Nonuniform filterbank design for audio signal modeling

Abstract

In audio analysis-synthesis based on the sinusoidal model, the signal can be represented as the sum of a deterministic component, which consists of a sum of sinusoids, and a stochastic component, which is a broadband noiselike process, for instance breath noise in a flute. In coding applications, a signal estimate based solely on the deterministic component is often used. For high-fidelity synthesis, however the stochastic component must also be modeled and incorporated into the signal reconstruction. This paper presents a simple approach for designing a nonuniform filterbank based on the properties of the human auditory system; the short-term energies of the subband signals of the nonuniform filterbank provide an effective parameterization of the stochastic component of the signal model.