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Re: Equal-Loudness-Level Contour Signal (ISO 226)

Fernando,

The method for doing this calculation may be found in the following paper:
Allen, Jont B. and Neely, S. T. (1997) "Modeling the relation between the intensity JND and loudness for pure tones and wide--band noise"; /J. Acoust. Soc. Am.,/ *102* (6) pp 3628--3646 

http://auditorymodels.org/GEAR/Djvu/Allen/AllenNeely97.pdf
Somewhere I have a matlab code that does this calculation, but I would need to look for it. 

The theory is discussed in:
Allen, Jont B. (1996) "Harvey Fletcher's role in the creation of communication acoustics"; /J. Acoust. Soc. Am.,/ *99* (4) pp 1825--1839, April 

http://auditorymodels.org/GEAR/Djvu/Allen/Allen96.pdf
You need to be careful to note if your looking for freefield, or under headphones. They are very different things. 

Jont Allen

On 04/07/2015 12:21 AM, Richard F. Lyon wrote:

Here is the ISO 226 code you seek:
http://www.mathworks.com/matlabcentral/fileexchange/7028-iso-226-equal-loudness-level-contour-signal
On Mon, Apr 6, 2015 at 3:07 PM, Fernando A. Marengo Rodriguez <fmarengo@xxxxxxxxxxxxxxxxxxxx <mailto:fmarengo@xxxxxxxxxxxxxxxxxxxx>> wrote: 

    Dear list,

    I would like to draw (for any value of loudness) the equal
    loudness level contour signals mentioned in ISO 226. Is there any
    mathematical expression for generating such curves in a PC?
    Otherwise, what other options do you recommend for their computer
    simulation?

    Thank you very much in advance.

    Kind regards,

    Fernando A. Marengo Rodriguez, Dr. Ing.
    -Universidad Nacional de Rosario  <http://www.unr.edu.ar/>, Argentina
    -Laboratório de Pesquisas em Processamento Digital de Sinais
      <http://www.lpds.ufsc.br/>Universidade Federal de Santa Catarina  <http://ufsc.br/>,  Brasil