Real-time capable implementation of the phase vocoder algorithm for audio pitch shifting. Single C++ Header implementation with additional headers for the used math functions and the adapter for the used fft functions.
Memory relevant parameters like the window size are template parameters, all needed memory is reserved at compile time, thus making it suitable for memory-constrained embedded platforms.
The phasevocoder.hpp header is dependency-free but a FFT implementation is needed
for which FFTW is used and for the test application which operates
on Wave files, libsdnfile is needed.
Install dependencies, e.g with APT:
sudo apt install libfftw3-dev libsndfile1-dev
Build:
mkdir build && cd build && cmake .. && make
Launch:
./pitchshifterpp <wav_file> <semitones_to_scale>
With example sound files:
./pitchshifterpp sine1k.wav <semitones_to_scale>
The file output.wav should get generated.
For windows the dependencies (x64) are included, build in the same way like for Linux. Tested with MinGW and MSVC.
Licensed under the GNU General Public License, version 3.
FFTW is licensed under the GNU General Public License.
libsndfile is licensed under the GNU Lesser General Public License, either version 2.1 or version 3.
TRADITIONAL (?) IMPLEMENTATIONS OF A PHASE-VOCODER : THE TRICKS OF THE TRADE