Ultrasonic control system for gambling machine - has keyboard with buttons for starting and stopping machine

摘要

The control system is used for starting and stopping a rotor and used ultrasound with a frequency of from 20-30 Hz. There may be separate start and stop buttons for each of the three rotating drums of a normal gambing machine. The control buttons may be rearranged electrically in series or in parallel. There is a receiver in the machine which distinguishes between ultrasound signals of different frequencies and there are relays which regulate the motions of the three drums.