Decibel (dB)

Decibel (dB)

A logarithmic measure of ratio. To determine the decibel relationship of, for example, two voltages you use the formula dB=20*log(V1/V2). If the result is negative, V1 is less than V2. If positive, then V1 is greater than V2. For power the formula is dB=10*log(P1/P2). dB is often used loosely as shorthand for dBSPL.

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Industry/Domain: Consumer electronics
Category: Home theatre system
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decibel (dB)

Engineering; Electronic engineering

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The standard unit used to express the ratio of two power levels. It is used in communications to express either a gain or loss in power between the input and output devices.

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Unit of sound measurement on a logarithmic scale, with sound approximately doubling in loudness for every increase of 10 decibels.

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A unit of signal strength or loudness, such as the signal on a data communications channel.

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