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- W1972914760 abstract "Knowledge of the room constant of an interior space is usually required whenever engineering noise control measures are to be contemplated. Easily usable and transportable experimental methods to determine the room constant are therefore desirable. One convenient method is the balloon impulse method where the impulse produced by bursting a toy balloon is used to produce a high-level broad-band excitation for decay time measurements. Extensive use of the balloon impulse method has been made in determining the room constants of beth small (typical office spaces of 5000 to 10 000 ft3) and large (200 000-ft3 factory spaces and larger) spaces. The balloon impulse method has produced results consistent with values obtained from the steady-state large-room-volume equation using steady-state decay field sound-pressure levels measured at specified distances. However, the lack of diffuse field conditions and the nature of the true directivity factor had to be considered in the comparison. Room constant determinations made solely from calculations based on estimated sabin absorption coefficients were found risky. Serious errors are possible if misjudgment of surface properties is made. This is particularly true in large volume spaces." @default.
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- W1972914760 date "1974-11-01" @default.
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- W1972914760 title "Balloon impulse techniques for engineering estimates" @default.
- W1972914760 doi "https://doi.org/10.1121/1.1914262" @default.
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