منابع مشابه
Speech Coding with Wavelet Packet Excitation Signal Compression*
Digital speech coding is important problem in the area of network speech applications where there is a necessity of transmission of big amount of data through limited bandwidth channels. Investigations in this field aim at finding new methods for signal compression and compatibility with the network transfer protocols. Digital speech coding involves sampling and amplitude quantization of the sp...
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In this paper, we present a node dependent wavelet thresholding approach in order to remove strongly coloured noises from speech signals. The noise power in each node is first estimated using a recursive method. Given the voiced or unvoiced nature of the frame, the signal is expanded onto a predefined best basis. Then a infinitely smooth soft threshold is applied depending on each node of the d...
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The wavelet packet transform gives information in both the time and frequency domains, and it is very useful for describing nonstationary signals like seismograms. Moreover, this structure is dependent on the signal under study; hence we can choose the time–frequency decomposition more appropriate for every signal. In this article, we propose a new method for filtering based on the wavelet pack...
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The technology of EMG recording is relatively new. There are still limitations in detection and characterization of existing nonlinearities in the surface electromyography (SEMG). Wavelet packets are advance and effective method for analysing signal processing work. EMG signal represents the neuromuscular activities and analysis of EMG signals can lead to diagnose myopathy and neuropathy relate...
متن کاملSpeech Recognition using Wavelet Packet Features
In view of the growing use of automatic speech recognition in the modern society, we study various alternative representations of the speech signal that have the potential to contribute to the improvement of the recognition performance. Specifically, the main targets of the present article are to overview and evaluate the practical importance of some recently proposed, and thus less studied, wa...
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ژورنال
عنوان ژورنال: Energy Procedia
سال: 2011
ISSN: 1876-6102
DOI: 10.1016/j.egypro.2011.12.730