| 摘要 |
<p>The present invention relates to motion picture special effects generation and control systems and, more particularly. to a system for simulating an effect such as an earthquake. Prior art special effects systems require extensive modification of the theater in which they are installed, or the theater must be specially built for such systems, such as those with a vibrating floor or seats. Additionally. prior special effects control systems requires special reproduction equipment which is not compatible with ordinary motion picture projection equipment. The present invention overcomes the deficiencies of the prior art by providing a special effects sytem for simulating physical sensations in an audience during the presentation of a motion picture in which relatively high intensity, very low frequency random noise is acoustically coupled to a theater space to produce psychological and physiological sensations, such as earthquake movements, in the audience. The special effects are controlled by a control sub-channel which is either frequency multiplexed onto a conventional optical audio track, or, in a magnetic stripe film format, the control sub-channel is placed on an accompanying optical track. The presence and amplitude of two control frequencies in the sub-channel are detected and logically combined, providing four separate digital function control signals and two analog control signals which are variable in amplitude.</p> |
