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KMID : 0917520030100030241
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Journal of Speech Sciences
2003 Volume.10 No. 3 p.241 ~ p.250
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Real-time Implementation of Variable Transmission Bit Rate Vocoder Improved Speech Quality in SOLA-B Algorithm & G.729A Vocoder Using on the TMS320C5416
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Abstract
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In this paper, we implemented the vocoder of variable rate by applying the SOLA-B algorithm to the G.729A to the TMS320C5416 in real-time. This method using the SOLA-B algorithm is that it is reduced he duration of the speech in decoding. But the method applied to the existed G.729A and SOLA-B algorithm is caused the loss of speech quality in G.729A which is not reflected about length variation of speech. Therefore the proposed method is encoded according as it is modified the structure of LSP quantization table about the length of speech is educed by using the SOLA-B algorithm. The vocoder of variable rate by applying the G.729A and SOLA-B algorithm is represented the maximum complexity of 10.2MIPS about encoder and 2.8MIPS about decoder in 8kbps transmission rate. Also it is evaluated 7.3MIPS about encoder, 9.9MIPS about encoder in 6kbps and 18.5MIP about encoder, 11.1MIPS about decoder in 4kbps according to the transmission rate. The used memory is about program ROM 9.7kwords, table ROM 4.69kwords, RAM 5.3kwords. The waveform of output is showed by the result of C simulator and Bit Exact. Also, he result of MOS test for evaluation of speech quality of the vocoder of variable rate which is implemented in real-time, it is estimated about about 3.68 in 4kbps.
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