基于自適應(yīng)比特分配的DAM聲碼器
An improved dam vocoder based on adapting BIT allocation
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摘要: 在對離散幅度多分辨率語音編碼方案研究的基礎(chǔ)上提出了改進(jìn)算法。該算法通過對編碼幅度值統(tǒng)計(jì)分析使用了新的編碼格式，并應(yīng)用了縮進(jìn)式比特自適應(yīng)分配機(jī)制，理論分析和實(shí)驗(yàn)結(jié)果表明,改進(jìn)的編碼算法可以在相同語音質(zhì)量的條件下進(jìn)一步降低比特率。
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關(guān)鍵詞:
- 離散幅度多分辨率分析（DAM）; 自適應(yīng)比特分配; 聲碼器
Abstract: An improved method is presented on the base of the study for the discrete-amplitude multi-resolution speech coding. New coding format is adopted through statistical analysis for signal amplitude. Then the indented adapting bit allocation is employed. Theoretical analysis and experimental results show that improved coding method can farther reduce the coding rate maintaining the same speech quality. -
Sun Hong, Yao Tianren, On discrete-amplitude signal analysis and its applications, Science in China (Series E), 1997, 40(3), 243-249.[2]Xu Qiang, Sun Hong, Yao Tianren, Application of discrete amplitude multi-resolution analysis to speech coding, Proc. of ICSP98, Beijing, Oct. 1998, 547-551.[3]J.H. Chen, R. V. Cox, Y. C. Lin, N. Jayant, M. J. Meldner, A low-delay CELP coder for the CCITT 16kb/s speech coding standard, IEEE Jounal on Selected Arcas in Communications,1992, 10(5), 830-849.[4]姚天任,數(shù)字語音處理,武漢,華中理工大學(xué)出版社,1992,356-364. -
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