Optical sensing circuit for audio activation of toys
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United States of America Patent
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Apr 21, 1987
Issued Date -
N/A
app pub date -
Feb 14, 1986
filing date -
Mar 28, 1983
priority date (Note) -
Expired
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Abstract
A noise-generating toy includes first and second optical sensors to detect the intensity of light in first and second optical fields, respectively. The sensor signals serve as inputs to a comparator which provides as an output a differential signal indicative of the difference between the sensor outputs. The comparator output drives an oscillator which generates audio signals in response to the differential in the intensity of light. The oscillator drives one or more speakers with the audio signals, and the speakers use the audio signals to produce audible sound or noise.
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