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Adaptive Time-Frequency Resolution for Analysis and Processing of Audio

Filter banks with fixed time-frequency resolution, such as STFT, are a common tool for many audio analysis and processing applications allowing effective implementation via FFT. The major problem with STFT approach is a fixed time-frequency resolution. In this paper, we suggest adaptively varying STFT time-frequency resolution in order to reduce filter bank specific artifacts such as pre-echo while retaining adequate frequency resolution. Several strategies for systematic adaptation of time-frequency resolution are proposed. The introduced approach is demonstrated for problems of spectrograms display, noise reduction, and spectral effects processing.

Authors: Lukin, Alexey; Todd, Jeremy
Affiliations: iZotope, Inc.; Moscow State University(See document for exact affiliation information.)
AES Convention:120 (May 2006) Paper Number:6717 Import into BibTeX
Session Subject:Signal Processing; High Resolution Audio

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