Abstract
The “back-door” approach to noise level evaluations described by R. H. Peterson [J. Acoust. Soc. Am. 37, 1197(A) (1964)] has been implemented on a general-purpose digital computer. The method is useful for evaluating the noise radiated by a machine or other source that produces single or repeated bursts. With this method, the octave-band spectrum and noise rating of a single machine cycle or other transient are determined after one or more segments of the signal are attenuated. This enables the noise control engineer to identify those portions of the transient that contribute significantly to the noise rating. The Cooley—Tukey algorithm is used to compute the power spectrum. The transient is segmented into short (8.192 msec) records so that the methods developed by Welch [IEEE Trans. Audio Electron. 15 (1967)] may be applied. Applications to transients produced by representative IBM machines are presented.
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