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- W2026025161 abstract "The rotating diffuser (RD) acoustic modulation spectrum in the reverberant sound field for pure tone excitation, is known to be narrowband and discrete. This is due to the relatively long geometric periodicity of the RD's position in the chamber. A statistical model of this process is formulated on the assumption that the discrete frequencies are added in random phase. Experimental and theoretical results for the probability distributions or the instantaneous pressure and pressure envelope were investigated. The AM, FM, and total spectra generated by the RD for the various rotational speeds were measured for both discrete positions and the spatial average. These results indicate that a significant amount of the RD spectral energy is FM. The experimentally measured data were used to calculate the normalized pressure-squared variance, the envelope variability, time averaging requirements, and the calculation of the expected probability distribution. A closed form approach to the calculation of the confidence levels for the measured sample variance is derived. The results show that even with a large number of measured degrees of freedom, the measured variance spread is large. Some interesting new results on the RD phenomenon will be discussed." @default.
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- W2026025161 date "1980-11-01" @default.
- W2026025161 modified "2023-10-17" @default.
- W2026025161 title "A statistical model of the rotating diffuser acoustic modulation process in a reverberant sound field" @default.
- W2026025161 doi "https://doi.org/10.1121/1.2004636" @default.
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