Title :
Sub-Nyquist Nonuniform Sampling and Perfect Reconstruction of Speech Signals
Author :
Lee, Heyoung ; Bien, Zeungnam
Author_Institution :
Dept. of Control & Instrum. Eng., Seoul Nat. Univ. of Technol., Seoul
Abstract :
The discrete-time speech signals obtained by Nyquist uniform sampling (NUS) have two kinds of redundant samples. One originates from the time-varying instantaneous bandwidth. The other originates from non-compactness of spectral support (SS) in time-frequency domain (TFD). In this paper, the sub- Nyquist nonuniform sampling (SNNS) and the perfect reconstruction (PR) formula are proposed for removing the redundant samples due to the time-varying instantaneous bandwidth (IB) in speech signals. In the proposed method, the instantaneous sampling frequency (ISF) varies, depending on the least upper boundary of spectral support of a speech signal in TFD. The definition of the IB, which determines the ISF and is used for generating the set of samples that represent continuous- time signals perfectly, is given.
Keywords :
signal reconstruction; signal sampling; speech processing; time-frequency analysis; discrete-time speech signals; instantaneous sampling frequency; perfect reconstruction; redundant sample removal; sub-Nyquist nonuniform sampling; time-frequency domain; time-varying instantaneous bandwidth; Bandwidth; Data mining; Frequency domain analysis; Nonuniform sampling; Sampling methods; Signal generators; Signal processing; Signal sampling; Speech analysis; Time frequency analysis;
Conference_Titel :
TENCON 2005 2005 IEEE Region 10
Conference_Location :
Melbourne, Qld.
Print_ISBN :
0-7803-9311-2
Electronic_ISBN :
0-7803-9312-0
DOI :
10.1109/TENCON.2005.301244
