Open AccessBandwidth extension of intensity-based sound power estimates
Author(s) -
Michael C. Mortenson,
Suzanna Gilbert,
Tracianne B. Neilsen,
Kent L. Gee,
Scott D. Sommerfeldt
Publication year - 2020
Publication title -
the journal of the acoustical society of america
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.619
H-Index - 187
eISSN - 1520-8524
pISSN - 0001-4966
DOI - 10.1121/10.0001236
Subject(s) - sound intensity , sound power , acoustics , microphone , sound intensity probe , computer science , bandwidth (computing) , microphone array , amplitude , nyquist frequency , directional sound , sound (geography) , critical distance , physics , optics , telecommunications , sound pressure
The traditional method for intensity-based sound power estimates often used in engineering applications is limited in bandwidth by microphone phase mismatch at low frequencies and by microphone spacing at high frequencies. To overcome these limitations, the Phase and Amplitude Gradient Estimator (PAGE) method [Gee, Neilsen, Sommerfeldt, Akamine, and Okamoto, J. Acoust. Soc. Am. 141(4), EL357-EL362 (2017)] is applied to sound power for a reference sound source, a blender, and a vacuum cleaner. Sound power measurements taken according to ISO 3741:2010 (2010) are compared against traditional- and PAGE-processed intensity-based sound power estimates measured according to ANSI S12.12-1992 (R2017). While the traditional method underestimates the sound power at the spatial Nyquist frequency by 7-10 dB, the PAGE-based sound power is accurate up to the spatial Nyquist frequency, and above when phase unwrapping is successful.
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