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Read e-book online A Conceptual Framework for Noise Reduction PDF

By Jacob Benesty, Jingdong Chen

ISBN-10: 3319129546

ISBN-13: 9783319129549

ISBN-10: 3319129554

ISBN-13: 9783319129556

Though noise aid and speech enhancement difficulties were studied for no less than 5 many years, advances in our realizing and the advance of trustworthy algorithms are extra very important than ever, as they help the layout of adapted recommendations for essentially outlined functions. during this paintings, the authors suggest a conceptual framework that may be utilized to the numerous various points of noise aid, providing a uniform strategy
to monaural and binaural noise aid difficulties, within the time area and within the frequency area, and related to a unmarried or a number of microphones. furthermore, the derivation of optimum filters is simplified, as are the functionality measures used for his or her evaluation.

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A Conceptual Framework for Noise Reduction by Jacob Benesty, Jingdong Chen PDF

Even though noise aid and speech enhancement difficulties were studied for no less than 5 a long time, advances in our knowing and the advance of trustworthy algorithms are extra vital than ever, as they aid the layout of adapted suggestions for in actual fact outlined purposes. during this paintings, the authors suggest a conceptual framework that may be utilized to the numerous assorted points of noise aid, delivering a uniform method of monaural and binaural noise relief difficulties, within the time area and within the frequency area, and regarding a unmarried or a number of microphones.

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Extra resources for A Conceptual Framework for Noise Reduction

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65) show how the subband NMSEs and the different subband MSEs are implicitly related to the subband performance measures. We are only interested in complex filters for which Ji [iid (k, n)] ≤ Ji [h(k, n)] < Ji [0L×1 (k, n)] , Jq [0L×1 (k, n)] < Jq [h(k, n)] < Jq [iid (k, n)] . 69) h (k, n)Φin (k, n)h(k, n) < 1. 71) 2 hH (k, n)Φin (k, n)h(k, n) , φV (k, n) where μ(k, n) is a positive real number allowing this compromise. 5 Optimal Filters By minimizing Jμ [h(k, n)] [eq. 71)] with respect to h(k, n), we find the complex optimal filter: ho,μ (k, n) = μ(k, n) μ(k, n)ρxX (k, n)ρH xX (k, n) + −1 Φin (k, n) φV (k, n) ρxX (k, n).

7) where x(t) and v(t) are defined in a similar way to y(t). 10) are the correlation matrices of x(t) and v(t), respectively. 2), we deal with complex random variables. A very important statistical characteristic of a complex random variable (CRV) is the so-called circularity property or lack of it (noncircularity) [3], [4]. A zero-mean CRV, z, is circular if and only if the only nonnull moments and cumulants are the moments and cumulants constructed with the same power in z and z ∗ [5], [6]. , E |z|2 = 0.

Reduction performance. Comparing Figs. 2, we can see that varying the forgetting factor αv can help optimize the performance even when the noise is stationary. 0 αy (= αv ) Fig. 2 Fullband performance of the MVDR filter for different values of the filter length, L, as a function of the forgetting factor αy (= αv ) in the white Gaussian noise. The window size is K = 64 (8 ms) with a 75% overlap and the fullband input SNR is 10 dB. optimized separately in an iterative way, which will be left to the reader’s investigation.

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A Conceptual Framework for Noise Reduction by Jacob Benesty, Jingdong Chen


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