![]() It can be too high (generally, > 2 seconds), and the room is considered "echoic." It can be too low (< 0.3 The optimum RT60 depends on the use of the room. This question is more complicated than you might think. To note that reverberation time in a particular space varies with the frequency of the sound source. Or, as the website HyperPhysics*, from Georgia State University, puts it, "60 dB is a typical range of dynamic levels for orchestral music. Time it takes for the loudest noise in a concert hall to fade to the background level. Why 60 dB? That seems like a somewhat arbitrary number, but here's one way to think of it: the loudest sound level in orchestral music is typically 100 dB, while 40 dB is a reasonable background noise level for listening to music. RT60 is defined as the measure of the time after the sound source ceases that it takes for the sound pressure How can we make objective measurements of reverberation? We use the metric Reverberation Time 60 (RT60). Reverberation time is the time after the source of the sound has ceased that it takes the sound to fade away. Sound waves can bounce off the floor, walls, ceiling, and any other reflective surface gradually losing energy over time. We know that sound consists of pressure waves, so it makes sense that in a room sound bounces around. What instrumentation do you need to measure Reverberation Time?. ![]() How do I know whether to use T20 or T30?.Occupational Noise Evaluation & Industrial Hygiene.
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