Desktop LockDesktop LockDesktop Lock
标签: LockDesktop Desktop Lock
上传时间: 2013-12-25
上传用户:王小奇
用状态机实现密码锁State machine used to achieve code lock
标签: machine achieve State code
上传时间: 2017-06-21
上传用户:a673761058
source code for finding text in folder files using php simple code
标签: code finding source folder
上传时间: 2013-12-20
上传用户:gdgzhym
Good free software for Folder hiding
标签: software Folder hiding Good
上传时间: 2014-07-04
上传用户:源弋弋
Verilog code for Digital lock
上传时间: 2017-07-08
上传用户:1159797854
Use Dspic30F4011 for design a lock-in Amplifier-Vietnamese
标签: Amplifier-Vietnamese lock-in design Dspic
上传时间: 2014-01-02
上传用户:问题问题
Java数据结构和算法中文第二版源码, The files in this folder, \ReaderFiles\, contain both source code and executable code for the example programs presented in the text of "Data Structures and Algorithms in Java," 2nd Edition. They are available to any reader of the book.
标签: ReaderFiles executable contain folder
上传时间: 2013-12-18
上传用户:huyiming139
how to search for the biggest end folder from your sistem (under Linux)
标签: biggest folder search sistem
上传时间: 2013-12-19
上传用户:TF2015
This is a generic detector that removes some kind of "hide folder" viruses
标签: detector generic removes viruses
上传时间: 2017-09-20
上传用户:familiarsmile
微弱信号检测装置 四川理工学院 刘鹏飞、梁天德、曾学明 摘要: 本设计以TI的Launch Pad为核心板,采用锁相放大技术设计并制作了一套微弱信号检测装置,用以检测在强噪声背景下已知频率微弱正弦波信号的幅度值,并在液晶屏上数字显示出所测信号相应的幅度值。实验结果显示其抗干扰能力强,测量精度高。 关键词:强噪声;微弱信号;锁相放大;Launch Pad Abstract: This design is based on the Launch Pad of TI core board, using a lock-in amplifier technique designed and produced a weak signal detection device, to measure the known frequency sine wave signal amplitude values of the weak in the high noise background, and shows the measured signal amplitude of the corresponding value in the liquid crystal screen. Test results showed that it has high accuracy and strong anti-jamming capability. Keywords: weak signal detection; lock-in-amplifier; Launch Pad 1、引言 随着现代科学技术的发展,在科研与生产过程中人们越来越需要从复杂高强度的噪声中检测出有用的微弱信号,因此对微弱信号的检测成为当前科研的热点。微弱信号并不意味着信号幅度小,而是指被噪声淹没的信号,“微弱”也仅是相对于噪声而言的。只有在有效抑制噪声的条件下有选择的放大微弱信号的幅度,才能提取出有用信号。微弱信号检测技术的应用相当广泛,在生物医学、光学、电学、材料科学等相关领域显得愈发重要。 2、方案论证 针对微弱信号的检测的方法有很多,比如滤波法、取样积分器、锁相放大器等。下面就针对这几种方法做一简要说明。 方案一:滤波法。 在大部分的检测仪器中都要用到滤波方法对模拟信号进行一定的处理,例如隔离直流分量,改善信号波形,防止离散化时的波形混叠,克服噪声的不利影响,提高信噪比等。常用的噪声滤波器有:带通、带阻、高通、低通等。但是滤波方法检测信号不能用于信号频谱与噪声频谱重叠的情况,有其局限性。虽然可以对滤波器的通频带进行调节,但其噪声抑制能力有限,同时其准确性与稳定性将大打折扣。
上传时间: 2013-11-04
上传用户:lty6899826