On estimating sound power from a few single point measurements

Authors

  • Werner Richarz Pinchin Environmental, 5749 Coopers Ave, Mississauga, Ont. L4Z 1R5

Keywords:

Acoustic wave propagation, Error analysis, Functions, Image processing, Pressure measurement, Auto-correlation functions, Broad-band noise, Power spectral density (PSD)

Abstract

The features of sound pressure measurements over reflective ground for compact source radiating broad-band noise, are described. The nature of a sound field generated by a broad-band source located above a reflecting surface, is also described. The mean-square sound is composed of three terms, of which two are from the direct and reflected waves and the third term describes the interaction of the two reflected wave fields. The autocorrelation function of the band-pass filtered signal can be approximated without a priori knowledge of the power spectral density (PSD). The estimated power is smaller than the actual power, if the auto-correlation function is negative. The test reveals that the sound power estimates exhibit bias errors irrespective of other random errors. It is observed that this derivation uses the method of images and treats the measurement by 1/3 octave band filters in a realistic manner.

Published

2006-09-01

How to Cite

1.
Richarz W. On estimating sound power from a few single point measurements. Canadian Acoustics [Internet]. 2006Sep.1 [cited 2021May17];34(3):90-1. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1836

Issue

Section

Proceedings of the Acoustics Week in Canada