title: Quad-band excitation for low bit rate speech coding.
abstract: The excitation parameters of a multiband excitation model for speech production consist of a pitch period and a series of voiced/unvoiced (v/uv) decisions for a number of fixed frequency bands around the harmonics of the fundamental. In this paper, it is shown that, at most, four v/uv variable-length nonoverlapping frequency bands spanning over the telephone bandwidth are adequate to represent the excitation spectrum that provides an improved modeling of mixed voicing and noisy speech. A quad-band excitation (QBE) method is presented which generates excitation source for a linear prediction vocoder for low bit rate transmission of speech signal and the DRT scores validate the potential of the method.
authors.affiliation: Department of Electronic Engineering, Chinese University of Hong Kong, Shatin, N.T.
authors.forename: K M
authors.initials: KM
authors.lastname: Chiu
authors.forename: P C
authors.initials: PC
authors.lastname: Ching
mesh_terms: D006801:Humans; D008962:Models, Theoretical; D013060:Speech; D013061:Speech Acoustics; D013068:Speech Production Measurement; D014831:Voice