In human speech production and perception interesting questions arise. Do we run against the limitations of the articulatory system f.i. in fast speech, and are we able to make good use of local context, such as formant transitions, to optimize speech understanding?
For ASR it is hard to properly interpret this variation under variable conditions, just as it is hard for TTS to properly generate these speech dynamics for reaching high intelligibility and greater naturalness.
Speakers with a speech handicap can get effective feedback about their speech quality with appropriate acoustic measures. This leads to interesting applications in rehabilitation programs. One also wonders how many of the cochlear implant users can process speech dynamics so well, despite deviant speech processing.
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