VoiceChanger

voice changer using JUCE platform, rubberband and soundtouch, as well as independent freq based phase vocoder implementation, as well as GMM-based voice conversion.

main functions:

compression, EQ(with arbitrary number and filter type), wah_wah, high_quality pitch shift and peak(formant) shift.

当前主流的实时pitch shift库

• rubberband
• elastique pro
• soundtouch
• melodyne

Rubberband

• frequency domain
• Options:
  • windowLength(long,short,std)
  • smoothing(open/close)
  • pitch(highSpeed, highQuality, highConsistency)
  • channels(apart, together)
  • detector(compound, percussive, soft)
  • realtime mode(singel thread), offline mode(multithread support)

algorithm

• improved phase vocoder

  • basic analysis-synthesis structure

  • record corresponding ana and syn sample numbers

  • when encounting transient component in specific frame, or the frame is silent, the phase is reset

  • the "transient" frame is determined by both "percussive" detector and "high frequency" detector in realtime mode

  • the phase increment is calculated by adjacent frequency bin if there is an increasing phase estimation error, and has the tendency to go into the next freq bin

• speex resampling method(linear interpolation also works)

2022.1.3

add basic "Voice Conversion System" framework

参考工程

https://github.com/ffAudio/Frequalizer

https://github.com/GroovemanAndCo/DAWn

https://github.com/juce-framework/JUCE

https://github.com/Tracktion/tracktion_engine

https://github.com/leomccormack/Spatial_Audio_Framework

https://github.com/ShuhuaGao/vchsm