Praat is opensourcesoftware to analyze and manipulate speech on signal level. Moreover you can create images with it, for example of the speech signal and of spectrograms. The source code of the program is released under GPL. Praat is extensively used within language and communication science.

TLA-team: PRAAT is an outstanding tool for speech analysis combining many extremely useful algorithms. It can be highly recommended.

www.praat.org

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