Sound calibration

Lof — Mon, 08 Jun 2026 09:39:11 GMT

← Older revision		Revision as of 09:39, 8 June 2026
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	==Introduction==		==Introduction==
	~~% todo~~		For continuous sounds the dBspl is normally determined by the rms of the signal. Because of the silence periods in speech there is a special way to determine the dBspl.

			==Speech==
			The standard for speech is called Active Speech Level. It determines the dBspl by removing the silent parts from the speech.

			There are two ways to do this:
			*More precise: Sum the rms only over the parts above a certain power threshold.
			*More easy: Take the rms over the total sound and estimate the percentage of silence in the speech and correct for it.

			ITU-T P.56 (Active Speech Level): This is the gold standard within speech science and telecommunications. This algorithm utilizes a dynamic threshold. Silences and background noise falling below this threshold are filtered out of the calculation. The $\text{dB SPL}$ is then calculated exclusively over the periods where speech energy is actually present.

	==Sensitivity of speakers==		==Sensitivity of speakers==

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