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The Approach of Speech Bandwidth Expansion Based on Linear Source-Filter

Lin Shengyi;Xiao Zhenghong;School of Computer Science,Guangdong Polytechnic Normal University;  
The wideband speech will become narrowband speech and have worse acoustic quality after transmitted through the communication networks.The bandwidth expansion is an effective way to recover the wideband speech from the narrowband speech.With the linear source-filter based bandwidth expansion implemented in this paper,authors make a comparison between Vector Quantization and Hidden Markov Model.The experiment results show that the wideband speech recovered by the Hidden Markov Model has less audio distortion and higher acoustic quality than the one recovered by Vector Quantization.
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