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. Author manuscript; available in PMC: 2016 Mar 8.
Published in final edited form as: J Voice. 2005 Dec 1;20(4):513–526. doi: 10.1016/j.jvoice.2005.08.009

Figure 1.

Figure 1

Phon and Sone as given by ISO standards. (a) Equal loudness curves of pure tones showing the frequency and level relationship between dB SPL and phon. (b) The relation between equal loudness (phon) and loudness level (sone).