The "one-third-octaves" have been standardized for scientific instruments commonly used for tasks like to determine NC-criterion and similar.
|listen to the sound! - touch and click the frequency below!|
|Lower Band Limit|
|Upper Band Limit|
The wavelength depends on the speed of sound and can be calculated as
λ = c / f (2)
λ = wavelength (m)
c = speed of sound (m/s)
f = frequency (s-1, Hz)
Sound velocity depends on the density of the air and the air temperature. Typical value for speed of sound is 343 m/s for temperature 20oC.
Room acoustics and acoustic properties, decibel A, B and C, Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity and sound attenuation.
Sound pressure filters that compensates for the hearing sensed by the human ear.
The sound generated by a fan depends on the motor power, the volume capacity, the static pressure increase and the discharged volume.
Noise Criterion - NC - level is a standard uesd to describe the relative loudness of a space within a range of frequencies.
An online Noise Rating (NR) calculator.
Frequencies vs. notes and octaves.
An introduction to the nature of sound with frequencies, wave-lengths and octaves.
Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!
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