KlattSyn - Klatt Formant Synthesizer

This is a redevelopment of the classic Klatt cascade-parallel formant synthesizer. The program code is written in TypeScript, which is compiled to JavaScript. It can run within a web browser or with Node.

This implementation of a Klatt synthesizer has been developed by Christian d'Heureuse in 2019 and is based on the following documents and source code:

• D.H. Klatt (1980), "Software for a cascade/parallel formant synthesizer" (PDF)
• D.H. & L.C. Klatt (1990), "Analysis, synthesis and perception of voice quality variations among male and female talkers" (PDF)
• Fortran source code published in Klatt (1980), github.com/jh4xsy/klatt80
• klsyn, last known C version developed by D.H. Klatt himself (1983 - 1986), github.com/rsprouse/klsyn/tree/master/c
• klatt 3.03, comp.speech C version (1994), re-implementation in C of Klatt's Fortran code by Jon Iles and Nick Ing-Simmons, www.speech.cs.cmu.edu/comp.speech/Section5/Synth/klatt.html
• klatt 3.04, modernized and cleaned up by Reece H. Dunn (2011 - 2015), github.com/rhdunn/klatt
• eSpeak NG Klatt module (2015 - 2018), github.com/espeak-ng/espeak-ng/blob/master/src/libespeak-ng/klatt.c
• Praat KlattGrid module (2008 - 2019), github.com/praat/praat/blob/master/dwtools/KlattGrid.cpp

Online demo: www.source-code.biz/klattSyn
NPM package: klatt-syn
GUI application: github.com/chdh/klatt-syn-app