基于DSK6416的G.723.1语音编解码的实时实现

his paper introduced the real-time implementation of coding and decoding of law bit rate speech algorithm G.723.1 based on Texas Instruments (TI) DSK6416. G.723.1 proposed by ITU-T in 1996 is a dual rate speech algorithm used for media communication, which can work in both 5.3kbit/s and 6.3k bit/s. DSK6416 is a DSP develop kit provided by TI, in which the frequency of high performance fixed point DSP chip is up to 1G HZ. So DSK6416 is suitable for real-time implementation of speech codec. The coding and decoding principle of G.723.1 and the component of DSK6416 were briefly introduced at first. Then the hardware environment and system flow of coding and decoding algorithm of G.723.1 was mainly described. The scheme of transferring speech signal by EDMA was described to reduce the load on DSP core and can be used for multi-channel speech codec. Then the method of optimizing the source C code of G.723.1 was introduced to shortening coding and decoding cycle. Finally, the real-time playing back of speech signal was realized and the sound quality was good.