电子分频其实是相对于功率分频而言的,功率分频指音频信号经过放大器后输入音箱,通过音响内部的分频器对功率的信号进行分频后,再输出到各个单元。而电子分频先通过电子滤波器将音频信号滤波分出高、中、低后,在经过放大器分别输出到对应的单元上,这样功放就直接驳接扬声单元了
标签: 音响维修故障
上传时间: 2015-05-21
上传用户:linchangc
matlab有限元网格划分程序 DistMesh is a simple MATLAB code for generation of unstructured triangular and tetrahedral meshes. It was developed by Per-Olof Persson (now at UC Berkeley) and Gilbert Strang in the Department of Mathematics at MIT. A detailed description of the program is provided in our SIAM Review paper, see documentation below. One reason that the code is short and simple is that the geometries are specified by Signed Distance Functions. These give the shortest distance from any point in space to the boundary of the domain. The sign is negative inside the region and positive outside. A simple example is the unit circle in 2-D, which has the distance function d=r-1, where r is the distance from the origin. For more complicated geometries the distance function can be computed by interpolation between values on a grid, a common representation for level set methods. For the actual mesh generation, DistMesh uses the Delaunay triangulation routine in MATLAB and tries to optimize the node locations by a force-based smoothing procedure. The topology is regularly updated by Delaunay. The boundary points are only allowed to move tangentially to the boundary by projections using the distance function. This iterative procedure typically results in very well-shaped meshes. Our aim with this code is simplicity, so that everyone can understand the code and modify it according to their needs. The code is not entirely robust (that is, it might not terminate and return a well-shaped mesh), and it is relatively slow. However, our current research shows that these issues can be resolved in an optimized C++ code, and we believe our simple MATLAB code is important for demonstration of the underlying principles. To use the code, simply download it from below and run it from MATLAB. For a quick demonstration, type "meshdemo2d" or "meshdemond". For more details see the documentation.
标签: matlab有限元网格划分程序
上传时间: 2015-08-12
上传用户:凛风拂衣袖
Use the fast Fourier transform function fft to analyse following signal. Plot the original signal, and the magnitude of its spectrum linearly and logarithmically. Apply Hamming window to reduce the leakage. . The hamming window can be coded in Matlab as for n=1:N hamming(n)=0.54+0.46*cos((2*n-N+1)*pi/N); end; where N is the data length in the FFT.
标签: matlab fft
上传时间: 2015-11-23
上传用户:石灰岩123
共轭梯度法为求解线性方程组而提出。后来,人们把这种方法用于求解无约束最优化问题, 使之成为一种重要的最优化方法。 共轭梯度法的基本思想是把共轭性与最速下降方法相结合, 利用已知点处的梯度构造一组共 轭方向, 并沿这组方向进行搜索, 求出目标函数的极小点。 根据共轭方向的基本性质, 这种 方法具有二次终止性。 在各种优化算法中, 共轭梯度法是非常重要的一种。 其优点是所需存 储量小,具有步收敛性,稳定性高,而且不需要任何外来参数。 共轭方向 无约束最优化方法的核心问题是选择搜索方向 . 在本次实验中 , 我们运用基于共轭方向的一种 算法 — 共轭梯度法 三.算法流程图: 四.实验结果: (1). 实验函数 f=(3*x1-cos(x2*x3)-1/2)^2+(x1^2-81*(x2+0.1)+sin(x3)+1.06)^2+(exp(-x1*x2)+20*x3+ 1/3*(10*3.14159-3))^2; 给定初始点 (0,0,0) , k=1 ,最 大迭代次数 n d 确定搜索方向 进 退 法 确 定 搜 索 区 间 分割法确定最 优步长
上传时间: 2016-05-08
上传用户:saren11
Turbo C是美国Borland公司的产品,Borland公司是一家专门从事软件开发、研制的大公司。该公司相继推出了一套 Turbo系列软件, 如Turbo BASIC, Turbo Pascal, Turbo Prolog, 这些软件很受用户欢迎
上传时间: 2016-06-02
上传用户:yangljnwnu
KVM the Linux Virtual Machine Monitor
标签: Machine Monitor Virtual Linux KVM The
上传时间: 2016-08-12
上传用户:heart_2007
CAT823,CAT824和CAT825为电子系统提供基本的复位和监控功能。每个器件都能监控系统电压,并且保持复位输出直到电压达到器件规定的跳变值为止,然后保持复位输出有效的状态直到器件内部定时器超时为止(最小定时时间为140ms)以使系统电源稳定。 CAT823和CAT824还有一个看门狗输入,它可以用来监控系统信号,如果信号在超时状态出现之前没有成功的更改状态,它还可以发布复位。 CAT823和CAT825还提供手动复位输入,如果复位管脚下拉为低电平,它可以用来初始化复位。该输入可以直接连接到按钮或者处理器信号。
上传时间: 2016-12-30
上传用户:a1105520587
程序流程语句 1、 if 语句 2、 switch 语句 3、 while 语句 4、 for 语句 5、循环的嵌套 6、其他流程控制语句
上传时间: 2017-03-10
上传用户:qlxxx
类似于谷歌日历一样js的日历插件 fullcalendar是一款jQuery日程管理控件,提供了丰富的属性设置和方法调用,官网下载地址http://fullcalendar.io/download,目前最新版本是3.3.1。 只要调用$('#calendar').fullcalendar(options)即可初始化,初始化配置中events、eventSources、select和eventClick是必须设置项。
标签: fullcalendar-js 插件
上传时间: 2017-04-04
上传用户:monidianzi
关于stockwell transform的学位论文
上传时间: 2017-06-10
上传用户:yyy344