Read multiple .wav file from computer and merge them to numpy arrays

Question

I need to read multiple wav files into separate numpy arrays, then merge the numpy arrays into one and save it as a wav file.

How do I do that?

I guess you want to concatenate arrays with the numpy.concatenate() function. — tif
– tif, Commented Aug 29, 2018 at 9:13
First thanks tif for answer me....second Yes i want to concatenate them but i think first i read those numpy arrays form computer...isn't i — Abdul Rafay
– Abdul Rafay, Commented Aug 29, 2018 at 9:22
Use scipy to read/write the wav data docs.scipy.org/doc/scipy-0.14.0/reference/generated/… — Daniel F
– Daniel F, Commented Aug 29, 2018 at 10:05
@AbdulRafay by merging do you mean 1) mixing them or 2) adding one sound after another? — Basj
– Basj, Commented Aug 29, 2018 at 10:12

Basj · Accepted Answer · 2018-08-29 10:37:38Z

3

Here is a solution:

from scipy.io.wavfile import read, write
import numpy as np

fs, x = read('test1.wav')
f2, y = read('test2.wav')

#z = x + y                    # this is to "mix" the 2 sounds, probably not what you want
z = np.concatenate((x, y))    # this will add the sounds one after another

write('out.wav', fs, z)

When doing x + y, if the 2 arrays don't have the same length, you need to zero-pad the shortest array, so that they finally have to same length before summing them.

edited Aug 29, 2018 at 10:37

answered Aug 29, 2018 at 10:08

Basj

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3 Comments

Abdul Rafay Over a year ago

Should i put all my .wav files to the folder where my .py file exist to ream them...actually i am using anaconda for python?

Basj Over a year ago

1st question: yes. 2nd question: you have to use a loop for 200 files

Basj Over a year ago

Sorry I have no time to continue so I won't be able to answer on further questions. Just a few hints: try first with 2 files, then 3 files, and once it works, use import glob for f in glob.glob('*.wav'):, it will loop on all sound files in the folder. Search SackOverflow questions about looping on files with Python for further help. Best of luck for your project! You can "accept" this answer with the tick mark if it helped ;)

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