Speech enhancement using adaptive thresholding based on gamma distribution of Teager energy operated intrinsic mode functions
Yükleniyor...
Dosyalar
Tarih
2019
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Turkiye Klinikleri
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
This paper introduces a new speech enhancement algorithm based on the adaptive threshold of intrinsic mode functions (IMFs) of noisy signal frames extracted by empirical mode decomposition. Adaptive threshold values are estimated by using the gamma statistical model of Teager energy operated IMFs of noisy speech and estimated noise based on symmetric Kullback–Leibler divergence. The enhanced speech signal is obtained by a semisoft thresholding function, which is utilized by threshold IMF coefficients of noisy speech. The method is tested on the NOIZEUS speech database and the proposed method is compared with wavelet-shrinkage and EMD-shrinkage methods in terms of segmental SNR improvement (SegSNR), weighted spectral slope (WSS), and perceptual evaluation of speech quality (PESQ). Experimental results show that the proposed method provides a higher SegSNR improvement in dB, lower WSS distance, and higher PESQ scores than wavelet-shrinkage and EMD-shrinkage methods. The proposed method shows better performance than traditional threshold-based speech enhancement approaches from high to low SNR levels. © TÜBİTAK
Açıklama
Anahtar Kelimeler
Empirical mode decomposition, Gamma distribution, Kullback–Leibler divergence, Speech enhancement, Teager energy, Functions, Probability distributions, Shrinkage, Signal to noise ratio, Speech enhancement, Adaptive threshold values, Adaptive thresholding, Empirical Mode Decomposition, Gamma distribution, Intrinsic Mode functions, Perceptual evaluation of speech qualities, Speech enhancement algorithm, Teager energy, Signal processing
Kaynak
Turkish Journal of Electrical Engineering and Computer Sciences
WoS Q Değeri
Q4
Scopus Q Değeri
Q3
Cilt
27
Sayı
2
