Ten lectures on wavelets
Speech Communication - Special issue on speech processing in adverse conditions
Generalized cross validation for wavelet thresholding
Signal Processing
Bayesian wavelet denoising: Besov priors and non-Gaussian noises
Signal Processing - Special section on Markov Chain Monte Carlo (MCMC) methods for signal processing
Speech enhancement using hybrid gain factor in critical-band-wavelet-packet transform
Digital Signal Processing
An improved spectral subtraction method for speech enhancement using a perceptual weighting filter
Digital Signal Processing
Perceptual improvement of Wiener filtering employing a post-filter
Digital Signal Processing
Bivariate shrinkage functions for wavelet-based denoising exploiting interscale dependency
IEEE Transactions on Signal Processing
Spectrum estimation by wavelet thresholding of multitaperestimators
IEEE Transactions on Signal Processing
Wavelet thresholding techniques for power spectrum estimation
IEEE Transactions on Signal Processing
IEEE Transactions on Audio, Speech, and Language Processing
IEEE Transactions on Audio, Speech, and Language Processing
IEEE Transactions on Systems, Man, and Cybernetics, Part B: Cybernetics
Wavelet-based Rician noise removal for magnetic resonance imaging
IEEE Transactions on Image Processing
IEEE/ACM Transactions on Audio, Speech and Language Processing (TASLP)
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A reliable speech presence probability (SPP) estimator is important to many frequency domain speech enhancement algorithms. It is known that a good estimate of SPP can be obtained by having a smooth a-posteriori signal to noise ratio (SNR) function, which can be achieved by reducing the noise variance when estimating the speech power spectrum. Recently, the wavelet denoising with multitaper spectrum (MTS) estimation technique was suggested for such purpose. However, traditional approaches directly make use of the wavelet shrinkage denoiser which has not been fully optimized for denoising the MTS of noisy speech signals. In this paper, we firstly propose a two-stage wavelet denoising algorithm for estimating the speech power spectrum. First, we apply the wavelet transform to the periodogram of a noisy speech signal. Using the resulting wavelet coefficients, an oracle is developed to indicate the approximate locations of the noise floor in the periodogram. Second, we make use of the oracle developed in stage 1 to selectively remove the wavelet coefficients of the noise floor in the log MTS of the noisy speech. The wavelet coefficients that remained are then used to reconstruct a denoised MTS and in turn generate a smooth a-posteriori SNR function. To adapt to the enhanced a-posteriori SNR function, we further propose a new method to estimate the generalized likelihood ratio (GLR), which is an essential parameter for SPP estimation. Simulation results show that the new SPP estimator outperforms the traditional approaches and enables an improvement in both the quality and intelligibility of the enhanced speeches.