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We propose a novel bandwidth expansion algorithm for extending narrowband speech signal to wideband by exploiting segment examples pre-stored in a speaker independent database. Both narrowband and wideband representation of speech signals are pre-stored in the corpus and they are dynamically chopped into variable length segments. Narrowband segments are used dynamically to explain a given narrowband...
Recently, more and more natural image statistics are found useful for image restoration problems. In this paper, we propose a noise reduction technique by use of color-line assumption for natural color images. Based on the color-line model, we propose an algorithm to analyse local color statistics and recover the original image by promoting color linearity of a local patch. Moreover, the proposed...
Besides noise reduction an important objective of binaural speech enhancement algorithms is the preservation of the binaural cues of both desired and undesired sound sources. Recently, an extension of the binaural Multi-channel Wiener filter (MWF), namely the MWF-IC, has been presented, which aims to preserve the Interaural Coherence (IC) of the noise component. Since for the MWF-IC a substantial...
In most STFT-based speech enhancement algorithms only the STFT amplitude of speech is processed, while the STFT phase of the noisy signal is neither modified nor employed to improve amplitude estimation. This is also, because modifying the spectral phase often yields undesired artifacts and unnatural sounding speech. In this paper, we first obtain a clean speech phase estimate using a recent phase...
A new filter design based on joint diagonalization of the clean speech and noise covariance matrices is proposed. First, an estimate of the noise is found by filtering the observed signal. The filter for this is generated by a weighted sum of the eigenvectors from the joint diagonalization. Second, an estimate of the desired signal is found by subtraction of the noise estimate from the observed signal...
The minimum variance distortionless response (MVDR) beam-former has been widely studied for extraction of desired speech signals in noisy acoustic environments. The performance of this beam-former, however, depends on many factors such as the array geometry, the source incidence angle, the noise field characteristics, the reverberation conditions, etc. In this paper, we study the performance of the...
This paper studies the problem of single-channel noise reduction in the time domain. Based on some orthogonal decomposition developed recently and the squared Pearson correlation coefficient (SPCC), several noise reduction filters are derived. We will show that the optimization of the SPCC leads to the Wiener, minimum variance distortionless response (MVDR), minimum noise (MN), minimum uncorrelated...
The exemplar-based approaches, which model signals as a sparse linear combination of exemplars of signals, are proved to have state-of-the-art performance in noise robust ASR, especially on low SNRs. However, since both the speech exemplars and noise exemplars are built from training data and are fixed throughout the process of enhancing speech features, the conventional approach is especially weak...
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