Magnitude scaling

magphase	Separate a complex-valued spectrogram D into its magnitude (S) and phase (P) components, so that D = S * P.
amplitude_to_db	Convert an amplitude spectrogram to dB-scaled spectrogram.
db_to_amplitude	Convert a dB-scaled spectrogram to an amplitude spectrogram.
power_to_db	Convert a power spectrogram (amplitude squared) to decibel (dB) units
db_to_power	Convert dB-scale values to a power values.
perceptual_weighting	Perceptual weighting of a power spectrogram.
frequency_weighting	Compute the weighting of a set of frequencies.
multi_frequency_weighting	Compute multiple weightings of a set of frequencies.
A_weighting	Compute the A-weighting of a set of frequencies.
B_weighting	Compute the B-weighting of a set of frequencies.
C_weighting	Compute the C-weighting of a set of frequencies.
D_weighting	Compute the D-weighting of a set of frequencies.
pcen	Per-channel energy normalization (PCEN)
mu_compress	Compression by μ-law
mu_expand	Expansion by μ-law