Sone

Part of speech: noun

Definitions

  1. A unit of loudness that reflects the perceived intensity of sound relative to a reference sound level
  2. An acoustic measurement equivalent to the loudness of a sound at 1,000 Hz that is perceived as one sone
  3. A scale used to quantify loudness, with one sone representing the sound level that an average person perceives as a baseline loudness

Etymology: Before the advent of precise medical instruments for measuring hearing, people relied on more subjective methods to describe sound intensity. The term in question originated in the 1930s as a unit of loudness, developed by British psychologist and engineer Stanley Smith Stevens. His work aimed to quantify how humans perceive sound levels, which do not increase linearly with physical intensity. The introduction of this unit allowed for a more accurate representation of perceived loudness rather than mere acoustic power. The word itself was coined by Stevens as a derivative of the Latin "sonus," meaning sound, combined with the suffix "-e" to form a singular noun that could stand alongside other measurement units. Its plural form, "sones," follows standard English pluralization. Unlike decibels, which measure physical sound pressure, this unit reflects subjective auditory perception, making it valuable in psychoacoustics and audio engineering. Stevens introduced the scale with the sone defined such that 1 sone corresponds to the loudness of a 1,000 Hz tone at 40 decibels above the listener’s threshold. Importantly, this scale is linear with respect to perceived loudness: a sound rated 2 sones is perceived as twice as loud as one sone, a feature distinguishing it from logarithmic scales like decibels. The term entered technical English usage primarily in the mid-20th century, appearing in psychological and acoustical literature as researchers sought better ways to describe human hearing. While it remains specialized, the word captures a significant shift from objective measurement to subjective experience, illustrating the challenge of quantifying sensory phenomena.

Synonyms: loudness unit, unit of loudness