About

A small program written as a test case during application to VK Marusya team. Program can be used as a console line tool to stretch/compress audio file without change of pitch by use of phase vocoder. In detail it consists of 3 following stages:

1. Analysis - Short-Time Fourier Transform
2. Processing - correction of phase values
3. Synthesis - Inverse STFT and summing up windows over new audio length

Install and run

git clone [email protected]:shredder67/phase-vocoder.git
cd phase-vocoder

To run, simply copy this:

./run.sh [input_file.wav] [output_file.wav] [stretch_ratio]

Results

References

1. Guitar Pitch Tutorial Algorithm description [url]
2. Awesome video on intuition behind FT in general [url]