This is a fork of Targu Mures' paulstretch_python. The repo hasn't been updated in about a decade (looks to use something like Python 3.4.x?), so I intend to update this with more modern Python.

TODO

• Write some tests and figure out where the codebase is at.
• All three files share a good bit of code. Abstract into a single shared base.
  • paulstretch() should be part of a PaulStretch class
• Replace optparse with argparse.
• Separate cli behavior into its own cli.py.
• Separate main functionality into main.py.
• Add typehints.

Original README

This is Paulstretch, Python version by Nasca Octavian PAUL, Targu Mures, Romania http://www.paulnasca.com/

Requirements: Numpy, Scipy

Original version with GUI: http://hypermammut.sourceforge.net/paulstretch/

For start, I recomand to use "paulstretch_stereo.py".

The "paulstretch_mono.py" is a very simple test implementation of the Paulstretch algorithm. The "paulstretch_newmethod.py" is a extended/slower Paulstretch algorithm which has onset detection.

"paulstretch_steps.png" describes the steps of Paulstretch algorithm graphically.

The Paulstretch algorithm is released under Public Domain.