librosa.db_to_amplitude

librosa.db_to_amplitude(S_db, ref=1.0)[source]

Convert a dB-scaled spectrogram to an amplitude spectrogram.

This effectively inverts amplitude_to_db:

db_to_amplitude(S_db) ~= 10.0**(0.5 * (S_db + log10(ref)/10))
Parameters
S_dbnp.ndarray

dB-scaled spectrogram

ref: number > 0

Optional reference power.

Returns
Snp.ndarray

Linear magnitude spectrogram

Notes

This function caches at level 30.