Sound Power Measurement
A frequently used method of estimating the sound power level at a source is to measure the sound pressure level at some distance, and solve for :
If the source is in free space
or
if the source is on the floor or on a wall, such that it radiates into a half sphere.
The sound power estimated this does not diminish or increase with distance, unless reflections are present.
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Famous quotes containing the words sound, power and/or measurement:
“Only the sound remains,
the distant thump of the good elephants,
the voice of the ancient lions
and how the bells
trembled for the flying man.”
—Anne Sexton (19281974)
“The power to guess the unseen from the seen, to trace the implications of things, to judge the whole piece by the pattern, the condition of feeling life in general so completely that you are well on your way to knowing any particular corner of itthis cluster of gifts may almost be said to constitute experience.”
—Henry James (18431916)
“Thats the great danger of sectarian opinions, they always accept the formulas of past events as useful for the measurement of future events and they never are, if you have high standards of accuracy.”
—John Dos Passos (18961970)