Sound unit

A sound unit is any acoustic unit of sound measurement.

• bel, B - a logarithmic unit of sound pressure equal, measured a tenth of it in decibels dB.

• dB, decibel - a logarithmic unit of sound pressure; 20 times the logarithm of the ratio of the sound pressure to reference pressure, the threshold of hearing. The sound intensity may be calculated from that measurement.

• sone - a unit of perceived loudness equal to the loudness of a 1000-hertz tone at 40 dB above threshold, starting with 1 sone.

• phon - a unit of subjective loudness.