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  • 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.
  • Hz, hertz - a unit to measure the frequency of a sound.
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