Calculadora de Nivel de Pressao Sonora Gratis
Calcule o NPS em decibeis a partir da pressao sonora.
Pa
Sound Pressure Level
94.0 dB SPL
Sound Pressure Level vs RMS Sound Pressure
Formula
Sound Pressure Level (SPL)
SPL quantifies the RMS sound pressure relative to the threshold of hearing on a logarithmic scale.
Formula
SPL = 20 * log10(p / p_0)
where p_0 = 20 micro-Pa = 2 x 10^-5 Pa is the reference pressure corresponding to the threshold of human hearing at 1 kHz.
Exemplo Resolvido
A sound wave with RMS pressure of 1 Pa.
- 01SPL = 20 * log10(p / p_0)
- 02SPL = 20 * log10(1 / 0.00002)
- 03SPL = 20 * log10(50000)
- 04SPL = 20 * 4.699 = 94.0 dB SPL
Perguntas Frequentes
What is the reference pressure p0?
20 micro-pascals (2 x 10^-5 Pa), chosen to match the approximate threshold of human hearing at 1 kHz.
How does SPL relate to sound intensity level?
Both use dB but SPL uses pressure (20 * log10) while intensity level uses power (10 * log10). They yield the same numeric value under standard conditions.
What is a typical SPL for conversation?
Normal conversation at 1 meter is about 60 to 70 dB SPL.
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