maad.features.spectral_leq

maad.features.spectral_leq(X, gain, Vadc=2, sensitivity=-35, dBref=94, pRef=2e-05)[source]

Computes the Equivalent Continuous Sound level (Leq) from a power spectrum (1d) or power spectrogram (2d).

Parameters:

Xndarray of floats: Spectrum (1d) or Spectrogram (2d). Work with PSD to be consistent with energy concervation
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 (air20e-6, water1e-6)

Returns:

LEQf: float: Equivalent Continuous Sound level (Leq) in dB SPL

Examples

>>> import maad
>>> s, fs = maad.sound.load('../data/spinetail.wav')
>>> Sxx_power,_,_,_ = maad.sound.spectrogram(s,fs)
>>> Leqf, Leqf_per_bin = maad.features.spectral_leq(Sxx_power, gain=42)
>>> print('Leq (from spectrogram) is %2.1fdB SPL' % Leqf) 
Leq (from spectrogram) is 63.7dB SPL