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SENSING_CANE_FOR_BLIND

2015-03-22 01:26  
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SENSING_CANE_FOR_BLIND
Capacitance-sensing probe in tip of cane changes frequency of one oscillator in accordance with distance from ground, curb, or holes, to make beat-frequency oscillator produce audio tone in headset worn by blind person.-J. Markus and V. Zeluff, Handbook of Industrial Electronic Control Circuits, McGraw-Hill, N.Y., 1956, p 24.