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Multiband Waveform Interpolation Speech Coding Algorithm at 2.4 kbit/s |
Tang Yi-bin; Huang Rong; Wu Zhen-yang |
School of Information Science and Engineering, Southeast University, Nanjing 210096, China |
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Abstract In the traditional characteristic waveform interpolation speech coding, the high frequency harmonics of the synthetic speech are usually lost, which makes the speech feel noisy, due to the phase information neglect of the characteristic waveform and the whole characteristic waveform alignment. In order to improve the synthetic speech quality, the multiband surd/sonant flag is first introduced. The phase spectrum of the slowly/rapidly evolving waveform is estimated with the waveform interpolation speech coding model depending on the multiband surd /sonant flag. Then the partial characteristic waveform alignment is used in the speech synthesis section and a 2.4 kbit/s multiband waveform interpolation speech coding algorithm is proposed finally. Compared with the traditional characteristic waveform algorithm, the new algorithm can distinctly improve the speech definition. Compared with the standard 2.4 kbit/s MELP algorithm, the synthetic speech quality is also slightly better.
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Received: 24 April 2009
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Corresponding Authors:
Tang Yi-bin
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