Daqarta
Data AcQuisition And Real-Time Analysis
Scope - Spectrum - Spectrogram - Signal Generator
Software for Windows
Science with your Sound Card!
The following is from the Daqarta Help system:

# Formulas For Working With Sound

```
1 Pascal (Pa)  =  1 Newton/m^2

=  10 dyne/cm^2

=  10 microbar

=  94 dB SPL
```

Sound Pressure Level (SPL):

```
dB SPL = 20 * log10(P / P0)
```

where P is the measured pressure and P0 is a reference pressure in the same system of units:

```
P0  =  20 microPa  (or microNewton/m^2)

=  0.0002 microbar (or dyne/cm^2)
```

This reference pressure corresponds to a sound wave in free air with an intensity (power) I0 = 10^-16 watts/m^2, which is used as the reference for intensity in dB:

```
Intensity = 10 * log (I / I0)
```

To convert from SPL to Pa:

```
Pa = 10^((SPL - 94) / 20)
```

GO:

## Questions? Comments? Contact us!

We respond to ALL inquiries, typically within 24 hrs.
INTERSTELLAR RESEARCH:
Over 30 Years of Innovative Instrumentation
© Copyright 2007 - 2017 by Interstellar Research
All rights reserved