GSK980TD串行口通讯软件

用来展示twitter数据采集,当初的事例.

基于MATLAB复调制ZOOM-FFT算法的分析和实现2006年第4期舰船电子工程121滤波;使用函数来实现傅立叶变换次复数乘法。设数字滤波器的阶数为K,滤波器系数离线生成,则滤波需要DNK次复数乘法,则总4 Matlab仿真和验证的运算量为为验证上述算法及分析过程的正确性,在MatZFFTNloN+2N+DN·K(3)中产生一个正弦组合信号3随着细化倍数的增加,基带FFT和ZFFT的运算量x(t)=30cos(2m110t)+30cos(2x11145t)都会大幅度增加;zFF只有当细化频带较窄(此时+25cos(2x112.3t)+48cos(2m113.8t)无需数字滤波)或长序列的情况下,与基带FT相+50co(2x114.5t)比才具有运算量上的优势。分别利用基带FT和ZT对其进行谱分析ZFT算法存在自身的局限性,其存在的问题仿真条件:f=2048H,F点数N=1024,细化倍数D=50。基带FFT的频率分辨率4f=2H,历如下:(1)需要存放中间数据的内存空间巨大限制ZF的频率分辨率△f=0.04H。仿真结果如图了最大细化倍数2和图3所示。(2)采用具有线性相位的FIR数字滤波器实igure(n现抗混叠滤波,由于有限阶滤波器的吉布斯效应( Gibbs effect),滤波器截止频率处的频谱不可避免020040060080010001200会出现局部失真。(3)细化倍数越高,重釆样的选抽比越高,则细化带宽越窄。当需要细化的带宽较大时,必须进5行多次细化,这势必会增加计算量。Figure(4)频率成分调整较复杂。将FT和谱分析105110115130得到的频率成分调整到所选频带的频率成分式较Frequency(Hz复杂的过程,特别是为了避免低通抗混滤波器的边图3FF幅值频谱缘误差造成的频率混叠为了比较频率细化的效果,对图中谱线作了归化处理。图2中fgme(a)为原始信号,fgme(c)6小结为基带FYT处理后的幅值谱线,fgre(d)为移频后ZFT算法的关键在于利用傅立叶变换的移频基带FFT处理后的幅值谱线。由此图可以看出,基特性将感兴趣的高频段频率移至频谱原点,降低采带FFT的几个谱峰叠加为一个谱峰,各频率成分不可分辨。图3中fge(g)为重新采样后F处理样率重新釆样,从而获取较高的频率分辨率。它对后的幅值谱线,gure(h)为频率调整到实际频率处于获得某些特殊频段而不是整个带宽的信号细微的幅值谱线。此图中,因频率分辨率降低了D倍谱结构十分有用。该算法在实际工程技术中有较zF的幅值谱线中5条谱线清晰可见,说明ZF广泛的应用效果明显。参考文獻5ZF运算量和局限性讨论[1]胡广书.数字信号处理-理论、算法与实现[M]北京:清华大学出版社,1997当采用时域抽取FFT算法时,N点DT的复数[2] Vinay K ingle, John g proakis.数字信号处理及其乘法次数为l2N,复数加法次数为NN。为MATLAB实现[M].北京:电子工业出版社,1998[3]赵霞,熊小伏,郭珂.用细化频谱技术分析断路器简单起见,仅比较两种算法的复数乘法次数。操动机构振动信号[J.电力系统自动化,2003,(12):37设频率分辨率4f=fN,细化倍数D=△/404」f。要获得4/的分辨率,基带FFT的运算量为[4]丁康,谢明,张彼德等.基于复解析带通滤波器的FrTdN)lo复调制细化谱分析原理和方法[J.振动工程学报,2001,62(D14(1):30~35采用ZF算法,在复调制时只计算重采样的[5]宗孔德.多抽样率信号处理[M].北京:清华大学点,需N次复数乘法。同样,调制系数的计算也需N出版社,19基于 MATLAB复调制Z00M-FT算法的分析和实现旧WANFANG DATA文献链接作者:王力,张冰,徐伟, Wang li, Zhang bing, Xu Wei作者单位:王力,张冰, Wang Li, Zhang bing(江苏科技大学,镇江,212003),徐伟, Xu Wei(船舶系统工程部,北京,100036)刊名:舰船电子工程英文刊名SHIP ELECTRONIC ENGINEERING年,卷(期)2006,26(4)被引用次数:次参考文献(5条)1.宗孔德多抽样率信号处理19962.丁康;谢明;张彼德基于复解析带通滤波器的复调制细化谱分析原理和方法[期刊论文]振动工程学报2001(013.赵霞;熊小伏;郭珂用细化频谱技术分析断路器操动机构振动信号[期刊论文]电力系统自动化2003(12)4.陈怀琛数字信号处理教程- MATLAB释义与实现19985.胡广书数字信号处理一理论、算法与实现1997本文读者也读过(6条江波.唐普英基于复调制的ZooⅷFFT算法在局部频谱细化中的研究与实现[期刊论文]-大众科技2010(7)2.丁康.谢明.张彼德.赵玲.张晓飞. Ding Kang. Xie ming. Zhang bide. Zhao ling. ZHANG Xiaofei基于复解析带通滤波器的复调制细化谱分析原理和方法[期刊论文]-振动工程学报2001,14(1)3.罗利春. LUo Lic- hun zoom-FFT的改进、频谱反演与时-频局部化特性[期刊论文]-电子学报2006,34(1)4.戴振华.纪海林.徐运涛.DAⅠZhen-hua. JI Hai-1in.ⅫUYun-taoZ00MFFT算法在数字音频分析仪中的实现[期刊论文]-兵工自动化2007,26(10)5.黄镔.许婧.高峰.束洪春Z0OM-FFT在水电机组振动信号分析中的应用[期刊论文]-昆明理工大学学报(理工版)2002,27(5)6.王卫江改进的自适应Zoom-FFT算法研究[期刊论文]一电子技术应用2006,32(7)证文献(10条1.程兆刚.唐力伟.张淑琴.曹洪娜基于复调制Z0OM-FFT算法下阻尼比识别的研究[期刊论文]计算机与数字工程2012(1)2.刘树强.罗天.王宁.潘栋基于 Labview的异步电机转子断条检测[期刊论文]电子设计工程2011(3)3.王文森.邱宏安高精度超声流量检测系统设计[期刊论文]电声技术2011(2)4刘树强.罗天.谭兴文基于 Labview的笼型异步电动机转子断条故障在线检测系统[期刊论文]西南大学学报:自然科学版2011(9)5.王乐.苏小敏.杜林.李春化复白噪声中复正弦波频率估计方法硏究[期刊论文]火控雷达技术2011(36.周红霞.江佩勤.伍洲基于嵌入式系统的ZFFT移频轨道检测算法[期刊论文]通信技术2010(37.焦玮琦.陈特放基于局部频谱细化的轨道移频信号高精度检测[期刊论文]机车电传动2009(28.史瑞根.姚金杰基于 Labview的数字变频FFT设计[期刊论文]现代电子技术2009(7)9武中奇.杨世武丌FT算法在铁路移频信号分析中的应用及其DSP实现[期刊论文]铁道通信信号2008(7)10.时献江.张春喜.邵俊鹏异步电机断条故障诊断的细化包络方法[期刊论文]电机与控制学报2008(2)本文链接http://d.g.wanfangdata.com.cn/periodicaljcdzgc200604033.aspx

devo10刷机文件，支持华科尔devo10遥控器

GB 50157-2013 地铁设计规范

webrtc acem agc ns vad单独编译工程。测试都可以单独使用并测试通过

C++ Primer Plus（第6版）中文版源代码以及习题答案

采用COMSOL软件，对平面变压器的仿真过程进行叙述，让大家了解平面变压器的仿真流程，是个很好的指导教材Solved with COMSOL Multiphysics 5.0Results and discussionThe magnetostatic analysis yields an inductance of 0. 1l mH and a dc resistance of0. 29 mQ2. Figure 2 shows the magnetic flux density norm and the electric potentialdistributionvolume: Coil potentiaL()Volume: Magnetic flux density norm (t▲0.07▲2.88×10-42.51.50.03050.01V656×107v0igure 2: Magnetic flux density norm and electric potential distribution for themagnetostatic analysisIn the static (DC) limit, the potential drop along the winding is purely resistive andcould in principle be computed separately and before the magnetic flux density iscomputed. When increasing the frequency, inductive effects start to limit the currentand skin effect makes it increasingly difficult to resolve the current distribution in thewinding. At sufficiently high frequency, the current is mainly flowing in a thin layernear the conductor surface. When increasing the frequency further. capacitive effectscome into play and current is flowing across the winding as displacement currentdensity. When going through the resonance frequency, the device goes from behavingas an inductor to become predominantly capacitive. At the self resonance, the resistivelosses peak due to the large internal currents Figure 4 shows the surface current3 MODELING OF A 3D INDUCTORSolved with COMSOL Multiphysics 5.0distribution atl MHz. Typical for high frequency the currents are displaced towardsthe edges of the conductor.freq(1)=1.0000E6_Surfaee: Surface-current density norm (A/)▲18618Q16010￥1.02Figure 3: Surface current density at I MHz (below the resonance frequency)Figure 4 shows how the resistive part of the coil impedance peaks at the resonancefrequency near 6MHz whereas Figure 5 shows how the reactive part of the coiimpedance changes sign and goes from inductive to capacitive when passing throughthe resonance4 MODELING OFA3DINDUCTORSolved with COMSOL Multiphysics 5.0Global: Lumped port impedance(Q2)d port impedance7.5G6.583275655545352510.10.20.30.40.509igure 4: Real part of the electric potential distribution5 MODELING OF A INDUCTORSolved with COMSOL Multiphysics 5.0Global: Lumped port impedance(Q2)35000Lumped port impedance200001000050000500010000-1500020000250000.10.20.30.40.50.60.70.809Figure 5: The reactive part of the coil impedance changes sign hen passing through theresonance frequency, going from inductive to capacitiveModel library path: ACDC_Module/Inductive_ Devices_and_coils/inductor 3dFrom the file menu. choose newNEWI In the new window click model wizardMODEL WIZARDI In the model wizard window click 3D2 In the Select physics tree, select AC/DC> Magnetic Fields(mf)3 Click Add4 Click StudyMODELING OF A3D NDUCTORSolved with COMSOL Multiphysics 5.05 In the Select study tree, select Preset Studies>StationaryGEOMETRYThe main geometry is imported from file. Air domains are typically not part of a CaDgeometry so they usually have to be added later. For convenience three additionaldomains have been defined in the CAd file. These are used to define a narrow feed gapwhere an excitation can be appliedport l(impl)I On the model toolbar, click Import2 In the Settings window for Import, locate the Import section3 Click Browse4 Browse to the models model library folder and double-click the filenductor 3d. mphbinSphere /(sphl)I On the Geometry toolbar, click Sphere2 In the Settings window for Sphere, locate the Size section3 In the Radius text field, type 0.2ick to expand the Layers section. In the table, enter the following settingsLayer nameThickness(m)ayer0.055 Click the Build All Objects buttonForm Union(fin)i On the Geometry toolbar, click Build AllClick the Zoom Extents button on the Graphics toolbar7 MODELING OF A 3D INDUCTORSolved with COMSOL Multiphysics 5.03 Click the Wireframe Rendering button on the Graphics toolbarThe geometry should now look as in the figure below0.1-0.10.20.0.0.1y0.0.2Next, define selections to be used when setting up materials and physics Start bdefining the domain group for the inductor winding and continue by adding otheruseful selectionsDEFINITIONSExplicitI On the Definitions toolbar, click Explicit2 In the Settings window for Explicit, in the Label text field, type Winding3 Select Domains 7,8 and 14 onlyI On the Definitions toolbar, click Explicit2 In the Settings window for Explicit, in the Label text field, type Gap3 Select domain 9 onlI On the Definitions toolbar, click Explicit8 MODELING OF A3DINDUCTORSolved with COMSOL Multiphysics 5.02 In the Settings window for Explicit, in the Label text field, type core3 Select Domain 6 onlyExplicit 4I On the Definitions toolbar, click Explicit2 In the Settings window for Explicit, in the Label text field, type InfiniteElements3 Select Domains 1-4 and 10-13 onlyExplicit 5I On the Definitions toolbar, click Explicit2 In the Settings window for Explicit, in the Label text field, type Non-conducting3 Select Domains 1-6 and 9-13 onlyI On the Definitions toolbar, click Explicit2 In the Settings window for Explicit, in the Label text field, type Non-conductingwithout Ie3 Select Domains 5, 6, and 9 only.Infinite Element Domain /(iel)Use infinite elements to emulate an infinite open space surrounding the inductorI On the definitions toolbar click Infinite element domain2 In the Settings window for Infinite Element Domain, locate the Domain Selectionsection3 From the Selection list. choose Infinite Elements4 Locate the Geometry section From the Type list, choose SphericalNext define the material settingsADD MATERIALI On the Model toolbar, click Add Material to open the add Material window2 Go to the Add material window3 In the tree, select AC/DC>Copper.4 Click Add to Component in the window toolbar9 MODELING OF A 3D INDUCTORSolved with COMSOL Multiphysics 5.0MATERIALSCopper(mat/)I In the Model Builder window, under Component I(comp l)>Materials click Copper(matD)2 In the Settings window for Material, locate the Geometric Entity Selection section3 From the Selection list, choose windingADD MATERIALI Go to the Add Material window2 In the tree. select built-In>Air3 Click Add to Component in the window toolbarMATERIALSAir(mat2I In the Model Builder window, under Component I(comp l)>Materials click Air(mat2)2 In the Settings window for Material, locate the Geometric Entity Selection section3 From the Selection list, choose Non-conductingThe core material is not part of the material library so it is entered as a user-definedmateriaMaterial 3(mat3)I In the Model Builder window, right-click Materials and choose Blank Material2 In the Settings window for Material, in the Label text field, type Core3 Locate the geometric Entity Selection section4 From the selection list choose Core5 Locate the Material Contents section. In the table, enter the following settingsPropertName Value Unit Property groupElectrical conductivity sigma0S/IBasicRelative permittivity epsilonrBasicRelative permeability mur1e3Basic6 On the model toolbar. click Add Material to close the Add Material windowMAGNETIC FIELDS (MF)Select Domains 1-8 and 10-14 only0MODELING OF A 3D INDUCTOR

人脸追踪，识别

【实例简介】学了几天的vc,不好意思，做了一个东西，功能还不够完善，用鼠标画线，实时的把曲线信息采集到数据库中，然后重画曲线。步鄹：1。鼠标画线 2。点击统计数据得到曲线总的点数。3 重新打开一个视图 4 点击重画曲线，即可。有时候会出问题，呵呵。

Android测试网速源码，还带有酷炫的仪表盘动画效果。测速的基本原理是通过上传、下载文件。算出一定时间内上传下载的字节数就是网速了。