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- Sones
perceived loudness
- At 1kHz and above, loudness perception is
approximately logarithmic above 50 dB SPL or so
- Below 1kHz, loudness is more linear with amplitude
- Phons = ``dB SPL at 1kHz''
- At other frequencies, find the amplitude in phons by following
an equal-loudness curve2over to 1 kHz and reading off the level there in dB SPL
- Equal-loudness curves often used (see ISO standard 226:2003)
- All pure tones have the same perceived
loudness at the same phon level, and the dB SPL at 1 kHz defines the
loudness of such tones in phons
- Upper plot (in sones) predicts only 3 audible intervals
- Listening level is low
- Prediction is good
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