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A query to ask the selected Excitation object for its loudness.
the loudness in sone units.
The loudness is defined as
| ∫df 2(e(f) - 40 phon) / 10 |
where f is the frequency in Bark, and e(f) the excitation in phon. For our discrete Excitation object, the loudness is computed as
| Δf ∑ 2(ei - 40) / 10 |
where Δf is the distance between the excitation channels (in Bark).
© ppgb 19991016