Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1977-08-23
1978-09-05
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
307257, 324 99D, 340347M, H03K 1320
Patent
active
041124286
ABSTRACT:
An analog to digital converter wherein an incremental pulse width modulator controls first and second modes of operation of a bridge network of switches such that the bridge network of switches passes a precision current from a current source into a summing input of an integrator during the first mode of operation and away from the summing point of the integrator during the second mode of operation. The bipolar precision current from the bridge network of switches is summed with an analog current at the summing input of the integrator to cause the integrator to develop a voltage signal proportional to the integral of the sum of these currents. In response to the voltage signal and to clock pulses, the incremental pulse width modulator precisely controls the first and second modes of operation of the bridge network of switches and enables an output circuit to generate a digital representation of the amplitude of the analog current.
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The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1962, pp. III-1 to III-7.
Landee et al., Electronic Designer's Handbook, McGraw-Hill Book Co., Inc., 1957, pp. 23-31 & 23-32.
Hamann H. Fredrick
Humphries L. Lee
Pitts Rolf M.
Rockwell International Corporation
Sloyan Thomas J.
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