Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1975-03-31
1977-04-05
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
179 1SC, H03K 1302
Patent
active
040165566
ABSTRACT:
A transducer converts an acoustic signal into a digital pulse code signal through optical encoding techniques. A pulsed light source emits a beam of light along a predetermined path. A digital optical encoder is located in the path and emits a digitally encoded light beam having regions in which light is present and regions in which there is an absence of light. A rotatable mirror which is located in the path of the encoded beam is connected to a diaphragm so that the angle of deflection of the encoded beam is a function of the acoustic signal. An array of digitally encoded photoconductive elements is located in the path of the deflected encoded beam. Threshold circuitry monitors the variation in the resistance of the photoconductive elements and produces an N bit digital pulse code representative of the magnitude and polarity of the acoustic signal during each occurrence of a pulsed light beam.
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GTE Laboratories Incorporated
Hart Leslie J.
Kriegsman Irving M.
Sloyan Thomas J.
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