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English: Very simplified diagram: sound level in a reverberant cavity excited by a pulse, as a function of time. RT 60 is the reverberation time . The small variations (small vertical peaks) of the pressure along the lines are not shown.
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.
The test score is the time taken on the test, in minutes. This can also be converted to an estimated maximal oxygen uptake score using the calculator below and the following formulas, where the value "T" is the total time completed (expressed in minutes and fractions of a minute e.g. 9 minutes 15 seconds = 9.25 minutes). As with many exercise ...
A reverberation chamber is used to test the sound absorption coefficients and NRC of a material. The noise reduction coefficient (commonly abbreviated NRC) is a single number value ranging from 0.0 to 1.0 that describes the average sound absorption performance of a material. An NRC of 0.0 indicates the object does not attenuate mid-frequency ...
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The second requirement follows in part from the first and from the necessity of preventing reverberation inside the room from, say, a sound source being tested. Preventing echoes is almost always done with absorptive foam wedges on walls, floors and ceilings, and if they are to be effective at low frequencies, these must be physically large ...
Ho, Kheng-Thye; Miller, Todd D; Holmes, David R; Hodge, David O; Gibbons, Raymond J (1999). "Long-term prognostic value of duke treadmill score and exercise thallium-201 imaging performed one to three years after percutaneous transluminal coronary angioplasty". The American Journal of Cardiology. 84 (11): 1323– 1327.
In the prediction of usable frequencies, the FOT is commonly taken as 15% below the monthly median value of the MUF for the specified time and path. The FOT is usually the most effective frequency for ionospheric reflection of radio waves between two specified points on Earth. Synonyms for this term include: frequency of optimum traffic