Arrangement and method for measuring the direct sound radiated by acoustical sources
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United States of America Patent
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Feb 28, 2017
Grant Date -
Jul 17, 2014
app pub date -
Jan 10, 2014
filing date -
Jan 11, 2013
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Abstract
The invention provides an arrangement and a method for measuring the direct sound wrad radiated by an acoustical source under test (e.g. loudspeakers) under the influence of acoustic ambient noise sources Q1 and reflections at acoustical boundaries (e.g. room walls). An acquisition device measures a state variable pt(rm) of the sound field at a plurality of measurement points rm in a scanning range Gm by a sensor and generates a scanned data set pGm,tQ0,Q1. Based on this data set an analyzer determines the coefficients CradQ0 associated with expansion functions which are solutions of the wave equation. An identifier uses the scanned data set pGm,tQ0,Q1 for generating parameter information P for the analyzer which are the basis for separating the direct sound wrad from room reflections wref and other waves wsec scattered at the surface of the source under test. An extrapolator predicts the state variable pradQ0 of the direct sound wrad at any point outside the scanning range Gm by using the coefficients CradQ0 of the wave expansion.
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