Aalto Aparat – A freely available tool for glottal inverse filtering and voice source parameterization

Paavo Alku, Hilla Pohjalainen, Manu Airaksinen

Research output: Contribution to conferencePaperScientificpeer-review


A software tool, Aalto Aparat, is introduced for glottal inverse filtering analysis of human voice production. The tool enables using two inverse filtering methods (Iterative adaptive inverse filtering, Quasi closed phase analysis) to estimate the glottal flow from speech. The inverse filtering analysis can be conducted using a
graphical interface either automatically or in a semiautomatic manner by allowing the user to select the best glottal flow estimate from a group of candidates. The resulting glottal flow is parameterized with a multitude of know
parameterization methods. Aalto Aparat is easy to use and it calls for no programming skills by the user. This new software tool can be downloaded as a stand - alone package free of charge to be run on two operating systems
(Windows and Mac OS).
Original languageEnglish
Number of pages8
Publication statusPublished - 2017
MoE publication typeNot Eligible
EventSubsidia: Tools and resources for speech sciences - Malaga, Spain
Duration: 21 Jun 201723 Jun 2017




  • glottal inverse filtering
  • voice source
  • speech research tool


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