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.
标签： Foundations Science Data of
上传时间： 2020-06-10
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基于TMS320F28335的超声波流量计硬件原理图+软件源码本文以TMS320F28335 处理器为核心，设计一种用于管道流量测量的超声波流量计。系统硬件由核心板，超声波发射和接收电路，切换电路，超声换能器，基于ADS805 的高速信号采集电路，人机交互以及电源等模块构成。采用时差法进行管道流量测量，时差测量采用SCOT 加权的广义互相关时延估计算法。本论文设计的超声波流量计具有测量速度快、准确性好、成本低等优点。关键字：C2000，超声波，流量，广义互相关算法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
标签： tms320f28335 超声波流量计
上传时间： 2022-05-06
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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.
上传时间： 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
上传时间： 2022-07-08
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VIP专区-嵌入式/单片机编程源码精选合集系列（117）资源包含以下内容：1. (1)可以实时显示当前时间。 (2)可以用键盘设定多个预定打铃时间。 (3)学有余力的同学可以增加语音提示的功能.2. 关于ARM控制鼠标运行的C程序 所用IC为LPC2132等,程序包含接收和发送数据子程序.3. 来自PhysioNet的心电分析软件WFDB使用指南.4. 单片机接口技术实用子程序配套源代码 内含关于串口通信、键盘控制、液晶显示等功能的源码.5. Boot code for ADM5120 with serial console for Edimax router..6. 论文名字为：多模式自适应嵌入式实时视觉监督。在开发智能监控摄像机时这篇论文会对研究者又帮助。.7. bootloader源代码.8. 汇编的雷达程序代码.9. 这个是51的光电隔离设计。.10. nios ii在电机控制中的应用.11. CPLD控制的数据采集器原理图.12. 关于三星的s3c2410芯片的开发板的原理图.13. 本程序段为mifare one 卡读写程序的子程序 也是关键程序.14. AT89C2051的设计手册。.15. 这个是有关DS12887的资料,超级详细的..解释的很明白.16. s3c44b0 bios起动源程序.17. 一个Megaco实现源代码.18. FPGA的Nios配合时如何计算SDRAM相位的文章.19. This an exercise in using finite state machines.基于ALTERA的DE2开发 平台.20. 嵌入式微处理器系统 崔光佐 普适计算与应用实验室 北京大学现代教育技术中心 www.uclab.org.21. SST39VF160操作子程序.22. 基于51单片机的单工呼叫系统详细源代码程序.23. AT91RM9200测试程序.24. TGLCMLIMIT64A接口程序（模拟方式）.25. Version Management with CVS.26. PSoC(可编程片上系统)是Cypress半导体公司生产的包含有8位微处理器核和数字与模拟混合的信号阵列芯片.27. 你相学会CPLD,FPGA,教程,快速,么,你想使用硬件编程语言么.那就看这个吧,只要5分钟.让你入门.28. S3C2410下LCD驱动程序移植 及GUI程序编写 以一个实例来叙述S3C2410下一个驱动程序的编写（本文的初始化源码以华恒公司提供的s3c2410fb.c为基础）及简单的GUI程序的编写。.29. s3c44b0 的开发板测试的所有源代码及程序！！！汇编代码主要完成系统初始化.30. 周立功实验串口调试! 周立功实验串口调试!.31. 周立功实验SPI调试! 周立功实验SPI调试!.32. 周立功实验SSP调试! 周立功实验SSP调试!.33. 周立功实验定时器调试! 周立功实验定时器调试!.34. 周立功实验PWM调试! 周立功实验PWM调试!.35. PT0611打印机代码,可用于学习用,如果有需要可以下载.36. Cyclone1C20的Nios开发板完整原理图Protel格式.37. 寻迹小车主控程序.38. 语言嵌入式系统编程修炼之道,非常有用的嵌入式开发语言学习.39. 附件为at91sam9261dk评估板原理图,protel99se格式的.40. 51单片机ADS7846适合用在4线制触摸屏.
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