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Abstract: With industrial/scientific/medical (ISM) band radio frequency (RF) products, often times users are new to the structure of Maxim's low pin-count transmitters andfully integrated superheterodyne receivers. This tutorial provides simple steps that can be taken to get the best performance out of these transmitters and receivers whileproviding techniques to measure the overall capability of the design.
標(biāo)簽：
ISM
RF
無線電頻率
上傳時(shí)間：
2013-11-02
上傳用戶：yph853211
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針對UHF讀寫器設(shè)計(jì)中，在符合EPC Gen2標(biāo)準(zhǔn)的情況下，對標(biāo)簽返回的高速數(shù)據(jù)進(jìn)行正確解碼以達(dá)到正確讀取標(biāo)簽的要求，提出了一種新的在ARM平臺下采用邊沿捕獲統(tǒng)計(jì)定時(shí)器數(shù)判斷數(shù)據(jù)的方法，并對FM0編碼進(jìn)行解碼。與傳統(tǒng)的使用定時(shí)器定時(shí)采樣高低電平的FM0解碼方法相比，該解碼方法可以減少定時(shí)器定時(shí)誤差累積的影響；可以將捕獲定時(shí)器數(shù)中斷與數(shù)據(jù)判斷解碼相對分隔開，使得中斷對解碼影響很小，實(shí)現(xiàn)捕獲與解碼的同步。通過實(shí)驗(yàn)表明，這種方法提高了解碼的效率，在160 Kb/s的接收速度下，讀取一張標(biāo)簽的時(shí)間約為30次/s。
Abstract:
Aiming at the requirement of receiving correctly decoded data from the tag under high-speed communication which complied with EPC Gen2 standard in the design of UHF interrogator， the article introduced a new technology for FM0 decoding which counted the timer counter to judge data by using the edge interval of signal capture based on the ARM7 platform. Compared with the traditional FM0 decoding method which used the timer timed to sample the high and low level， the method could reduce the accumulation of timing error and could relatively separate capture timer interrupt and the data judgment for decoding， so that the disruption effect on the decoding was small and realizd synchronization of capture and decoding. Testing result shows that the method improves the efficiency of decoding， at 160 Kb/s receiving speed， the time of the interrogator to read a tag is about 30 times/s.
標(biāo)簽：
UHF
FM0
讀寫器
解碼技術(shù)
上傳時(shí)間：
2013-11-10
上傳用戶：liufei
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This white paper discusses how market trends, the need for increased productivity, and new legislation have
accelerated the use of safety systems in industrial machinery. This TÜV-qualified FPGA design methodology is
changing the paradigms of safety designs and will greatly reduce development effort, system complexity, and time to
market. This allows FPGA users to design their own customized safety controllers and provides a significant
competitive advantage over traditional microcontroller or ASIC-based designs.
Introduction
The basic motivation of deploying functional safety systems is to ensure safe operation as well as safe behavior in
cases of failure. Examples of functional safety systems include train brakes, proximity sensors for hazardous areas
around machines such as fast-moving robots, and distributed control systems in process automation equipment such
as those used in petrochemical plants.
The International Electrotechnical Commission’s standard, IEC 61508: “Functional safety of
electrical/electronic/programmable electronic safety-related systems,” is understood as the standard for designing
safety systems for electrical, electronic, and programmable electronic (E/E/PE) equipment. This standard was
developed in the mid-1980s and has been revised several times to cover the technical advances in various industries.
In addition, derivative standards have been developed for specific markets and applications that prescribe the
particular requirements on functional safety systems in these industry applications. Example applications include
process automation (IEC 61511), machine automation (IEC 62061), transportation (railway EN 50128), medical (IEC
62304), automotive (ISO 26262), power generation, distribution, and transportation.
圖Figure 1. Local Safety System
標(biāo)簽：
FPGA
安全系統(tǒng)
上傳時(shí)間：
2013-11-14
上傳用戶：zoudejile
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Abstract: This application note explains how to design an intelligent lighting controller that senses and measures the ambient lightlevel with an ambient light sensor (ALS). Equipped with a real-time clock (RTC), the controller also knows when to turn lighting on oroff at specified times. The system presented in this document can be used to control all luminaires that are mains-supply operated.Controller software is also provided in hex format.
標(biāo)簽：
智能照明控制器
測量
環(huán)境光線
上傳時(shí)間：
2013-11-18
上傳用戶：AbuGe
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隨機(jī)性發(fā)生器、冒泡分類和混洗一組12張牌的演示程序。
Demonstrates the use of a randomizer, bubble-sort and an array to "shuffle" a deck of 12 cards. I put it here for those of you who are trying to figure out how to shuffle with a randomizer without having the same card appear two-or-more times.
標(biāo)簽：
Demonstrates
bubble-sort
randomizer
array
上傳時(shí)間：
2014-01-16
上傳用戶：zhanditian
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解決時(shí)鐘問題，acm競賽題
A weird clock marked from 0 to 59 has only a minute hand. It won t move until a special coin is thrown into its box. There are different kinds of coins as your options. However once you make your choice, you cannot use any other kind. There are infinite number of coins of each kind, each marked with a number d ( 0 <= 1000 ), meaning that this coin will make the minute hand move d times clockwise the current time. For example, if the current time is 45, and d = 2. Then the minute hand will move clockwise 90 minutes and will be pointing to 15.
Now you are given the initial time s ( 0 <= s <= 59 ) and the coin s type d. Write a program to find the minimum number of d-coins needed to turn the minute hand back to 0.
標(biāo)簽：
時(shí)鐘
上傳時(shí)間：
2015-05-21
上傳用戶：rishian
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C-C方法及改進(jìn)的C-C方法重構(gòu)相空間的matlab程序
--------------------------------
性能：
3000數(shù)據(jù)耗時(shí)3分鐘
--------------------------------
參考文獻(xiàn)：
1、Nonlinear dynamics, delay times, and embedding windows.pdf
2、基于改進(jìn)的C-C方法的相空間重構(gòu)參數(shù)選擇4.pdf
--------------------------------
文件夾說明：
1、C_C_Method_luzhenbo2.m - 程序主文件，直接運(yùn)行此文件即可!
2、LorenzData.dll - 產(chǎn)生Lorenz離散數(shù)據(jù)
3、DuffingData.dll - 產(chǎn)生Duffing離散數(shù)據(jù)
4、RosslerData.dll - 產(chǎn)生Rossler離散數(shù)據(jù)
5、ccFunction.dll - 計(jì)算S(m,N,r,t) - 原C-C方法中計(jì)算S(m,N,r,t)，改進(jìn)的C-C方法中計(jì)算S2(m,N,r,t)
6、ccFunction_luzhenbo.dll - 計(jì)算S(m,N,r,t) - 改進(jìn)的C-C方法中計(jì)算S1(m,N,r,t)
--------------------------------
致謝：
此稿本次修改的部分靈感來源于與研學(xué)論壇網(wǎng)友“張文鴿”和“yangfanboy”的討論，在此表示感謝!
標(biāo)簽：
C-C
matlab
3000
程序
上傳時(shí)間：
2015-06-08
上傳用戶：lo25643
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LibTorrent is a BitTorrent library written in C++ for *nix, with a focus on high performance and good code. The library differentiates itself from other implementations by transfering directly from file pages to the network stack. On high-bandwidth connections it is able to seed at 3 times the speed of the official client.
The client uses ncurses and is ideal for use with screen or dtach. It supports saving of sessions and allows the user to add and remove torrents.
標(biāo)簽：
performance
LibTorrent
BitTorrent
library
上傳時(shí)間：
2015-07-24
上傳用戶：冇尾飛鉈
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By Tom Christiansen and Nathan Torkington
ISBN 1-56592-243-3
First Edition, published August 1998.
(See the catalog page for this book.)
Search the text of Perl Cookbook.
Table of Contents
Copyright Page
Foreword
Preface
Chapter 1: Strings
Chapter 2: Numbers
Chapter 3: Dates and times
Chapter 4: Arrays
Chapter 5: Hashes
Chapter 6: Pattern Matching
Chapter 7: File Access
Chapter 8: File Contents
Chapter 9: Directories
Chapter 10: Subroutines
Chapter 11: References and Records
Chapter 12: Packages, Libraries, and Modules
Chapter 13: Classes, Objects, and Ties
Chapter 14: Database Access
Chapter 15: User Interfaces
Chapter 16: Process Management and Communication
Chapter 17: Sockets
Chapter 18: Internet Services
Chapter 19: CGI Programming
Chapter 20: Web Automation
Index
Colophon
標(biāo)簽：
Christiansen
Torkington
published
Edition
上傳時(shí)間：
2014-02-20
上傳用戶：yyq123456789
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* CONSTRAINTS
* This module does not handle data which is considered out of range by the
* application(i.e. fixed constants which represent error condition)
*
* Maximum weight value must be limited to 128 to prevent an overflow
* condition during the calculation.
*
* The internal data type must be large enough to handle the calculations.
* The maximum possible internal value
* = Max Input Value * (weight - 1) + Max Input Value
* If a maximum weight of 128 is used, the internal data type should be 2
* times the size of the input data type.
標(biāo)簽：
CONSTRAINTS
considered
module
handle
上傳時(shí)間：
2015-09-07
上傳用戶：qunquan
