Source-filter synthesis

This tutorial describes how you can do acoustic synthesis with Praat. It assumes that you are familiar with the Intro.

1. The source-filter theory of speech production

The source-filter theory (Fant 1960) hypothesizes that an acoustic speech signal can be seen as a source signal (the glottal source, or noise generated at a constriction in the vocal tract), filtered with the resonances in the cavities of the vocal tract downstream from the glottis or the constriction. The Klatt synthesizer (Klatt & Klatt 1990), for instance, is based on this idea.

In the Praat program, you can create a source signal from scratch of from an existing speech signal, and you can create a filter from scratch or extract it from an existing speech signal. You can manipulate (change, adapt) both the source and the filter before doing the actual synthesis, which combines the two.

Source-filter synthesis 1. Creating a source from pitch targets
Source-filter synthesis 2. Filtering a source
Source-filter synthesis 3. The ba-da continuum
Source-filter synthesis 4. Using existing sounds

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© ppgb, July 13, 2005