Version 1
: Received: 13 September 2024 / Approved: 15 September 2024 / Online: 16 September 2024 (09:39:59 CEST)
How to cite:
Rindel, J. H. Air Attenuation in Octave Bands and How to Normalize Room Acoustic Measurements to a Standard Atmosphere. Preprints2024, 2024091192. https://doi.org/10.20944/preprints202409.1192.v1
Rindel, J. H. Air Attenuation in Octave Bands and How to Normalize Room Acoustic Measurements to a Standard Atmosphere. Preprints 2024, 2024091192. https://doi.org/10.20944/preprints202409.1192.v1
Rindel, J. H. Air Attenuation in Octave Bands and How to Normalize Room Acoustic Measurements to a Standard Atmosphere. Preprints2024, 2024091192. https://doi.org/10.20944/preprints202409.1192.v1
APA Style
Rindel, J. H. (2024). Air Attenuation in Octave Bands and How to Normalize Room Acoustic Measurements to a Standard Atmosphere. Preprints. https://doi.org/10.20944/preprints202409.1192.v1
Chicago/Turabian Style
Rindel, J. H. 2024 "Air Attenuation in Octave Bands and How to Normalize Room Acoustic Measurements to a Standard Atmosphere" Preprints. https://doi.org/10.20944/preprints202409.1192.v1
Abstract
The air attenuation of pure tones as a function of temperature and humidity is well known and described in ISO and ANSI standards. However, room acoustic measurements are performed in octave bands, which is the reason for a complicated, nonlinear behavior of the air attenuation. It is known that room acoustic measurement results depend on air temperature and humidity, and these atmospheric data should always be reported in connection with room acoustic measurements. A calculation model for the air attenuation can make it possible to normalize the room acoustic results. For accurate results it is possible to apply a summation method on each time sample in the impulse response. An approximation to the air attenuation at and above 1 kHz is possible by linearization using the pure-tone attenuation of two different frequencies, one frequency valid for the early part of the impulse response, and another frequency valid for the later part of the impulse response. The purpose of the suggested methods is to make it possible to normalize room acoustic measurements to a standard atmosphere.
Keywords
sound absorption; air attenuation; room acoustic measurements; octave band; air temperature, relative humidity
Subject
Engineering, Architecture, Building and Construction
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
