Audio Dual Channel Separation Using Python

Some audio is a dialogue between two parties, so it may be necessary to separate the audio channels.

The sample code is as follows:

#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
 Audio dual channel separation 
"""
import sys
import numpy as np
from scipy.io import wavfile
from converter import mp3_to_wav


def split_channel(wav_path, left_wav_path, right_wav_path):
 """
  Channel separation 
 :param wav_path: wav Path of audio 
 :param left_wav_path:  Left vocal wav Audio path 
 :param right_wav_path:  Right vocal tract wav Audio path 
 :return None:
 """
 try:
  sample_rate, wav_data = wavfile.read(wav_path)
  left = []
  right = []
  for item in wav_data:
   left.append(item[0])
   right.append(item[1])
  wavfile.write(left_wav_path, sample_rate, np.array(left))
  wavfile.write(right_wav_path, sample_rate, np.array(right))
 except IOError as e:
  print('error is %s' % str(e))
 except:
  print('other error', sys.exc_info())


if __name__ == '__main__':
 mp3_to_wav('input/test.mp3', 'tmp/tmp.wav')
 split_channel('tmp/tmp.wav', 'output/left.wav', 'output/right.wav')

A custom library is called, and code is added to converter. py:

from pydub import AudioSegment


def mp3_to_wav(source, destin):
 """
 mp3  Turn  wav
 :param source:
 :param destin:
 :return None:
 """
 data = AudioSegment.from_mp3(source)
 data.export(destin, format='wav')

This code example can generate an wav file after two channels are separated.

Note: If the format of the source file is an wav file, the process of converting the format can be omitted.

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