波形内插语音编码中特征波形表达和对齐快速算法

Fast Algorithms on Characteristic Waveform Representation and Alignment in Waveform Interpolation Speech Coding

针对波形内插编码模型中特征波形的表达和对齐算法计算复杂度较高的问题,应用快速傅里叶变换、3 次B样条插值和周期延拓等技术对特征波形表示和对齐2个模块作了相应的改进．改进后的算法是相对独立的,2个模块的复杂度从43．252×106次／s操作降到9．178×106次／s操作．实验结果表明,改进后算法复杂度大幅下降,大大减少了编码器的计算负载,并保持了原有编码器的合成语音质量．

To reduce the computational complexity of characteristic waveform（CW） representation and alignment, improved algorithms for CW representation and CW alignment are proposed in this paper by applying Fast Fourier Transform, cubic B-spline interpolation and period extension. The improved algorithms are correspondingly independent, and their comploxity is reduced from 43.252 million operations per second to 9.178 million operations per second. The experimental results show that the improved algorithms have greatly reduced the computational complexity and kept the same speech quality as original coder.