Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1978-02-24
1981-01-06
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347M, 364832, H03K 1302
Patent
active
042439744
ABSTRACT:
The conversion of an analog signal which varies over a wide dynamic range, to digital form is accomplished by integrating the analog signal and, simultaneously therewith, integrating in a sense opposite that of the analog signal a reference signal of sufficient amplitude, to maintain the stored charge within the integrator at a relatively low nominal value. This is accomplished by placing comparators on the output of the integrator which function to cause a counter to count up or down in accordance with the relative amplitudes of the analog and reference signals as is necessary to bring the stored charge in the integrator back to the low nominal value. The output of this counter is applied to a range decoder which applies selected geometrically varying ranges of digital signals to a digital to analog converter. The output of the digital to analog converter is applied both to the subtracting or negative input of the integrator, and also provides a reference signal for the comparator. By controlling the time period of each integration and counting the amount of stored energy removed from the integrator, the counter output which is related to the such removed stored energy, is the digital equivalent of the analog signal.
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Hoeschele, Analog-to-Digital/Digital-to-Analog Conversion Techniques, 1968, pp. 416-420.
E. I. Du Pont de Nemours and Company
Sloyan Thomas J.
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