摘要
针对波形内插(Waveform Interpolation,WI)语音编码的特征波形分解问题,本文首先提出了基于离散余弦变换(Discrete Cosine Transform,DCT)的特征波形分解方法,避免了复杂的特征波形对齐运算;其次,针对WI的相位重建问题,提出了清/浊音相位判决和浊音相位分类的方法,提高了重建语音质量;最后,分别构建了速率为2.0kbps和1.6kbps的DCT-WI声码器.主观MOS分表明,2.0kbps的DCT-WI声码器质量优于2.4kbps MELP声码器,1.6kbps的DCT-WI声码器亦取得了良好的听觉效果.
Characteristic waveform （CW） decomposition based on discrete cosine transform （DCT） is proposed firstlyin waveform interpolation （WI） speech coding. The complicated CW alignment operation is cancelled by using this method. Secondly, a new unvoiced/voiced phase decision method and the classification method of voiced phase are proposed with respect to phase reconstruction.Finally,DCT-WI coders at 2.0kbps and 1.6kbps are designed, respectively. The subjective MOS test results indicate that the 2.0kbps DCT-WI coder outperforms 2.4kbps MELP coder and the 1.6kbps DCT-WI coder also has a good performance.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2009年第7期1599-1605,共7页
Acta Electronica Sinica
基金
北京市教委科技发展项目(No.KM200710005001)
国家自然科学基金(No.60372063)
北京市自然科学基金(No.4042009)
关键词
语音编码
波形内插
特征波形
离散余弦变换
特征波形对齐
相位重建
speech coding
waveform interpolation
characteristic waveform
discrete cosine transform
alignment of characteristic waveform
phase reconstruction
