A modified constant-Q transform for audio signals

The paper proposes a new transform for musical audio signals. The new transform, so-called modified constant-Q fast filter bank (mCQFFB), yields a log-like description in the frequency domain with improved frequency response when compared to the standard DFT. The improved frequency response of the m...

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Bibliographic Details
Main Authors: dos Santos, C.N., Netto, S.L., Biscainho, L.W.R., Graziosi, D.B.
Format: Conference Proceeding
Language:English
Subjects:
Application software
Applied sciences
Channel bank filters
Detection, estimation, filtering, equalization, prediction
Discrete Fourier transforms
Exact sciences and technology
Filter bank
Frequency domain analysis
Frequency response
Information analysis
Information, signal and communications theory
Quantum computing
Signal analysis
Signal and communications theory
Signal representation. Spectral analysis
Signal resolution
Signal, noise
Telecommunications and information theory
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Description
Summary:The paper proposes a new transform for musical audio signals. The new transform, so-called modified constant-Q fast filter bank (mCQFFB), yields a log-like description in the frequency domain with improved frequency response when compared to the standard DFT. The improved frequency response of the mCQFFB is achieved by interpreting the sliding-DFT (sDFT) as a multi-stage filter bank, and substituting the sDFT basic filter in this description by a higher-order filter with improved characteristics. The logarithmic spectral scale of the mCQFFB is achieved by the adequate resampling of a chosen channel filter. We also discuss implementation issues related to the mCQFFB and exemplify its application to the analysis of musical signals.
ISSN:1520-6149
2379-190X
DOI:10.1109/ICASSP.2004.1326296