Non-Uniform Perfect Reconstruction Filterbanks

This is a repository containing various simulations and implementations of non-uniform, perfect reconstruction (NUPR) filterbanks. The repo is organized as follows:

• Proposal: A proposal for potential projects to be built using
  NUPR filterbanks.
• Simulations: Python simulations to determine the feasibility
  as well as the pros and cons of different NUPR techniques.
• GraphicEQ: A graphic equalizer built using a NUPR filterbank (in
  progress).

References

• Julius Smith, Spectral Audio Signal Processing, "Perfect
  Reconstruction Filter Banks"
• Julius Smith, DAFX-09, "Audio FFT FIlter Banks"
• Regalia, Mitra, et al. IEEE Trans. Circuits Syst., 1987,
  "Tree-Structured Complementary Filter Banks Using All Pass Sections"

Constant-Q Transform

• Holighaus et al., IEEE TRANSACTIONS ON AUDIO, SPEECH, AND LANGUAGE PROCESSING, 2013, "A framework for invertible, real-time constant-Q transforms"
• MATLAB Toolbox: Schorkhuber et al., "A Matlab Toolbox for Efficient Perfect Reconstruction Time-Frequency Transforms
  with Log-Frequency Resolution"
• Applied: Schorkhuber et al., DAFX-12, "Pitch Shifting of Audio Signal Using the Constant-Q Transform"

License

This project is licensed under the General Public License.