Download E-books Pitch Determination of Speech Signals: Algorithms and Devices (Springer Series in Information Sciences) PDF

Pitch (i.e., primary frequency FO and basic interval TO) occupies a key place within the acoustic speech sign. The prosodic info of an utterance is predominantly made up our minds by means of this parameter. The ear is extra delicate to adjustments of basic frequency than to adjustments of different speech sign parameters by way of an order of importance. the standard of vocoded speech is basically encouraged through the standard and faultlessness of the pitch degree­ ment. consequently the significance of this parameter necessitates utilizing strong and trustworthy size equipment. at the beginning look the duty appears easy: one simply has to notice the funda­ psychological frequency or interval of a quasi-periodic sign. For a few purposes, notwithstanding, the duty of pitch selection needs to be counted one of the such a lot tricky difficulties in speech research. 1) In precept, speech is a nonstationary method; the short-term place of the vocal tract may perhaps swap suddenly at any time. This ends up in drastic diversifications within the temporal constitution of the sign, even among next pitch classes, and assuming a quasi-periodic sign is frequently faraway from sensible. 2) because of the flexibility of the human vocal tract and the big variety of voices, there exist a large number of attainable temporal constructions. Narrow-band formants at low harmonics (especially on the moment or 3rd harmonic) are an extra resource of trouble. three) For an arbitrary speech sign uttered by way of an unknown speaker, the elemental frequency can range over a variety of nearly 4 octaves (50 to 800 Hz).

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