Railways – Car-carried propulsion system – Electric
Patent
1991-03-13
1992-12-29
Oberleitner, Robert J.
Railways
Car-carried propulsion system
Electric
105 27, 104DIG1, 246193, 446410, B60L 100, B60L 904
Patent
active
051742160
ABSTRACT:
A digital sound reproducing system which produces a plurality of sound effects from digital data stored at predetermined addresses in a digital sound memory. A controller connected to the digital sound memory causes recall of a sound data from a predetermined sequence of addresses when triggered. This recalled sound data is converted into an analog audio signal for reproduction by a speaker. In a first embodiment the digital sound reproducing system is disposed in the car of a model train. Magnets disposed between the tracks trigger corresponding sound effects when the digital sound reproducing system detects passage of the magnets. A speed sensor detects the rotation rate of a wheel of the car to permit sound effects to be synchronous with the rate of speed of the model train. The digital sound reproducing system may alternately be disposed in a fixed structure and triggered by a command signal or by detection of passage of the model train. In a second embodiment, a detector indicates when a space may be occupied triggering a radomized sound sequence as background noise.
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Green Keith F.
Miller Gary L.
Miller Electronics
Morano S. Joseph
Oberleitner Robert J.
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