The Study Of Embedded Speech Recognition System Based On Arm

The current speech recognition system is widely adopted PC or server form as the system work platform. This way inevitably have a lot of problem such as large in size, high power consumption, not easy to carry and low practicality. And the general speech recognition system is usually due to noise, reverberation and other actual conditions lead to voice pretreatment process is too complex to be successfully used in the embedded systems. Against the above problems, this paper summarizes the traditional speech enhancement technology foundation, launched the study of embedded speech recognition system, and conduct a series research of the theoretical and technical which involved in the subject, mainly including the following work.First, this paper introduces the development and research of embedded systems and speech enhancement technology in speech recognition, point out the current problems in speech enhancement technology, and discusses the main aspect of this research topic; Then on the basis of introduce several kinds of array microphone array element design, this paper comprehensive analyse the performance indicators of various microphone array speech enhancement program.Secondly, this paper researched one kind of highly effective real-time program under reverberation environment the belt interference noise voice signal enhancement. This method took the array microphone as the front end speech collection equipment, the voice signal which the sampling obtained to each microphone between carries on multi-diameter angle diversity reception processing, through analyzing the phase relation between the voice signal, the multi-beam formation, delay processing of coherent signals and weights combined enhances the signal-to-noise ratio to realize voice signal enhancement processing which obtained to gathering, and through the adjustment weight matrix filters, only if the speech frequency band signal and the noise, then further reduce the noise pollution which possibly introduces.Again, this paper designed the hardware platform for system in detail, and introduced the embedded operating system features and transplant-related knowledge. Based on S3C2440 hardware platform, this paper described in detail the system boot process which is BootLoader and the transplant process of Windows CE 6.0. Subsequently, this paper introduces the overall design of the system software and key detailed study process of speech enhancement algorithm.Finally, a lot of integrated simulation experiment have been done on the system. Then, this paper summarizes the system of various aspects ability and analyses the existent problems, and provides direction and valuable experience for further study.