This project aim was to build wireless software modem for data communication between two computers using an acoustic interface in the voice frequency range (20Hz– 20,000Hz). The transmitting antenna is a speaker (frequency response of: 90Hz – 20,000Hz) and the receiving antenna is a microphone (frequency response of: 100Hz – 16,000Hz). The test files used as information files were text files. This goal was attained both in an incoherent scheme and in a coherent scheme. Build under Matlab code, our modem uses OFDM (orthogonal frequency division multiplexing) modulation, synchronization by LMS sequence, channel estimation (no equalizer) via pilot tones. The symbols are either PSK or ASK for a constellation size of 2 or 4. To optimize the probability of error, these symbols were mapped using Gray mapping. Report
标签： communication computers software wireless
上传时间： 2014-05-29
上传用户：wangdean1101
Open Flash Chart is a program for creating charts in Flash to display in Web pages. You can create bar, line, area, and pie charts. It also includes server side classes to help generate the data file used as input. At the moment, there are classes for PHP, Perl, .NET, Java, Ruby (and Rails), and Python
标签： Flash creating display program
上传时间： 2014-01-15
上传用户：fandeshun
basic.c */ /**//* Project:NeuroBasic, basic package*//**/ /* Survey:This is a simple Basic b-code compiler which*/ /*can be used as a comfortable command shell for */ /* any program. The actual compiler is found in */ /*compiler.c.*/ /*The functions m_fctptr() and user_server()*/ /*build an interface to an
标签： basic NeuroBasic Project package
上传时间： 2017-02-15
上传用户：xymbian
该程序用以查找任意两个整数之间的所有素数。 Prime number finder can find all primes between a and b and will write the results to the file PRIMES.TXT
上传时间： 2014-01-14
上传用户：cccole0605
随着光伏发电系统快速发展,以及电动汽车充电桩的普及,传统的剩余电流保护器无法满足实际需求。介绍了一款B型剩余电流保护器,采用磁调制剩余电流互感器和零序电流互感器采集剩余电流。根据GB/T 22794—2017标准要求,可识别1 kHz及以下的正弦交流、带和不带直流分量的脉动直流、平滑直流等剩余电流信号。经信号调理电路将电压信号送到单片机进行采集和判断。通过试验测试,该样机在测试精度和速度上均符合国家标准的相关要求。The rapid development of photovoltaic power generation systems and the popularity of electric vehicle charging piles make the traditional residual current protective devices unable to meet the actual demand.This paper proposed a type B residual current protective device,which uses the magnetically modulated residual current transformer and the zero sequence current transformer to acquire the residual current.According to the requirements of GB/T 22794—2017,the type B residual current protective device can detect sinusoidal AC residual current of 1kHz and below 1kHz,pulsating DC residual current with and without DC component,smooth DC residual current and so on.The signal processing circuit sends the voltage signal to the MCU for acquisition and judgment.Through experimental tests,the device meets the relevant requirements of national standards in terms of test accuracy and speed.
标签： 电流保护器
上传时间： 2022-03-27
上传用户：
21世纪大学新型参考教材系列 集成电路B 荒井
上传时间： 2013-04-15
上传用户：eeworm
家电维修(最基础的教程B)1-20.Torrent
上传时间： 2013-06-10
上传用户：eeworm
jk-b交通信号控制机原理图
上传时间： 2013-07-13
上传用户：eeworm
专辑类-实用电子技术专辑-385册-3.609G jk-b交通信号控制机原理图-1.3M.zip
上传时间： 2013-08-02
上传用户：zhf1234
专辑类-电子基础类专辑-153册-2.20G 21世纪大学新型参考教材系列-集成电路B-荒井-159页-2.8M.pdf
上传时间： 2013-05-16
上传用户：pkkkkp
