Self Noise

Extraneous non-acoustical signals, generated or induced in a measurement system. Take just about any audio system, turn it up very loud with no signal being played, and put your ear close to a speaker in a very quiet room and you will hear some hiss.

Microphone inherent self-noise is usually specified as the equivalent Sound Pressure Level (SPL) which would give the same output voltage, with typical values being 15-20 dB SPL.

See also: Microphone, Noise.

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