maad.spl.psd2leq

maad.spl.psd2leq(P, gain, Vadc=2, sensitivity=-35, dBref=94, pRef=2e-05)[source]

Convert Power spectral density (PSD, amplitude²) into Equivalent Continuous Sound pressure level (Leq [dB SPL])

Parameters:
Pndarray-like (1d)

ndarray-like containing the Power spectral density (PSD=amplitude²)

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)

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') 
>>> Sxx_power,tn,fn,_ = maad.sound.spectrogram (w, fs)
>>> S_power_mean = maad.sound.avg_power_spectro(Sxx_power) 
>>> maad.spl.psd2leq(S_power_mean, gain=42)
    53.55842473963429