Glottisplus

Glottisplus is an open-source software framework for glottal signal processing and voice analysis. It provides tools for modeling, extracting, and manipulating glottal sources in speech, and is intended for researchers, developers, and clinicians working with speech synthesis, voice quality assessment, and phonation research.

The architecture is modular, consisting of a core glottal source engine, algorithms for estimating glottal closure instants, and interfaces to common audio pipelines. It supports real-time operation, multi-channel processing, and extensible plug-ins. Core components expose APIs in Python and C++, with experimental bindings for MATLAB and R, and it interoperates with standard audio formats such as WAV and FLAC.

Applications include academic research in phonetics and phonology, development and evaluation of voice synthesis systems, clinical assessment of voice disorders, and advanced voice-enabled applications where glottal dynamics are relevant.

History and licensing: Glottisplus arose from a collaboration of universities and industry partners focused on open, reproducible phonation research. The project’s first public release appeared in the early 2020s and is distributed under an open-source license. It is hosted on major code repositories and maintained by an international community of contributors.

Reception and limitations: The framework has been praised for its modular design and documentation, but some users report a steep learning curve and substantial computational requirements for high-fidelity analyses. Compatibility with non-Latin languages and dialectal variation remains an area of ongoing study.