Utilisation of Wavelet Packet Transform for Speech Signal Coding
Keywords:
Compression, Decomposed, Signal energy, Wavelet Packet Decomposition (WPD), Wavelet Packet Transform (WPT), Zero coefficientsAbstract
In modern communication, effective speech coding is very important. This paper utilises wavelet packet transform (WPT) for speech signal coding. WPT extracts unique features from speech signals. The speech signal is decomposed into small segments, based on decomposition levels. The methodology utilises an audio compression speech technique for speech signals with less space occupation and bandwidth. The WPT method is effective as it takes into consideration different threshold levels, such as global dependent and level dependent. The evaluation of this method was conducted at different threshold levels, with different types of wavelets at different levels of decomposition, from lower to higher. The performance at each threshold is compared using the percentage of zero coefficients and retained signal energy, based on WPT and wavelet packet decomposition (WPD).
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