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- W2048582381 abstract "A minimum distance between source and microphone is necessary for practical measurements of reverberant sound power and sound transmission loss. This is intended to limit error due to contamination by the direct field. An experimental/graphical procedure for its determination is prescribed in two important measurement Standards (ANSI S1.21-1972 and ASHRAE 36–72). To supplement this procedure, we offer a simple formula for estimating this minimum distance. It is useful when the source directivity factor can be estimated. Also intended for these cases, an experimental procedure for spatial averaging in semireverberant fields is described wherein the direct field bias can be precisely estimated. This procedure requires spatial averaging on a segment of a straight line passing through the acoustic center of the source. Finally, a formula is given for spatial variance measured in this region of a semireverberant field." @default.
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- W2048582381 date "1973-07-01" @default.
- W2048582381 modified "2023-10-16" @default.
- W2048582381 title "Formulae for Estimating Minimum Measuring Distance, Bias, and Variance in Semireverberant Fields" @default.
- W2048582381 doi "https://doi.org/10.1121/1.1978011" @default.
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