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(biāo)簽： Foundations Science Data of
上傳時(shí)間： 2020-06-10
上傳用戶：shancjb
基于TMS320F28335的超聲波流量計(jì)硬件原理圖+軟件源碼本文以TMS320F28335 處理器為核心，設(shè)計(jì)一種用于管道流量測(cè)量的超聲波流量計(jì)。系統(tǒng)硬件由核心板，超聲波發(fā)射和接收電路，切換電路，超聲換能器，基于ADS805 的高速信號(hào)采集電路，人機(jī)交互以及電源等模塊構(gòu)成。采用時(shí)差法進(jìn)行管道流量測(cè)量，時(shí)差測(cè)量采用SCOT 加權(quán)的廣義互相關(guān)時(shí)延估計(jì)算法。本論文設(shè)計(jì)的超聲波流量計(jì)具有測(cè)量速度快、準(zhǔn)確性好、成本低等優(yōu)點(diǎn)。關(guān)鍵字：C2000，超聲波，流量，廣義互相關(guān)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(biāo)簽： tms320f28335 超聲波流量計(jì)
上傳時(shí)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(shí)間： 2022-06-20
上傳用戶：
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
標(biāo)簽： 4g 移動(dòng)通信
上傳時(shí)間： 2022-07-08
上傳用戶：
VIP專(zhuān)區(qū)-嵌入式/單片機(jī)編程源碼精選合集系列（117）資源包含以下內(nèi)容：1. (1)可以實(shí)時(shí)顯示當(dāng)前時(shí)間。 (2)可以用鍵盤(pán)設(shè)定多個(gè)預(yù)定打鈴時(shí)間。 (3)學(xué)有余力的同學(xué)可以增加語(yǔ)音提示的功能.2. 關(guān)于ARM控制鼠標(biāo)運(yùn)行的C程序 所用IC為L(zhǎng)PC2132等,程序包含接收和發(fā)送數(shù)據(jù)子程序.3. 來(lái)自PhysioNet的心電分析軟件WFDB使用指南.4. 單片機(jī)接口技術(shù)實(shí)用子程序配套源代碼 內(nèi)含關(guān)于串口通信、鍵盤(pán)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(yīng)嵌入式實(shí)時(shí)視覺(jué)監(jiān)督。在開(kāi)發(fā)智能監(jiān)控?cái)z像機(jī)時(shí)這篇論文會(huì)對(duì)研究者又幫助。.7. bootloader源代碼.8. 匯編的雷達(dá)程序代碼.9. 這個(gè)是51的光電隔離設(shè)計(jì)。.10. nios ii在電機(jī)控制中的應(yīng)用.11. CPLD控制的數(shù)據(jù)采集器原理圖.12. 關(guān)于三星的s3c2410芯片的開(kāi)發(fā)板的原理圖.13. 本程序段為mifare one 卡讀寫(xiě)程序的子程序 也是關(guān)鍵程序.14. AT89C2051的設(shè)計(jì)手冊(cè)。.15. 這個(gè)是有關(guān)DS12887的資料,超級(jí)詳細(xì)的..解釋的很明白.16. s3c44b0 bios起動(dòng)源程序.17. 一個(gè)Megaco實(shí)現(xiàn)源代碼.18. FPGA的Nios配合時(shí)如何計(jì)算SDRAM相位的文章.19. This an exercise in using finite state machines.基于ALTERA的DE2開(kāi)發(fā) 平臺(tái).20. 嵌入式微處理器系統(tǒng) 崔光佐 普適計(jì)算與應(yīng)用實(shí)驗(yàn)室 北京大學(xué)現(xiàn)代教育技術(shù)中心 www.uclab.org.21. SST39VF160操作子程序.22. 基于51單片機(jī)的單工呼叫系統(tǒng)詳細(xì)源代碼程序.23. AT91RM9200測(cè)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(tǒng))是Cypress半導(dǎo)體公司生產(chǎn)的包含有8位微處理器核和數(shù)字與模擬混合的信號(hào)陣列芯片.27. 你相學(xué)會(huì)CPLD,FPGA,教程,快速,么,你想使用硬件編程語(yǔ)言么.那就看這個(gè)吧,只要5分鐘.讓你入門(mén).28. S3C2410下LCD驅(qū)動(dòng)程序移植 及GUI程序編寫(xiě) 以一個(gè)實(shí)例來(lái)敘述S3C2410下一個(gè)驅(qū)動(dòng)程序的編寫(xiě)（本文的初始化源碼以華恒公司提供的s3c2410fb.c為基礎(chǔ)）及簡(jiǎn)單的GUI程序的編寫(xiě)。.29. s3c44b0 的開(kāi)發(fā)板測(cè)試的所有源代碼及程序?。?！匯編代碼主要完成系統(tǒng)初始化.30. 周立功實(shí)驗(yàn)串口調(diào)試! 周立功實(shí)驗(yàn)串口調(diào)試!.31. 周立功實(shí)驗(yàn)SPI調(diào)試! 周立功實(shí)驗(yàn)SPI調(diào)試!.32. 周立功實(shí)驗(yàn)SSP調(diào)試! 周立功實(shí)驗(yàn)SSP調(diào)試!.33. 周立功實(shí)驗(yàn)定時(shí)器調(diào)試! 周立功實(shí)驗(yàn)定時(shí)器調(diào)試!.34. 周立功實(shí)驗(yàn)PWM調(diào)試! 周立功實(shí)驗(yàn)PWM調(diào)試!.35. PT0611打印機(jī)代碼,可用于學(xué)習(xí)用,如果有需要可以下載.36. Cyclone1C20的Nios開(kāi)發(fā)板完整原理圖Protel格式.37. 尋跡小車(chē)主控程序.38. 語(yǔ)言嵌入式系統(tǒng)編程修煉之道,非常有用的嵌入式開(kāi)發(fā)語(yǔ)言學(xué)習(xí).39. 附件為at91sam9261dk評(píng)估板原理圖,protel99se格式的.40. 51單片機(jī)ADS7846適合用在4線制觸摸屏.
上傳時(shí)間： 2013-06-01
上傳用戶：eeworm
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