See test results on: https://dodiku.github.io/noise_reduction/

To install:

1. $ brew install sox
2. $ brew install vorbis-tools
3. Create a virtualenv
4. Install dependencies in one of two options:

• manually (recommended):
  $ pip3 install librosa
$ pip3 install pysndfx

• or automatically using pip:
  $ pip3 install -r requirements.txt

To run:
$ python3 noise.py

• LibROSA (documentation + repository + paper)
• Think DSP (book + repository)
• Pyo (blog post + repository)
• pysndfx (repository)

• Noise Cancellation Method for Robust Speech Recognition (PDF)
• Robust Features for Noisy Speech Recognition using MFCC Computation from Magnitude Spectrum of Higher Order Autocorrelation Coefficients (PDF)
• Improving the Noise-Robustness of Mel-Frequency Cepstral Coefficients for Speech Processing (PDF)