SOUND ANALYSIS AND SYNTHESIS ADAPTIVE IN TIME AND TWO FREQUENCY BANDS

Marco Liuni (1, 2) , Balazs Peter (3) , Axel Röbel (1)

1 IRCAM - Institut de Recherche et Coordination Acoustique/Musique
2 Dipartimento di Matematica "Ulisse Dini"
3 ARI - Acoustic Research Institute

We present an algorithm for sound analysis and resynthesis with local automatic adaptation of time-frequency resolution. There exists several algorithms allowing to adapt the analysis window depending on its time or frequency location; in what follows we propose a method which select the optimal resolution depending on both time and frequency. We consider an approach that we denote as analysis-weighting, from the point of view of Gabor frame theory. We analyze in particular the case of different adaptive time- varying resolutions within two complementary frequency bands; this is a typical case where perfect signal reconstruction cannot in general be achieved with fast algorithms, causing a certain error to be minimized. We provide examples of adaptive analyses of a music sound, and outline several possibilities that this work opens.

Domaines: Traitement du signal et de l'image [eess.SP]; Traitement du signal et de l'image [eess.SP]

Marco Liuni, Balazs Peter, Axel Röbel. SOUND ANALYSIS AND SYNTHESIS ADAPTIVE IN TIME AND TWO FREQUENCY BANDS. Proc. of the 14th Int. Conference on Digital Audio Effects (DAFx-11), Sep 2011, Paris, France. pp.107-113. ⟨hal-00626914⟩