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Reverberation time is a measure of the time required for the sound to "fade away" in an enclosed area after the source of the sound has stopped. When it comes to accurately measuring reverberation time with a meter, the term T 60 [6] (an abbreviation for reverberation time 60 dB) is used. T 60 provides
The calculation of the critical distance for a diffuse approximation of the reverberant field: =, where is the degree of directivity of the source (= for an omnidirectional source), the equivalent absorption surface, the room volume in m 3 and the reverberation time of room in seconds.
The most appropriate reverberation time depends on the use of the room. RT60 is a measure of reverberation time. [9] Times about 1.5 to 2 seconds are needed for opera theaters and concert halls. For broadcasting and recording studios and conference rooms, values under one second are frequently used. The recommended reverberation time is always ...
Summing up these contributions, a reverberant pressure field is created. The more reverberation, the more the field is diffused. Two oft-used measures of reverberation time quantify this parameter, : and . These values are the interval for the sound pressure level to the lower of 30 or 60 dBSPL. It can be obtained by measuring the sound ...
3D sound system with Reverberation Reconstruction flowchart. The reverberation reconstruction involves measuring the sound by a four-point microphone to measure its real delivery delays in different locations. Each microphone measures an impulse response from a time-stretched pulse signal for various time frames with various sound sources.
For example, in architectural acoustics the rectilinear trajectories of sound rays make it possible to determine reverberation time in a very simple way. The operation of fathometers and hydrolocators is based on measurements of the time required for sound rays to travel to a reflecting object and back. The ray concept is used in designing ...
Excessive reverberation time, which can be calculated, can lead to poor speech intelligibility. Ceiling of Culture Palace (Tel Aviv) concert hall is covered with perforated metal panels. Sound reflections create standing waves that produce natural resonances that can be heard as a pleasant sensation or an annoying one. [6]
Some advanced sound level meters can also include reverberation time (RT60) (a measure of the time required for the sound to "fade away" in an enclosed area after the source of the sound has stopped) measurement capabilities. Measurements can be done using the integrated impulse response or interrupted noise methods.