Libreng Engineering Tool #216
Tagapalit ng Antas ng Tunog
Convert between unweighted sound pressure level (dB SPL) and sound pressure (Pa). Enter a value in either unit and get an instant conversion. Note: A-weighted levels in dB(A) are not directly convertible to Pa.
SPL = 20·log₁₀(p/p₀)dB SPL ↔ PaUnweighted
Results
Sound Pressure
—
dB SPL
—
Sound Pressure
—
Sound Pressure Level
kung saan ang p₀ = 20 μPa = 2 × 10⁻⁵ Pa (threshold ng pandinig)
A Note on dB(A)
This converter works with unweighted sound pressure levels (dB SPL). An A-weighted level, dB(A), applies a frequency-dependent correction curve that approximates human hearing sensitivity. Because the correction varies with frequency, a single dB(A) value cannot be converted to sound pressure in Pa without knowing the frequency spectrum of the sound. Do not enter dB(A) readings into this tool expecting an exact pressure value.
Mga Karaniwang Lebel ng Tunog
| Level (dB) | Pressure (Pa) | Example |
|---|---|---|
| 0 | 0.00002 | Threshold ng pandinig |
| 30 | 0.00063 | Quiet room |
| 60 | 0.02 | Normal na pag-uusap |
| 85 | 0.36 | Heavy traffic |
| 94 | 1.0 | 1 Pascal reference |
| 120 | 20.0 | Pain threshold |
| 140 | 200.0 | Jet engine (malapit) |
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