Abbreviation for decibels full scale, a unit of power as measured by a digital device.

A digital measurement has a maximum value M depending on the number of bits used. If the actual power measurement is p, the dB FS value displayed is 20log10(p/M) dB FS.

As p cannot exceed M, this reading is always negative.

See also: Bit, Decibel.

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Subjects: Units