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Sound Intensity Measurement at Low Levels

โœ Scribed by F. Jacobsen

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
390 KB
Volume
166
Category
Article
ISSN
0022-460X

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โœฆ Synopsis

The influence of electrical background noise on sound intensity estimation with the usual "two-microphone method" is examined. It is shown that whereas electrical noise in principle has no systematic influence on measurement of the time averaged intensity, it increases the random error associated with using a finite averaging time. The additional random error depends in a simple manner on four quantities; the signal-to-noise ratio of the microphone signals, the pressure-intensity index of the sound field, the frequency, and the microphone separation distance. The error can be very large even at levels where electrical background noise would have no appreciable influence on estimation of mean square pressure. A practical consequence is that one should use microphones with high sensitivity


frequencies.

๐Ÿ“œ SIMILAR VOLUMES

Low frequency sound measurement in vehic
Low frequency sound measurement in vehicles
โœ W. Tempest; M.E. Bryan ๐Ÿ“‚ Article ๐Ÿ“… 1972 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 299 KB

Sound pressure level measurements in cars travelling at motorway speeds have shown that, in many cases, the overall level is very high in relation to the dB(A) and octave band levels, suggesting that much of the sound energy is in the low frequency and infrasonic regions. A technique has been develo