Zobrazeno 1 - 10
of 28
pro vyhledávání: '"Průša, Zdeněk"'
Finding the best K-sparse approximation of a signal in a redundant dictionary is an NP-hard problem. Suboptimal greedy matching pursuit (MP) algorithms are generally used for this task. In this work, we present an acceleration technique and an implem
Externí odkaz:
http://arxiv.org/abs/2202.12380
Autor:
Průša, Zdeněk, Holighaus, Nicki
Signal reconstruction from magnitude-only measurements presents a long-standing problem in signal processing. In this contribution, we propose a phase (re)construction method for filter banks with uniform decimation and controlled frequency variation
Externí odkaz:
http://arxiv.org/abs/2202.07498
Autor:
Prusa, Zdenek, Holighaus, Nicki
The phase vocoder (PV) is a widely spread technique for processing audio signals. It employs a short-time Fourier transform (STFT) analysis-modify-synthesis loop and is typically used for time-scaling of signals by means of using different time steps
Externí odkaz:
http://arxiv.org/abs/2202.07382
We obtain a characterization of all wavelets leading to analytic wavelet transforms (WT). The characterization is obtained as a by-product of the theoretical foundations of a new method for wavelet phase reconstruction from magnitude-only coefficient
Externí odkaz:
http://arxiv.org/abs/1906.00738
Publikováno v:
ICASSP 2019 - 2019 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Brighton, United Kingdom, 2019, pp. 591-595
Methods based on sparse representation have found great use in the recovery of audio signals degraded by clipping. The state of the art in declipping has been achieved by the SPADE algorithm by Kiti\'c et. al. (LVA/ICA2015). Our recent study (LVA/ICA
Externí odkaz:
http://arxiv.org/abs/1810.12204
Publikováno v:
LVA ICA 2018. The 14th International Conference on Latent Variable Analysis and Signal Separation, Guildford, United Kingdom, July 2018
The state of the art in audio declipping has currently been achieved by SPADE (SParse Audio DEclipper) algorithm by Kiti\'c et al. Until now, the synthesis/sparse variant, S-SPADE, has been considered significantly slower than its analysis/cosparse c
Externí odkaz:
http://arxiv.org/abs/1807.03612
Publikováno v:
IEEE Transactions on Audio, Speech and Language Processing, Vol. 25 (5), pp. 1154 - 1164 (2017)
A non-iterative method for the construction of the Short-Time Fourier Transform (STFT) phase from the magnitude is presented. The method is based on the direct relationship between the partial derivatives of the phase and the logarithm of the magnitu
Externí odkaz:
http://arxiv.org/abs/1609.00291
Autor:
Průša, Zdeněk
Dizertační práce se zabývá algoritmy SegDWT pro segmentový výpočet Diskrétní Waveletové Transformace – DWT jedno i vícedimenzionálních dat. Segmentovým výpočtem se rozumí způsob výpočtu waveletové analýzy a syntézy po nezáv
Externí odkaz:
http://www.nusl.cz/ntk/nusl-233573
Many audio applications rely on filter banks (FBs) to analyze, process, and re-synthesize sounds. To approximate the auditory frequency resolution in the signal chain, some applications rely on perceptually motivated FBs, the gammatone FB being a pop
Externí odkaz:
http://arxiv.org/abs/1601.06652
Autor:
Průša, Zdeněk
This diploma thesis deals with digital image lossy compression. Lossy compression in general inserts some kind of distorsion to the resulting image. The distorsion should not be interupting or even noticable in the better case. For image analysis the
Externí odkaz:
http://www.nusl.cz/ntk/nusl-217433