| Autor: |
Holighaus, Nicki, Dörfler, Monika, Velasco, Gino Angelo, Grill, Thomas |
| Rok vydání: |
2012 |
| Předmět: |
|
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1109/TASL.2012.2234114 |
| Popis: |
Audio signal processing frequently requires time-frequency representations and in many applications, a non-linear spacing of frequency-bands is preferable. This paper introduces a framework for efficient implementation of invertible signal transforms allowing for non-uniform and in particular non-linear frequency resolution. Non-uniformity in frequency is realized by applying nonstationary Gabor frames with adaptivity in the frequency domain. The realization of a perfectly invertible constant-Q transform is described in detail. To achieve real-time processing, independent of signal length, slice-wise processing of the full input signal is proposed and referred to as sliCQ transform. By applying frame theory and FFT-based processing, the presented approach overcomes computational inefficiency and lack of invertibility of classical constant-Q transform implementations. Numerical simulations evaluate the efficiency of the proposed algorithm and the method's applicability is illustrated by experiments on real-life audio signals. |
| Databáze: |
arXiv |
| Externí odkaz: |
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