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Speech enhancement in stationary noise is addressed using the ideal channel selection framework. In order to estimate the binary mask, we propose to classify each time-frequency (T-F) bin of the noisy signal as speech or noise using Discriminative Random Fields (DRF). The DRF function contains two terms - an enhancement function and a smoothing term. On each T-F bin, we propose to use an enhancement...
This paper proposes a new receiver optimized semihard-decision vector quantization (SHDVQ) for noisy channels, as a technique to alleviate the drastic increase in distortion incurred when the output of the classical source optimized vector quantizer (SOVQ) is sent over a noisy channel. The advantages of the proposed method are that it is computationally simple, requires minimal extra storage, and...
Atmospheric turbulence causes fluctuation of the received light signal in free-space optical (FSO) communication links through atmosphere, impairing link performance. The propagation of light wave in atmospheric turbulence was studied, and the received signal was modeled. Then the optimum decision threshold model was derived for FSO communication links using intensity modulation with direct detection...
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