【導讀】基于DSP的音頻信號發(fā)生器的設計及實現畢業(yè)論文。理和實現方法使用TMS320C5402作為數據處理器AT89C51作為控制器引導并控制。DSP芯片采用直接數字合成DDS技術在DSP上建立一個信號發(fā)生器可產生指定頻。率音頻范圍的正弦波方波等信號該信號發(fā)生器所產生的正弦波波形清晰穩(wěn)定性。好調頻調幅功能均由軟件實現本設計主要實現正弦音頻信號發(fā)生器該系統由。DDS模塊單片機控制模塊語音提示輸出運算放大模塊DA轉換模塊幅度控制模塊?，F而且有較好的可擴展性穩(wěn)定性與計算機接口方便。§11系統方案選擇3. §DSK5402開發(fā)板硬件結構4. §89C51的引腳及說明17. §42步長計算查表25. §52單片機程序設計27. 第6章系統調試及測試29. §62把DSP程序轉化成單片機程序35. 等目前單片機系統以價格低廉開發(fā)環(huán)境完備開發(fā)工具齊全應用資料眾多功能強。2RS232通用串口可以與PC機DSP以及其它串行接口設備進行連接傳送數據。4DSP要處理來自RS232和發(fā)向AIC23發(fā)送的數據從而達到采集信息和傳送。模數轉換ADCs和數模轉換ADCs部件支持單通道MIC和雙通道LINEIN兩種輸入

　　

【正文】 point digital signal processor made by Texas Instruments Incorporated which is 16bit word length VC5402 has enhanced Harvard architecture built around one program bus three data buses and four address buses for increased performance and versatility With its flexibility high performance price ratio and low power consumption it can implement many kinds of realtime digital signal processing algorithmPCI interface technology is firstly introduced in the paper including PCI local bus system architecture bus operation and other content Also features and usage of AMCC S5920 used as PCI bus controller in the paper are given Then relevant technologies about DSP are detailed Since VCS402 is taken in the paper features and functions are showed in detailIn chapter 2 the design of this card is illustrated and each function part is showed in detail These function parts are posed of PCI interface circuit DSP and S5920 interface circuit fourchannel synchronization sampling circuit triangular wave output circuit and power supply circuit In chapter 3 design of system software is given which consists of program on DSP driver program and software on PC In chapter 4 the application of this card in Shenzhen Citizenship Center Building Health State Monitoring System is elaborated And at the same time other occasions where the PCI card may be used are introduced Testing on the card indicates its performance is good satisfying the design requirement A general TMS320VC5402 DSP chip based highspeed data acquisition system is discussed in the paper which can be applied in rotating machinery condition monitoring With a PC ISA bus interface the system greatly increases the real time performance of data acquisition and strengthens the performance of data analysis At the same time the system also has some advanced features such as low costhigh performance and easy extensibility The system architecture and the realization of hardware and software are illustrated in detail in the paperTMS320VC5402 DSP chip highspeed and simultaneous sample AD converter AD7865 CPLD chip and other chips are applied in the hardware system Four pieces of AD7865which features are high precision and multichannel synchronous data acquisition are controlled by highspeed operation DSP chip to realize multichannel synchronous data acquisition The key modules of the DSP control program are introduced in the paper including initialization module data acquisition module storage module and transport module etc The collected data are stored into the RAM of the data acquisition card first and then sent to the condition monitoring system by the PC ISA bus interface for future analysis and process The data acquisition system and the puter construct a masterslave structure and realize the concurrent execution among data acquisition calculation and munication The data acquisition system is also applied in a rotating machinery condition monitoring system in the paper With the application to Measuring and contrasting of real signal the result shows the system is effective and feasible Finally conclusions and evaluations about this system are given and the development of the system in the future is also suggested Data acquisition card is the AD interface card which converts the output analog signals of the sensors to the digital signals and transmits the digital signal to the puter The traditional acquisition card is limited in data acquisition and the task of signal processing and analyzing is finished by the puter which leads to the reducing of the real time quality and even users long time waiting in some high real time quality required fields The users consume lots of time to configure the plugged data acquisition card which doesnt have the capabilities of hot plugged and portable The paper designs a portable data acquisition and processing system based on DSP and USB20 which breaks through the only function of sampling data of the traditional acquisition card and realizes processing data on card and have the advantages of hotplugged and portable and be adapt to the field test and measurement environment The digital signal processor bees the preferred utility for realizing digital arithmetic rapidly and precisely relying on its particular hardware and instruction architecture The paper introduces the CPU structureMemory positionPeripheral resources and the addressing modes etc The highspeed data acquisition and processing system requires not only fast and precise digital signal processing ability but also high data transmission bandwidth which can transmit the mass of data to the PC The interface used by the system is the crucial factor of the transmission bandwidth Universal Serial Bus supports transfer rates up to 480 Mbshot pluggedeasy of expansion and full backward patibility Using the USB interface between the data acquisition system and the puter can satisfy this systems transmission bandwidth entirely The paper introduces the feature and protocol of USB and expatiates the design method of the data acquisition and processing system in detail Based on the DSP and USB20 technologies the paper designs a portable and highspeed data acquisition and processing system which consists of inputoutput passage module acquisition and processing module and puter interface module Each module is posed of some electronic ponents and the paper has made detailed hardware designing for each module The software of the system is posed of DSP program the firmwarethe device driver and the host application program The paper introduces the main DSP program and the DMA and the INT2 interrupt service program for systems onechannel and multichannel working mode The systems firmware is designed by the KeilC51 tool The device driver is designed by the Microsofts device drive kits and the application program is