maad.spl.wav2pressure

maad.spl.wav2pressure(wave, gain, Vadc=2, sensitivity=-35, dBref=94)[source]

Convert wave amplitude to instantaneous sound pressure (p [Pa]).

Parameters:

wavendarray-like or scalar: wave should already be normalized between -1 to 1 (depending on the number of bits) take the output of the function sound.load of maad module ndarray-like or scalar containing the raw sound waveform
gaininteger: Total gain applied to the sound (preamplifer + amplifier)
Vadcscalar, optional, default is 2Vpp (=>+/-1V): Maximal voltage (peak to peak) converted by the analog to digital convertor ADC
sensitivityfloat, optional, default is -35 (dB/V): Sensitivity of the microphone
dBrefinteger, optional, default is 94 (dBSPL): Pressure sound level used for the calibration of the microphone (usually 94dB, sometimes 114dB)

Returns:

pndarray-like or scalar: ndarray-like or scalar containing the sound waveform in pressure (Pa)

Examples

>>> w, fs = maad.sound.load('../data/cold_forest_daylight.wav') 
>>> maad.spl.wav2pressure(wave=w, gain=42)
    array([ 0.00962983,  0.01148374,  0.01153826, ..., -0.00370198,
   -0.00195712, -0.00337482])

Same result with 2 functions

>>> v = maad.spl.wav2volt(wave=w)
>>> maad.spl.volt2pressure(volt=v, gain=42) 
    array([ 0.00962983,  0.01148374,  0.01153826, ..., -0.00370198,
   -0.00195712, -0.00337482]) 