The Study of a new 600b/s Very Low Bit-Rate Vocoder
Pla Uni · Signal Processing · 2002
In order to meet the need of short-wave narrow-band digital security communication, a new 600b/s speech algorithm is proposed and implemented in this paper. Based on the advanced mixed- excitation low bit-rate speech coding techniques, the algorithm can synthesize fairly satisfactory speech at 600b/s by improving the model structure and parameter coding methods. The results of objective quality test and informal subjective listening test show that the intelligibility and articulation of the algorithm are comparative to that of the traditional 2.4kb/s LPC algorithm. The 600b/s speech algorithm has been successfully implemented on single DSP chip TMS320VC5416.