CAJ | 학술논문

文中提出一种压缩感知框架采样下的语音编码方案。根据压缩感知原理,利用行阶梯矩阵投影产生的观测序列保留了部分语音信息的时域特征,利用正弦字典和匹配追踪算法对观测序列进行建模,对于每帧观测序列的模型参数,根据各自特性采用合适的编码方式进行编码。在解码端对解码后的观测序列利用基追踪算法重构合成语音,并后置低通滤波器提高合成语音的人耳听觉效果。仿真实验表明,提出的编码方案在2.8~5.7 kbps时得到的合成语音平均MOS分为2.81~3.23,在压缩感知框架下取得了较好的语音编码效果。
문중제출일충압축감지광가채양하적어음편마방안。근거압축감지원리,이용행계제구진투영산생적관측서렬보류료부분어음신식적시역특정,이용정현자전화필배추종산법대관측서렬진행건모,대우매정관측서렬적모형삼수,근거각자특성채용합괄적편마방식진행편마。재해마단대해마후적관측서렬이용기추종산법중구합성어음,병후치저통려파기제고합성어음적인이은각효과。방진실험표명,제출적편마방안재2.8~5.7 kbps시득도적합성어음평균MOS분위2.81~3.23,재압축감지광가하취득료교호적어음편마효과。
A novel speech coding method based on compressed sensing is proposed in this paper. Based on compressed sensing theory,the row echelon matrix retains parts of speech time domain features in the measurements,and utilize a sinusoidal dictionary and matching pur-suit for measurements sequence modeling. The model parameters are encoded by appropriate methods respectively. At the decoder,basis pursuit algorithm employs the decoded measurements for synthesized speech reconstruction. A rear low-pass filter is adopted to improve auditory effects. Simulation results show the average MOS scores of the synthesis speech are between 2. 81~3. 23 in low bit rate (2. 8~5. 7 kbps),which achieves a preferable coding effect in compressed sensing framework.