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Psychoacoustics
Linked via "listener"
Auditory Thresholds and Sensitivity
The primary focus of early psychoacoustic research involved mapping the limits of human hearing. The absolute threshold of hearing (ATH) defines the minimum sound pressure level (SPL) required for a listener to detect a pure tone $50\%$ of the time. This threshold is highly dependent on frequency, exhibiting a characteristic U-shaped curve in the [audiogram](/ent… -
Psychoacoustics
Linked via "listener"
Loudness Perception and the Phon Scale
Loudness is the subjective correlate of sound intensity. Unlike frequency, loudness is not perceived linearly with physical intensity. The Phon is the unit used to quantify perceived loudness level. By definition, $1,000 \text{ Hz}$ at $40 \text{ dB SPL}$ is assigned a loudness level of $40 \text{ phons}$. For other frequencies, the number of phons assigned to a stimulus is numerically equal to the SPL in d…