B. García, J. Vicente, I. Ruiz, E. Loyo, and A. Alonso (Spain)
Signal processing esophageal speech, pitch scaling and jitter reduction, sonority detection
In this paper it is described a new processing for esophageal speech regeneration, based on pitch and jitter modification. Traditional phase vocoder and resampling pitch scaling techniques have been used to develop a new adaptive method which scales the low esophageal speech pitch and applies a variable scaling factor significantly reducing its jitter. Due to the high level of glottal noise in this kind of voices, it is necessary to include in any regeneration model as a preprocessing which deletes this noise. When trying to delete noise from the speech signal, spectral subtraction techniques are not valid due to a double reason, on the one hand the high level of noise present on these signals, and on the other hand the weakness of the harmonics. It is needed a new technique that allows to eliminate glottal noise, which seriously difficults later processing of this speech.
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