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Sound level meters measure pressure, from which intensity is derived

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tags	ja-picks, define, factual_claims, trade, singleton, category/factual-claims
aliases	@lentz_psychoacoustics_2019, loc. 678

Sep 20, 20261 min read

Sound level meters measure pressure, from which intensity is derived

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Note, the sound level meter actually measures sound pressure, not intensity. However, because there is a known relationship between sound pressure and sound intensity, we can calculate intensity and dB SPL from the sound level measurement. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 678

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DEFINE: Precision point on what a sound level meter physically captures.

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Sound level meters measure pressure, from which intensity is derived
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Leq integrates squared pressure over time to estimate noise exposure
Loudness lacked any measurement tool or unit until Stevens invented both.
Negative SPL readings indicate levels below the reference threshold.
Reported sound levels almost always refer to pressure, matching human hearing
Slow and fast meter responses trade averaging for capturing rapid level changes
Sound impulsiveness resists simple psychoacoustic measurement
Sound level convention defaults to pressure level because it is measurable and matches hearing.
Sound pressure and intensity relate through air impedance of roughly 415 rayls
Sound pressure level and intensity level coincide only without reflecting surfaces
Jennifer Lentz — Psychoacoustics- Perception of Normal and Impaired Hearing with Audiology Applications
Jennifer Lentz — Psychoacoustics- Perception of Normal and Impaired Hearing with Audiology Applications

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Sound level meters measure pressure, from which intensity is derived

Sound level meters measure pressure, from which intensity is derived

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