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- W4246891610 abstract "This investigation was undertaken to study the reverberation time of a room for the first few of its normal frequencies and the effect of one absorbing surface on the decay of each individual mode. For this purpose a small chamber 49″×33.5″×19″ was constructed from 38″ thick slate in a steel frame; and to avoid wall vibrations it was backed on all sides with 2 in. thick layer of fine graded sand. Sound was let into the chamber through a 6-in. brass tube. 34 in. in diameter. It was packed full of No. 18 copper wires to avoid standing waves inside. The resonance response of the chamber and the effect of absorbing material placed on two different sides are shown. The decay time for each mode was measured by a reverberation meter constructed at the Institute. The results of the measurements in the steady state and the decay time are found to be in good agreement. The results show that the ratio between the decay coefficients of the material for the modes which are at grazing incidence and those at normal incidence, is approximately 12, which is the value predicted from exact theoretical considerations." @default.
- W4246891610 created "2022-05-12" @default.
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- W4246891610 date "1939-07-01" @default.
- W4246891610 modified "2023-09-25" @default.
- W4246891610 title "Effect of an Absorbing Wall on the Decay of Normal Frequencies" @default.
- W4246891610 doi "https://doi.org/10.1121/1.1902119" @default.
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