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- STI
- Speech Transmission Index…
- Reverberation Time
- RT60 is the time required for reflections of a direct sound to decay by 60 dB below the level of the direct sound….
- RT is defined for wide band signals. When talking about the decay of an individual frequency, the term decay time is used.
- In the late 19th century, Wallace Clement Sabine started experiments at Harvard University to investigate the impact of absorption on the reverberation time. Using a portable wind chest and organ pipes as a sound source, a stopwatch and a clean pair of ears he measured the time from interruption of the source to inaudibility (roughly 60dB). This time varies directly with the dimensions of room but inversely as the absorption present.
- STI-scale
- Scale for Speech Transmission Index…
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