Internal soundgen function
iso226(phon, nBarks = 22)
the phon value in dB SPL represented by the loudness curve
Calculates equal loudness curves according to the ISO226 standard. Expected range of input values in phon is 0 to 90 (1 phon is 1 dB at 1 kHz). The range of evaluated frequencies is 20 to 12500 Hz, with a total of 29 values (so upsample if more resolution is needed, but not that beyond 22 barks it's just assumed to be flat). Translated from the matlab implementation by Jeff Tackett (03/01/05) available from "https://www.mathworks.com/matlabcentral/fileexchange/ 7028-iso-226-equal-loudness-level-contour-signal"
A dataframe containing evaluated frequencies and SPL values
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