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Reverberant sound field |
| A sound field in which sound waves are equally likely to arrive at the observation point from any direction. A very hard-surfaced room is an example of a reverberant room. |
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Reverberation time (sec) |
| The time required for the sound level to decay 60 dB from its original level after the sound source is stopped. Reverberation time is one of the criteria used for occupied spaces. |
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rms (root-mean-square) |
| The square root of the time-weighted average of the squared value of a time-varying phenomena. It is the "effective" value of the physical quantity. The most commonly known example is ordinary electrical power where the rms value of voltage is about 115 volts whereas the actual voltage varies as a sine wave over one cycle from plus 160 volts to minus 160 volts. Sound pressure levels are measured using rms quantities. |
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