An Efficient Blockwise Interpolation Algorithm of Prototype Waveform
一种有效的典型波形块内插方法

A new method of prototype waveform extraction and blockwise interpolation in Linear Predictive Residual(LPR) domain was suggested by aligning phase of Pitch-Cycle Wave-form(PCW) along the time axis one by one. This method may avoid the perceptual distortion due to discontinuities near boundaries of interpolated pew. At the same time, it made the boundary selection of Prototype Waveform(PW) not too strict. A novel 2.4 kb/s Linear Predictive Coding(LPC) model was established based on this extraction and blockwise interpolation of PW. The computer simulation results show that the reconstructed speech quality with this model closed to Code-Excited Linear Predictive(CELP) algorithm at 4.8 kb/s.