Technical foundations of TANDEM-STRAIGHT, a speech analysis, modification and synthesis framework

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WORLD: A Vocoder-Based High-Quality Speech Synthesis System for Real-Time Applications (2016, methodology): “TANDEM-STRAIGHT [12], [13] is supposed to be a simplified version that outputs almost all the same parameters as STRAIGHT.”
Quantifying Sources of Variability in Infancy Research Using the Infant-Directed-Speech Preference (2020, methodology): “Measurements were made using STRAIGHT (Kawahara & Morise, 2011), using default values for extraction of the fundamental frequency (F0).”
Simplified aperiodicity representation for high-quality speech manipulation systems (2012, background): “Detailed discussion on this cepstrum-based implementation is given in the literature [7].”
CheapTrick, a spectral envelope estimator for high-quality speech synthesis (2015, methodology): “To reduce the computational cost while maintaining the sound quality, we proposed TANDEM-STRAIGHT (Kawahara et al., 2008; Kawahara and Morise, 2011) as an improved version of STRAIGHT.”
Temporally variable multi-aspect N-way morphing based on interference-free speech representations (2013, background): “An integration variable ξ is a point on the time axis of A.”