Pitch synchronous multi-band (PSMB) speech coding

A novel speech coding algorithm, named pitch synchronous multiband (PSMB), is proposed. It uses the multiband excitation (MBE) model to generate a representative pitch-cycle waveform (PCW) for each frame. The representative PCW of a frame is encoded by two out of three codebooks depending upon whether the frame is related or unrelated to the previous frame. The new speech coder introduces a pitch-period-based coding feature. The PSMB coder operating at 4 kbps outperforms the Inmarsat 4.15 kbps IMBE coder by a clear margin. It is also found to be slightly better than the FS1016 4.8 kbps code excited linear predictive (CELP) coder in terms of perceptual quality. Fast search algorithms for the three codebooks used in PSMB are also developed