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Glossary Acustics / Term

Cumulative distribution level

A distribution of samples of the instantaneous noise level taken at regular intervals during a measurement and classified according to occurrence at increments of amplitude. Typical increments of level are either 1 or 0.5 dB intervals across the measured dynamic range of the instrument plus an over range and under range counter. An instrument with a 70 dB dynamic range classifying samples at 0.5 dB intervals plus over and under range values will have 143 separate bins to store and classify the samples. At least 1000 samples (or preferably many more) are typically needed to produce reliable values for the percentile noise levels generated from such a distribution table.

Permanent link Cumulative distribution level - Creation date 2021-04-13


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