一種基于予幀聯(lián)合編碼的600b/s低速語音編碼算法
A 600b/s speech coding algorithm based on sub-frame joint coding
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摘要: 為了適應(yīng)無線通信等甚低速語音通信應(yīng)用,文中提出一種基于子幀聯(lián)合編碼的600b/s語音編碼算法。該算法的激勵源采用混合激勵模型,聲道參數(shù)使用幀內(nèi)預(yù)測多級矢量量化進行高效量化,在參數(shù)編解碼時提出了子幀分類聯(lián)合的思想,并在編碼端使用語音增強仰制背景噪聲,解碼端使用后濾波處理來改善語音質(zhì)量,這些方面較傳統(tǒng)LPC算法有了明顯改進。同時,選用TI公司的TMS320VC5416DSP芯片實時實現(xiàn)了該算法。非正式主觀試聽結(jié)果表明,該算法在可懂度、消晰度等方面與傳統(tǒng)的2.4kb/sLPC自法相當(dāng),而速率僅為LPC算法的1/4,是甚低速率的一種良好的編碼方案。
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關(guān)鍵詞:
- 語音編碼; 子幀聯(lián)合編碼; 混合激勵; 線性預(yù)測
Abstract: In order to meet the applications of wireless communication, a new speech algorithm based on sub-frame joint coding is proposed in this paper. This new algorithm improves several aspects such as model structure, LSP quantization and coding. This algorithm has been implemented on TMS320VC5416 DSP processor. Informal listening testing results show that the intelligibility and naturalness performances of the 600b/s speech coding algorithm are close to those of the 2.4kb/s LPC algorithm, while the rate is only 1/4 of LPC algorithm. -
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