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Teager Energy Operation on Wavelet Packet Coefficients for Enhancing Noisy Speech Using a Hard Thresholding Function

Author(s): Tahsina Farah Sanam | Celia Shahnaz

Journal: Signal Processing : An International Journal
ISSN 1985-2339

Volume: 6;
Issue: 2;
Start page: 22;
Date: 2012;
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Keywords: Teager Energy Operator | Wavelet Packet Transform | Statistical Modeling | Thrsholding Function

In this paper a new thresholding based speech enhancement approach is presented, where thethreshold is statistically determined by employing the Teager energy operation on the Wavelet Packet(WP) coefficients of noisy speech. The threshold thus obtained is applied on the WP coefficients ofthe noisy speech by using a hard thresholding function in order to obtain an enhanced speech.Detailed simulations are carried out in the presence of white, car, pink, and babble noises to evaluatethe performance of the proposed method. Standard objective measures, spectrogram representationsand subjective listening tests show that the proposed method outperforms the existing state-of-the-artthresholding based speech enhancement approaches for noisy speech from high to low levels ofSNR.
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