Computer science as an academic discipline began in the 1960’s. Emphasis was on programming languages, compilers, operating systems, and the mathematical theory that supported these areas. Courses in theoretical computer science covered finite automata, regular expressions, context-free languages, and computability. In the 1970’s, the study of algorithms was added as an important component of theory. The emphasis was on making computers useful. Today, a fundamental change is taking place and the focus is more on a wealth of applications. There are many reasons for this change. The merging of computing and communications has played an important role. The enhanced ability to observe, collect, and store data in the natural sciences, in commerce, and in other fields calls for a change in our understanding of data and how to handle it in the modern setting. The emergence of the web and social networks as central aspects of daily life presents both opportunities and challenges for theory.
標簽： Foundations Science Data of
上傳時間： 2020-06-10
上傳用戶：shancjb
基于TMS320F28335的超聲波流量計硬件原理圖+軟件源碼本文以TMS320F28335 處理器為核心，設計一種用于管道流量測量的超聲波流量計。系統硬件由核心板，超聲波發射和接收電路，切換電路，超聲換能器，基于ADS805 的高速信號采集電路，人機交互以及電源等模塊構成。采用時差法進行管道流量測量，時差測量采用SCOT 加權的廣義互相關時延估計算法。本論文設計的超聲波流量計具有測量速度快、準確性好、成本低等優點。關鍵字：C2000，超聲波，流量，廣義互相關算法AbstractA kind of ultrasonic flowmeter using for the pipe flow measurement is designed based onTMS320F28335 in this paper. The system hardware consists of the following parts: the core board,ultrasonic signal transmitter and receiver circuits, switch circuit, ultrasonic transducer, signalacquisition circuit based on ADS805, human-computer interaction module and power supplymodule, etc. The system use the method of time difference for pipeline flow measurement and thetime difference is calculated by the time-delay algorithm of SCOT weighted generalizedcross-correlation. The ultrasonic flowmeter has the features of high testing speed, high precisionand low cost, etc.Keywords: C2000,Ultrasonic, Flow, Generalized Cross-Correlation Algorithm
標簽： tms320f28335 超聲波流量計
上傳時間： 2022-05-06
上傳用戶：
INTRODUCTION In the past, adding speech recording and playback capability to a product meant using a digital signal processor or a specialized audio chip. Now, using a simplified Adaptive Differential Pulse Code Modulation(ADPCM) algorithm, these audio capabilities can be added to any PICmicro device. This application note will cover the ADPCM compression and decompression algorithms, performance comparison of all PICmicro devices, and an application using a PIC16C72 micro-controller.DEFINITION OF TERMS step size -value of the step used for quantization of ana-log signals and inverse quantization of a number of steps.quantization -the digital form of an analog input signal is represented by a finite number of steps.adaptive quantization -the step size of a quantizer is dramatically changed with time in order to adapt to a changing input signal.inverse quantizer -a finite number of steps is converted into a digital representation of an analog signal.
上傳時間： 2022-06-20
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PrefaceDuring the past years, there has been a quickly rising interest in radio access technologies for providingmobile as well as nomadic and fixed services for voice, video, and data. The difference indesign, implementation, and use between telecom and datacom technologies is also becoming moreblurred. One example is cellular technologies from the telecom world being used for broadband dataand wireless LAN from the datacom world being used for voice-over IP.Today, the most widespread radio access technology for mobile communication is digital cellular,with the number of users passing 5 billion by 2010, which is more than half of the world’s population.It has emerged from early deployments of an expensive voice service for a few car-borne users,to today’s widespread use of mobile-communication devices that provide a range of mobile servicesand often include camera, MP3 player, and PDA functions. With this widespread use and increasinginterest in mobile communication, a continuing evolution ahead is foreseen.This book describes LTE, developed in 3GPP (Third Generation Partnership Project) and providingtrue 4G broadband mobile access, starting from the first version in release 8 and through the continuingevolution to release 10, the latest version of LTE. Release 10, also known as LTE-Advanced,is of particular interest as it is the major technology approved by the ITU as fulfilling the IMTAdvancedrequirements. The description in this book is based on LTE release 10 and thus provides acomplete description of the LTE-Advanced radio access from the bottom up.Chapter 1 gives the background to LTE and its evolution, looking also at the different standardsbodies and organizations involved in the process of defining 4G. It also gives a discussion of the reasonsand driving forces behind the evolution.Chapters 2–6 provide a deeper insight into some of the technologies that are part of LTE and itsevolution. Because of its generic nature, these chapters can be used as a background not only for LTEas described in this book, but also for readers who want to understand the technology behind othersystems, such as WCDMA/HSPA, WiMAX, and CDMA2000.Chapters 7–17 constitute the main part of the book. As a start, an introductory technical overviewof LTE is given, where the most important technology components are introduced based onthe generic technologies described in previous chapters. The following chapters provide a detaileddescription of the protocol structure, the downlink and uplink transmission schemes, and the associatedmechanisms for scheduling, retransmission and interference handling. Broadcast operation andrelaying are also described. This is followed by a discussion of the spectrum flexibility and the associated
上傳時間： 2022-07-08
上傳用戶：
VIP專區-嵌入式/單片機編程源碼精選合集系列（117）資源包含以下內容：1. (1)可以實時顯示當前時間。 (2)可以用鍵盤設定多個預定打鈴時間。 (3)學有余力的同學可以增加語音提示的功能.2. 關于ARM控制鼠標運行的C程序 所用IC為LPC2132等,程序包含接收和發送數據子程序.3. 來自PhysioNet的心電分析軟件WFDB使用指南.4. 單片機接口技術實用子程序配套源代碼 內含關于串口通信、鍵盤控制、液晶顯示等功能的源碼.5. Boot code for ADM5120 with serial console for Edimax router..6. 論文名字為：多模式自適應嵌入式實時視覺監督。在開發智能監控攝像機時這篇論文會對研究者又幫助。.7. bootloader源代碼.8. 匯編的雷達程序代碼.9. 這個是51的光電隔離設計。.10. nios ii在電機控制中的應用.11. CPLD控制的數據采集器原理圖.12. 關于三星的s3c2410芯片的開發板的原理圖.13. 本程序段為mifare one 卡讀寫程序的子程序 也是關鍵程序.14. AT89C2051的設計手冊。.15. 這個是有關DS12887的資料,超級詳細的..解釋的很明白.16. s3c44b0 bios起動源程序.17. 一個Megaco實現源代碼.18. FPGA的Nios配合時如何計算SDRAM相位的文章.19. This an exercise in using finite state machines.基于ALTERA的DE2開發 平臺.20. 嵌入式微處理器系統 崔光佐 普適計算與應用實驗室 北京大學現代教育技術中心 www.uclab.org.21. SST39VF160操作子程序.22. 基于51單片機的單工呼叫系統詳細源代碼程序.23. AT91RM9200測試程序.24. TGLCMLIMIT64A接口程序（模擬方式）.25. Version Management with CVS.26. PSoC(可編程片上系統)是Cypress半導體公司生產的包含有8位微處理器核和數字與模擬混合的信號陣列芯片.27. 你相學會CPLD,FPGA,教程,快速,么,你想使用硬件編程語言么.那就看這個吧,只要5分鐘.讓你入門.28. S3C2410下LCD驅動程序移植 及GUI程序編寫 以一個實例來敘述S3C2410下一個驅動程序的編寫（本文的初始化源碼以華恒公司提供的s3c2410fb.c為基礎）及簡單的GUI程序的編寫。.29. s3c44b0 的開發板測試的所有源代碼及程序！！！匯編代碼主要完成系統初始化.30. 周立功實驗串口調試! 周立功實驗串口調試!.31. 周立功實驗SPI調試! 周立功實驗SPI調試!.32. 周立功實驗SSP調試! 周立功實驗SSP調試!.33. 周立功實驗定時器調試! 周立功實驗定時器調試!.34. 周立功實驗PWM調試! 周立功實驗PWM調試!.35. PT0611打印機代碼,可用于學習用,如果有需要可以下載.36. Cyclone1C20的Nios開發板完整原理圖Protel格式.37. 尋跡小車主控程序.38. 語言嵌入式系統編程修煉之道,非常有用的嵌入式開發語言學習.39. 附件為at91sam9261dk評估板原理圖,protel99se格式的.40. 51單片機ADS7846適合用在4線制觸摸屏.
上傳時間： 2013-06-01
上傳用戶：eeworm
