| 高质量300bit/s声码器算法 |
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| 引用本文： | 李晔,樊燕红,郝秋赟,郭强.高质量300bit/s声码器算法[J].电声技术,2010,34(12):51-53. |
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| 作者姓名： | 李晔 樊燕红 郝秋赟 郭强 |
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| 作者单位： | 山东省计算中心山东省计算机网络重点实验室,山东济南,250014 |
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| 基金项目： | 国家自然科学基金项目(60802030) |
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| 摘 要： | 基于增强型混合激励线性预测模型,提出一种高质量的300 bit/s声码器算法。每个语音帧仅提取少量参数,为提高量化效率,每8个语音帧组成一个超级帧,对超级帧参数进行矢量量化。算法采用基于模式转移的码本映射估计带通浊音度参数,改善其量化精度。对不同带通浊音度模式下的基音参数量化码本尺寸进行联合优化,提高量化效率。同时,对线谱频率参数采用带有级间预测的多级矢量量化以降低谱失真。主观听觉测试表明,此声码器具有较高的可懂度并具有一定的自然度,诊断押韵测试（DRT）的分数为84.2%。
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| 关 键 词： | 语音信号处理 线性预测 矢量量化 级间预测 |
High Quality Speech Coder at 300 bit/s |
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| LI Ye,FAN Yanhong,HAO Qiuyun,GUO Qiang.High Quality Speech Coder at 300 bit/s[J].Audio Engineering,2010,34(12):51-53. |
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| Authors: | LI Ye FAN Yanhong HAO Qiuyun GUO Qiang |
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| Affiliation: | LI Ye,FAN Yanhong,HAO Qiuyun,GUO Qiang(Shandong Provincial Laboratory of Computer Network,Shandong Computer Science Center,Jinan 250014,China) |
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| Abstract: | A vocoder to obtain high quality synthetic speech at 300 bit/s is presented based on mixed excitation linear prediction(MELP) which extracts only few parameters each frame.To obtain high quantization efficiency,vector quantization is performed on parameters of the super-frame composed by eight frames.The quantization efficiency of band pass voicing coefficients(BPVC) is improved based on estimation using code-book mapping over mode transition.Codebook sizes of pitch parameter for different unvoiced/voiced m... |
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| Keywords: | speech signal processing linear prediction vector quantization inter-stage prediction |
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