Research And Realization On Speech Recognition Algorithm Based On DSP Platform

Auto Speech Recgnition System (ASRS)'s utility research has been a leading direction in the research of speech recognition for 10 years.Nowadays,most of it's appliances on embedded-systems are speech controling,which makes the complex manual operation easy and convenient.It's one of the most natual mode of communication between human and computer.Meanwhile,the miniaturization of equipment also requests omitting the keyboard to save volume.In this paper,a kind of ASRS design project is dissertated and put forward.The method applied in this paper belongs to the small glossary's isolated words' speech recognition,mainly bases on the algorithm proved by the reference literature,which accomplished the assignment of sampling,extracting,computing,modeling and marking,finally,the result is obtained.The function of this ASRS primarily formed by the software and the hardware.The hardware structured the hardware platform,first,it samples the speech signal through a microphone,then receives the sampled data by a high performance A/D,and transmits the data to the RAM of the DSP.These sampled data,will be processed by the programed algorithm here to output the final result.On the other hand,the software includes programes to implement the algorithm of sampling,pre-processing,forward and backward,training,viterbi and so on.Firstly,these algorithms are simulated in the Matlab,then transplanted to the DSP's CCS platform,to emulated the code on the DSK board.To meet the requirement of the anti-noise property, this paper also discusses a kind of algorithm based on the BSS,and triumphantly simutates the founctions in Matlab.