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Equal-Loudness-Level Contour Signal (ISO 226)

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, Argentina
- Laboratório de Pesquisas em Processamento Digital de Sinais
Universidade Federal de Santa Catarina,