Title :
Real-time implementation of 2400/1200 bps enhanced MBE vocoder
Author :
Xiongwei, Zhang ; Jiang Bingxin ; Xianzhi, Chen
Author_Institution :
Nanjing Inst. of Commun. Eng., China
Abstract :
This paper presents an enhanced multiband excitation (MBE) speech coding algorithm which can synthesize high quality speech at low bit rates of 2400 bps and 1200 bps. The new algorithm improves the pitch detection, spectrum amplitude calculation, and especially the voiced/unvoiced decision. Computer simulation results show that the synthesized speech at 2400 bps has very high intelligibility and good naturalness, and at 1200 bps, the speech quality is basically equivalent to that of 2400 bps LPC-10e, and also keeps a little naturalness. The algorithm has been implemented on single TMS320C31, the result is also very satisfactory
Keywords :
decision theory; digital signal processing chips; real-time systems; speech coding; speech intelligibility; speech synthesis; vocoders; 1200 bit/s; 2400 bit/s; TMS320C31; enhanced MBE vocoder; enhanced multiband excitation speech coding algorithm; high quality speech; intelligibility; low bit rates; naturalness; pitch detection; real-time implementation; spectrum amplitude calculation; speech quality; synthesized speech; voiced/unvoiced decision; Bit rate; Computer simulation; Encoding; Frequency conversion; Linear predictive coding; Narrowband; Speech coding; Speech recognition; Speech synthesis; Vocoders;
Conference_Titel :
Signal Processing, 1996., 3rd International Conference on
Conference_Location :
Beijing
Print_ISBN :
0-7803-2912-0
DOI :
10.1109/ICSIGP.1996.567363
