maad.spl.wav2leq

maad.spl.wav2leq(wave, f, gain, Vadc=2, dt=1, sensitivity=-35, dBref=94, pRef=2e-05)[source]

Convert wave to Equivalent Continuous Sound Pressure level (Leq [dB SPL]).

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
finteger: Sampling frequency in Hz
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
dtfloat, optional, default is 1 (second): Integration step to compute the Leq (Equivalent Continuous Sound level)
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)
pRefSound pressure reference in the medium (air:20e-6, water:1e-6 Pa)

Returns:

Leqfloat: Equivalent Continuous Sound pressure level (Leq [dB SPL])

Examples

>>> w, fs = maad.sound.load('../data/cold_forest_daylight.wav') 
>>> Leq = maad.spl.wav2leq (w, fs, gain=42)  
>>> maad.util.mean_dB(Leq)
    54.575482584140005