ACOUSTICS: Ten times the logarithm? (to the base ten) of the ratio of two mean square? values of Sound Pressure, voltage, or current. The abbreviation for "decibels" is dB. Hirschorn, Martin; Compendium of Noise Engineering - Part I Sound & Vibration Magazine, July 1987.

The logarithmic ratio of the output voltage (Vout) to the input voltage (Vin) expressed as: dB = 20 log (Vout/Vin), and may designate either network gain? or attenuation.

abbreviated "db" is the standard measure of loudness?. It is a relative measurement, used to compare two different loudness levels. For instance, if a loudspeaker? is "5 db down at 40 cycles" (usually written "-5 db"), the sound it produces at a frequency of 40 cycles per second is 5 db softer than the sound it produces at a standard reference frequency - usually 1000 Hz. The smallest readily apparent loudness? difference in music is 3 db, though sharp-eared listeners may discern differences as small as 1 db. Fantel, Hans; The True Sound of Music - A Practical Guide to Sound Equipment for the Home, 1973, E. P. Dutton & Company, Inc., New York

See Also


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