Audio spectrum extraction from audio file by python -

Audio spectrum extraction from audio file by python -

sorry if submit duplicate, wonder if there lib in python makes able extract sound spectrum sound files. want able take sound file , write algoritm homecoming set of info {timestampinfile; frequency-amplitude}.

i heard called beat detection, far see beat detection not precise method, visualisation, while want manipulate on extracted info , convert sound file. don't need real-time.

i appreciate suggestions , recommendations.

i think question has 3 separate parts:

how load sound files python? how calculate spectrum in python? what spectrum?

1. how load sound files in python?

you best off using scipy, provides lot of signal processing functions. loading sound files:

import scipy.io.wavfile samplerate, info = scipy.io.wavfile.read("mywav.wav")

now have sample rate (samples/s) in samplerate , info numpy.array in data. may want transform info floating point, depending on application.

there standard python module wave loading wav-files, numpy/scipy offers simpler interface , more options signal processing.

2. how calculate spectrum

brief answer: utilize fft. more words of wisdom, see:

analyze sound using fast fourier transform

longer reply quite long. windowing important, otherwise you'll have unusual spectra.

3. spectrum

this bit more difficult. filtering performed in time domain longer signals. maybe if tell want accomplish, you'll receive reply one. calculating frequency spectrum 1 thing, getting meaningful results in signal processing bit more complicated.

(i know did not inquire one, see coming probability >> 0. of course, may have knowledge on sound signal processing, in case irrelevant.)

python audio beat-detection