Digital sound reproducing system for toy trains with stored digitized sounds recalled upon trackside triggering

摘要

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.