The circuit design , focuses on the following hardware modules : power structure environments , a / d , d / a inverter , dsp and embedded cpu ' s communication interface , dsp modules , and so on . the problems and the corresponds solutions which found in the design and debug are discussed , too . at last , the software design is presented in detail , including system booting , initialization of dsp registers , drivers for ad converter and system software 在电路模块分析中，重点介绍了电源环境的构建、语音信号采集/回放( a / d 、 d / a )模块的设计、 dsp与嵌入式cpu通信接口设计以及dsp核心部分设计，并给出了在原理图设计、制板与调试过程中总结的经验。
At last compared two hardware realizing project : embedded project and dsp project . base the need of this system , i choose the dsp project . the dsp project adopted tms320vc5409 - 80 as main chip , match with ad converter tlc2558 , power chip tps73hd318 , to be the whole hardware circuit . at the same time realized the interface between speech recognition system and safety testing equipment . because there was some differences between voltage of dsp system and mega128 system , so i discussed how to convert voltage and get the speech recognition sub - system which can suited for original system . because the system get limit speech samples , and in order to ensure the stability of the system , so i add speech identification chip rsc364 as a sub system to ensure the stability of the system 同时实现该语音识别系统与原电器安全性测试系统接口，由于dsp系统与mega128系统存在电平转换的问题，就又将电平转换的方法进行了讨论，得到与原系统匹配的语音识别系统，由于本系统的识别算法获得的语音样本有限，为了确保本语音识别系统的稳定可靠，在语音识别系统中最后加入语音识别专用芯片rsc364作为辅助的语音识别子系统来保证系统的可靠性。
The first part of the paper is designing the testing project for grounding resistance and insulation resistance in a new way . using 16bits ad converter with programmable control amplifier replaced the way which used changing resistance to change measure range . lt is not only improved testing precision and develop the system expediently , but also reduced the area of the circuit boardwith the new way . in order to make the electric implement safety testing system have upstanding expansibility , the software and hardware of the system adopted the modularization design . adopted mcu atmegal28 as a master mcu which control mmi , realtime clock and communication with slaver mcu . atemga8 as the slaver mcu to realize testing function . so it is easy to add or reduce the testing project . the testing implement system has been developed successfully , and the comments for the system is that it has high precision , high expansibility and easy maintain . but considering the electric implement system should have intelligence and humanity abi lity . so this paper bring forward a scheme of electric equipment safety testing embedded system with speech control . after introduce the basic theory of speech recognition , the paper expatiate the characters of this system . the system is a noise conditon , not special people , small glossary , insulation word system . with these characters design the speech recognition as fellow . utilizing cross zero ratio and short energy to ensure jumping - off point and end point ; adopting mfcc as the character parameters of speech recognition ; the character parameters than be recognized by dtw . in order to ensure the credibility of this project , first realized by matlab in computer 在介绍了语音识别的基本原理后，阐述了本系统的特点：本系统是一个噪声环境下非特定人、小词汇量、孤立词的语音识别系统。根据本系统的这些特点设计了如下语音识别方案：利用过零率和短时能量相结合的方式确定语音端点；采用mel频率倒谱系数( mfcc )作为语音识别的特征参数；得到的特征参数最后通过动态时间规整( dtw )的模式识别方法进行识别。为了确保本系统实现方案的可靠性，首先通过计算机利用matlab软件来仿真，在算法仿真实现后又进一步增加环境的复杂性：加上较大的环境噪声、突发性的噪声等，再通过修改参数、修改参考模板、两级识别等各种提高语音识别精度的方法来提广东工业大学工学硕士学位论文高识别率。
The task of realtime display on lcd and the complicated control arithmetic are implemented in this smps system , and a microcontroller with high resolution , high speed , high integration , large memory is necessary . in this paper , the design theory of s / h ware module which forms the smps control module and the design scheme is discussed in detail . in this system , the digital compute - control module is implemented with samsung ’ s high resolution , high integration , arm core microcontroller s3c44b0 and ad converter with 16bit resolution produced by ad company , ad7705 . the ad7705 implements the data acquisition of the voltage and current feedback signal , and transfer the data to microcontroller through spi bus , which is implemented with s3c44b0 ’ s gpio , for computation and display 本开关电源系统不仅完成lcd的实时显示,还要完成复杂控制算法,需要高速度、高精度、高集成度、大存储空间的微控制器的支持。本文详细的论述了构成电源控制模块的各个软硬件模块的设计原理和设计方案。本系统提出了以samsung公司的高速度、高集成度的基于arm架构的微控制器s3c44b0与ad公司具有16位分辨率的模数转换器ad7705芯片构成数字采集运算控制模块。
Firstly , the system has a good snr and high accuracy , which is owed to wideband operational amplifier being used , accurate adjustment by da , 12 - bit high sampling ad converter being applied . secondly , data transmission becomes less by using forecasting code technology and dictionary compress technology , which are run by dsp on board 本采集系统采用400mhz增益带宽积的运算放大器，运用da高精度校准技术，并选用高采样率低噪声的12位ad转换芯片进行模拟电路和ad转换电路设计，既保证了数据采集系统的信噪比，又提高了系统测量精度。
In the description of circuit design , the emphasis is paid the following hardware modules : ad / da inverter , dsp module , external program / data memory , cpld control logic , serial communication module , power module , and so on . problems and the corresponding solutions found in the design and debug stage are discussed , too . finally , the low - level software driver design is presented in detail , including system booting , initialization of dsp registers , cpld logic and timing control , drivers for asynchronous communication fifo , and drivers for ad converter 在电路模块分析中，重点介绍了语音的输入放大和输出缓冲部分、 ad da转换、 dsp语音压缩解压、外部程序数据存储器、 cpld逻辑控制、串行收发组件、电源供电以及dsp的jtag接口等等，并且给出了在硬件电路设计和调试过程中的问题与解决办法。
