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What is dBFS used to measure in terms of decibels?

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What is dBFS used to measure in terms of decibels?

(a) Peak amplitude of a signal

(b) Power relative to 1mW

(c) Amplitude of a signal

(d) Volume unit

The question was posed to me in class test.

This interesting question is from The Decibel in division Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

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Right option is (c) Amplitude of a signal

The explanation is: We use dBFS to measure the amplitude of a signal in comparison to the maximum value a device could handle prior to clipping. FS stands for full scale and is used to define the power level sinusoid or a full scale square wave.

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