devices to begin operating. (3) The part of a movie camera that has an opening to allow light from the lens to expose the film, and that holds the film steady during that exposure. In a projector, the light source illuminates the frame held steady in the gate. The lens then projects the image onto a screen.

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