| 摘要 |
A method is disclosed whereby a motion picture projector is equipped to operate at two or more different speeds, such as 24 and 30 frames per second. It is envisioned that different parts of a motion picture may be recorded at different frame rates, to variably impart a highly intense effect upon the audience, expanding the parameters of creative control for the producer of the film. In operation, the method described facilitates switching between these different frame rates, both during the presentation of a single motion picture and between pictures. Cue signals recorded onto the film actuate the change in speed. The projector is automatically set to switch operation into a different speed, and the frames of the film that will be shown during the transitional period are prepared to give the audience the impression of a smooth transition between speeds. Alternate frames to be shown during this transitional period are underexposed, the degree of underexposure increasing or decreasing linearly until the new speed is attained. The illusion of flicker is thus created during transition, so that the audience will perceive flicker as disappearing suddenly at the higher speed, or appearing suddenly as soon as deceleration begins. Audio information is digitally processed to be played back at the marginal speed of each specific frame as it is projected. The system described can be combined with other elements of a high-impact picture-dominance system, such as a high level of screen brightness and the expansion of a film image to provide a highly realistic experience.
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