Mixing an audio file with a noise file at any Signal-to-Noise Ratio and estimate it

The script create_mixed_audio_file.py and create_mixed_audio_file_with_soundfile.py can mix an audio file with a noise file at any Signal-to-Noise Ratio (SNR).

You can listen to the results of mixtures of the clean voice and the noise.

Installation

No need to install, just install the necessary libraries in each python file if you don't have them.

File format

To use this code, the format of source waveforms is as follows.

• WAV file
• 1 channel

Additionally, the sampling rate of a clean file and that of a noise file are supposed to be the same.

Usage

There are two files for creating a mixture.

• create_mixed_audio_file.py:

  • Uses wave module
  • Can read wav file with 16-bit PCM only

• create_mixed_audio_file_with_soundfile.py:

  • Uses soundfile library
  • Can read wav file with various encoding types such as 16-bit PCM, 32-bit PCM, 32-bit float, and 64-bit float.

After activating a virtualenv, you can run the files to mix an audio file with a noise file at any signal-to-noise ratio.

Example of create_mixed_audio_file.py:

$ python3 create_mixed_audio_file.py --clean_file ./data/16_bit/source_clean/arctic_a0001.wav --noise_file ./data/16_bit/source_noise/ch01.wav --snr 20 --output_mixed_file ./data/16_bit/output_mixed/20dB.wav

Example of create_mixed_audio_file_with_soundfile.py:

$ python3 create_mixed_audio_file_with_soundfile.py --clean_file ./data/64_bit/source_clean/arctic_a0001_64bit.wav --noise_file ./data/64_bit/source_noise/ch01_64bit.wav --snr 0 --output_mixed_file ./data/64_bit/output_mixed/0dB.wav

Example of estimate_snr.py:

$ python estimate_snr.py --input data/16_bit/output_mixed/20dB.wav 
Estimated SNR: 22.589152898412486

Dataset

• Voices - CMU_ARCTIC speech synthesis databases
• Noises - DEMAND: a collection of multi-channel recordings of acoustic noise in diverse environments