CONSTRUCTION OF PERCEPTION STIMULI WITH COPY SYNTHESIS
Yves Laprié, Anne Bonneau · 2007
A number of experiments in perception requires the con-struction of speech-like stimuli whose acoustic content needs to be manipulated easily. Formant synthesis of-fers the possibility of editing all the parameters of speech. However, the construction of stimuli by hand is a very la-borious task and therefore automatic tools are necessary. This paper describes two main extensions of a copy syn-thesis algorithm previously proposed. The first concerns formant tracking which relies on a concurrent curve strat-egy. The second is a pitch synchronous amplitude adjust-ment algorithm that enables the capture of fast varying amplitude transitions in consonants. In addition, the au-tomatic determination of the source parameters through the computation of F0 and of the friction to voicing ra-tio enables the speech signals to be copied automatically.