Restoration of hyperbaric speech by correction of the formants and the pitch

This paper describes an hyperbaric speech processing algorithm combining a restoration of the formants position and a correction of the pitch. The pitch is corrected using an algorithm of time-scale modification associated to an oversampling module. This operation does not only perform a shift of the fundamental frequency, but induces a shift of the other frequencies of the signal. This shift, as well as the formants shift due to the hyperbaric environment, is corrected by the formants restoration module, based on the linear speech production model.