A group delay-based excitation source analysis and design method is introduced for extension of TANDEM-STRAIGHT, a speech analysis, modification and synthesis system. This introduction makes all components of the system be based on interference-free representations. They are power spectrum, instantaneous frequency and group delay representations. This unification has potential to solve the major weak point of VOCODER architecture for high-quality speech manipulation applications.
Bibliographic reference. Kawahara, Hideki / Morise, Masanori / Toda, Tomoki / Banno, Hideki / Nisimura, Ryuichi / Irino, Toshio (2014): "Excitation source analysis for high-quality speech manipulation systems based on an interference-free representation of group delay with minimum phase response compensation", In INTERSPEECH-2014, 2243-2247.