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Near field N and Far field F - Eberhard Sengpiel
http://www.sengpielaudio.com/DirectFieldAndReverberantField.pdf
Spatial distribution of direct sound and reverberant sound . Near field N and Far field F … looks only at the sound source and is . not room dependent. Each . sound source. has a far field and near field, which is only sound source-dependent. When considering the far field and the near field, acousticians. consider the
Sound level distance damping decibel ... - …
http://www.sengpielaudio.com/calculator-distance.htm
A doubling of distance from the sound source in the direct field will reduce the "sound level" by (−)6 dB, no matter whether that are sound pressure levels or sound intensity levels! This will reduce the sound pressure p (field size) to 1/2 …
D-F and R-D Field - Near field N and Far field F and ...
http://www.sengpielaudio.com/D-F_and_R-D-Field.pdf
D and R - Direct field D (Free field) and Reverberant field R (Diffuse field) mark the acoustic properties and is . room dependent. Sound technicians are especially interested in this situation with the critical distance dc. Both pairs of words do not belong in "one" figure, for "non room dependent" and "room dependent" do not fit together.
How does the sound decrease with distance? sound …
http://www.sengpielaudio.com/calculator-SoundAndDistance.htm
In a direct field or free field, the sound level (SPL) of a spherical wave decreases with doubling of the distance by (−)6 dB. The sound pressure decreases in inverse proportion to the distance, that is, with 1/r from the measuring point to the …
The relation of sound quantities references and levels ...
http://www.sengpielaudio.com/calculator-soundvalues.htm
Sound pressure p (RMS) as Sound field quantity: The auditory threshold is used as the reference sound pressure p 0 = 20 µPa = 2 × 10 −5 Pa. The threshold of hearing corresponds to the sound pressure level L p = 0 dB at f = 1 kHz. Sound intensity I as Sound energy quantity: The auditory threshold is calculated as the reference sound intensity I 0 = 10 −12 W/m 2. The threshold of …
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