Logarithmic Statistical Distribution Analyser.
DEPARTMENT OF THE ARMY WASHINGTON D C
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The patent application generally relates to statistical distribution analysers and, more particularly, to analysers which measure the distributions of discrete levels of signals on a logarithmic scale, such as decibels. A conventional type meter which employs a scaling amplifier in series with weighted filters, a true RMS detector and time averager is used to detect the variable level and convert it to an analogue voltage of magnitude proportional to the magnitude of the variable at any given instant. The voltage signal is then passed through a scaling amplifier to an analogue to digital converter. The converter is controlled by a timer with an adjustable rate in such a way that the converter output is pulsed. Each level of the digital output is connected to a counter. Since each level corresponds to a discrete range of magnitudes of the variable, the percent time within a given discrete range can be calculated from the ratio of the pulses counted at a given level to the total number of samples taken.
- Computer Hardware
- Test Facilities, Equipment and Methods