![]() ![]() If a room is untreated for sound control, the standing RT value will typically average between 3 and 10 seconds. This defines the length of time for reverberation to decay by more than 60 decibels to inaudibility. In 1900, a standard was produced to effectively measure reverberation time within a room. Reverberation is then measured by the length of time it takes for sound wave reflection to disappear. The following animation illustrates our point. If you were standing 55′ or closer to the canyon wall, you would hear one prolonged sound known as reverberation. Due to the speed of sound, if you were more than 56′ away from the wall, you would hear two different and distinct sounds separate by more than. If you have ever stood in a canyon and shouted out your name, you would shortly thereafter hear the distinct repetition of your name echoing off the canyon wall. Therefore we hear echo as two distinct sound signals, and reverberation as one prolonged sound. ![]() Our human ear cannot discern between sound signals of less than. 1 seconds, the reflection is called reverberation. ![]() 1 seconds, the reflection is called echo. The gap between these two sound signals will define echo vs. The reflection of sound can be measured in time elapsed between the end of the original sound source and the re-introduction of its signal reflecting back into a room. In either case, the sound wave is transferred as energy from molecule to molecule through either medium. Sound Transmission occurs with that portion of the energy that is able to transmit through the wall. Sound Wave Reflection occurs with that portion of the energy that stays contained to within the room. A portion of the wave will attempt to pass through the medium, while the balance of the wave will reflect back off the wall. As sound waves leave one medium and enter another, such as an air borne wave in a room reaching a brick wall, the wave will undergo certain characteristics. ![]()
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