How should we use the tools , toys , technologies and attitudes of digital to make our idea stickier ? how can our idea become so viral that it ' s positively infectious 我们如何运用数字化的工具、玩具、科技和态度使我们的点子更具粘性?我们的点子怎样能变得更加“病毒化” ,从而更富传染性和感染力?
The technology , status and development of digital to synchro or resolver conversion is expounded in details , some suggestions for the development of its technology and industry are made 摘要综述了数字式自整角机旋转变压器变换技术及国内外现状和发展;提出了该领域的技术和产业发展的建议与设想。
In this thesis , the technology of analog to digital converter ( adc ) and digital to analog converter ( dac ) were reviewed in detail from the perspectives of the modern electronic technology applications , including principles , comparison of characteristics , main technical indicators and applications 摘要本文从现代电子技术应用角度出发,介绍模数和数模转换器的技术,包括工作原理、特性的对比、主要技术指标及发展应用。
In this thesis , firstly , the main protocols and their functions , the application profiles of bluetooth technology are introduced . the hci protocol is analysized emphasesly ; secondly , the 4 - channel 10v analog to digital conversion ( a / d ) bluetooth adapter , 4 - channel 10v digital to analog conversion ( d / a ) bluetooth adapter , rs232 serial port bluetooth adapter are developed . the hardware and software of them are realized and test ; thirdly , the test tool software for bluetooth adapter is designed . the displaying and saving of data with vc + + 6 . 0 multithread in pc is completed , then the wireless serial port communication between pc and micro - controller unit ( mcu ) is implemented , the data results of those adapters are acceeded ; finally , the bit - error - rate testing software of bluetooth communication system is designed , and the bit - error - rate test results of bluetooth adapter in labortary are acquired and illustrated also 其次提出了硬件设计方案:四通道10v模拟/数字( a / d )蓝牙适配器、四通道10v数字/模拟( d / a )蓝牙适配器, rs232串口通信蓝牙适配器。在此基础上完成了硬件电路和软件程序的设计和调试。再次,设计了蓝牙适配器测试工具软件,在pc机上用vc6 . 0 + +多线程编程完成对传输数据的保存与显示,实现了pc机与单片机的串口无线通信,并给出了蓝牙适配器测试结果。
The significant investigation result of this paper are as follows : in the first chapter , we firstly introduce the basic concept and important electrical characteristics of digital to analog converter and bandgap reference , review the historical progress of electric filters , summarize the methodologies and implementing techniques of filters , and then analyze the practical circuits realization of filters and unrealistic impact factors on performance of filters , finally , we set forth significance of this studying problem and main research work of this paper 并将其成功地应用于通信集成电路上,取得了令人满意的实际应用成果。本文的主要研究成果如下:第一章:首先介绍了数模转换器的基本概念及其关键特性指标,接着综述了模拟集成滤波器的发展简史、设计方法和实现技术。然后分析了滤波器实际电路实现及其非理想因素对其性能的影响,阐述了本课题的研究意义以及本文所做的主要研究工作。
The direct digital frequency synthesizer is a kind of fully digitized frequency synthesizer , which consists of the phase accumulator , the sine look - up table , the digital to analog converter and the low band filter . it is of high frequency resolution , fast frequency switching speed , low phase noise , the ability to switch frequencies while maintaining constant phase , and the ability to producing arbitrary waveforms 直接数字频率合成器是一种全数字化的频率合成器,由相位累加器、波形rom 、 d a转换器和低通滤波器构成, dds技术具有频率分辨率高、频率切换速度快、频率切换时相位连续、输出相位噪声低和可以产生任意波形等优点。
High definition digital to analog converter and high performance analog integrated filter among a practical system of communication , during the research work , we gain a lot of new high performance circuits of digital to analog converter and analog integrated filters with enhancement of high characteristics and realization of new structure circuit , which have been successfully applied in communication integrated circuits , and receives better practical application effect 本文紧跟国际学术研究热点,结合一实际通信系统中包括有上述基本单元电路,将对数模转换器、滤波器以及基准源电路的研究重点放在了其高性能指标的提高以及新结构电路的实现上,得到了一系列高性能特性的数模转换器、滤波器和基准电压源电路。
The output circuit of feedback control signal by using a high resolution 16 bit digital to analog converters ( 16 bit dac ) which is kennel of chip dac703j , the data communication interface between microcomputer and computer by using the circuit of the ttl and rs - 232 voltage transform with the chip max232 , are also designed 采用了dac703j芯片为主的高分辨率16位d a转换电路,设计了反馈控制信号输出电路,采用max3232芯片为主的ttl电平与rs - 232电平转换电路,设计了单片机与上级计算机数据通讯接口。
This is by two reasons : the first , as the development of military communication technologies , it transit from digital to software implementation , intelligence , broad band implementation and network implementation . many new technologies such as adaptive frequency hopping , burst communication , broadband modulation and complex coding accelerate the research about pertinence algorithms of signal sense and signal processing . the second , three hotspots of modern signal processing - spectrum estimation , high - order statistics ( hos ) and time - frequency analysis theory become more and more consummately and being used in communication jamming and anti - jamming field 应用于军事通信对抗的信号处理理论发展非常迅速,这得益于两个方面的动力:其一,军事通信的技术和手段不断更新,在数字化的基础上逐步走向软件化、智能化、宽带化和网络化,出现了自适应跳频、突发通信、宽带调制和复杂编码等新的实用技术,推动了具有很强针对性的信号侦测和处理领域的算法研究;其二,现代信号处理的三大热点? ?谱估计、高阶统计量方法、时频分析的理论和技术日臻完善,并逐渐应用于通信对抗领域。
The hardware designing include the interface with engine controller , such as d / a conversion . we chose the ad75089 which was produced by ad corp . this is a parallel port digital to analog conversion , and i give the presentation about its structure and connection scheme . in order to resolve the contradiction between faster computation and slower display , a buffer storage also needed 第二部分详细陈述了高速数据传输卡的软、硬件设计过程,硬件设计包括dsp与pci总线的接口、 dsp与外部控制器的接口、以及电路卡上的扩展数据缓冲区的设计,并使用专门的工具软件protel绘出全部硬件电路的设计原理图。