H - Electricity – 03 – M
Patent
H - Electricity
03
M
354/80
H03M 1/00 (2006.01)
Patent
CA 1136280
ABSTRACT OF THE DISCLOSURE The conversion of an analog signal vary 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 neces- sary 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 integra- tion 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.
322175
E. I. Du Pont de Nemours And Company
Mccallum Brooks & Co.
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