An odd-DFT based approach to time-scale expansion of audio signals

Author

Ferreira, Aníbal J S

Author_Institution

Dept. of Electr. & Comput. Eng., Porto Univ., Portugal

Volume

7

Issue

4

fYear

1999

fDate

7/1/1999 12:00:00 AM

Firstpage

441

Lastpage

453

Abstract

A new time-scale expansion algorithm based on a frequency-scale modification approach combined with time interpolation is presented. The algorithm is noniterative and is constrained to a blind modification of the magnitudes and phases of the relevant spectral components of the signal, on a frame-by-frame basis. The resulting advantages and limitations are discussed. A few simplified models for signal analysis/synthesis are developed, the most critical of which concern phase and frequency estimation beyond the frequency resolution of the filterbank. The structure of the algorithm is described and its performance is illustrated with both synthetic and natural audio signals

Keywords

audio coding; channel bank filters; discrete Fourier transforms; filtering theory; frequency estimation; frequency-domain analysis; interpolation; phase estimation; signal synthesis; spectral analysis; audio coder; audio signals; blind modification; filterbank; frequency estimation; frequency resolution; frequency-scale modification; natural audio signals; noniterative algorithm; odd-DFT based approach; phase estimation; signal analysis/synthesis models; signal magnitude; signal phase; spectral representation; synthetic audio signals; time interpolation; time-scale expansion algorithm; Filter bank; Frequency conversion; Frequency domain analysis; Frequency estimation; Frequency synthesizers; Interpolation; Signal analysis; Signal processing; Signal synthesis; Speech;

fLanguage

English

Journal_Title

Speech and Audio Processing, IEEE Transactions on

Publisher

ieee

ISSN

1063-6676

Type

jour

DOI

10.1109/89.771312

Filename

771312