Abstract
The accuracy one can expect on sound-level readings and the reproducibility obtained for different instrumentation is a function of many inaccuracies. In its present form, the precision sound-level meter is not well suited for measuring impulsive noise. Impulses and short-duration noises present severe problems when they are evaluated, compared, and analyzed. A standard for an instrument enabling impulse-noise measurements has been proposed. Different impulse-noise sources have been measured and analyzed using such an instrument. Readings have been taken for each type of noise on fast-slow and impulse-type meter circuitry as well as with a special circuit for holding the maximum rms value of a pulse with 35-msec rise time. The readings obtained are also evaluated for different weightings through the A, B, C and N networks. The actual wave shapes of the sources have been measured in order to analyze the requirements for the transient response of the microphone, the peak handling ability of the amplifier, and the rectifier circuit of the instrument. Other means of measuring, recording, and analyzing transient noises are briefly discussed.
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