A new parametric approach of APC coding
نویسندگان
چکیده
A new method of parametrio ooding at medium output rate is introduoed. The availability of new eleotronio oomponents ohanges the hypotheses assumed in previous studies. A parametrio ooding soheme with medium output rate is rendered feasible for rulebased synthesis, like for voioe-mailing systems. The weak spot in most of the parametrio synthesizers lies in the distinotion made between voioed and unvoioed sounds. Our approaoh oonsists in ooding, in the frequenoy domain, the residual signal of a linear prediotion analysis. We extraot oharaoteristios such as the presenoe of an harmonio struoture, its period, the presenoe of an underlying or predominant noise, the determination of misoellaneous shape faotors ... This parametrio, frame based, representation of the residual signal, assooiated with the linear prediotion ooeffioients, is used for transmission or storage purposes. The synthesizer first reoonstruots the speotrum from these parameters. After a Fast Fourier Transform, this signal drives the signal prediotion filter. The use of appropiately-weighted windows smoothes the frame-to-frame transition. This method does not require any distinotion between voioed and unvoioed sounds while providing a more disoriminative representation and preserving flexibility of parametrio ooding systems. Uni versi te de Liege, Service d 'Acoustique Appliquee, Institut Montefiore, b~t. B-28, B-4000 Sart-Tilman, BELGIQUE
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