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设计一个数字滤波器，在频率低于 的范围内，低通幅度特性为常数，并且不低于0.75dB。在频率 和 之间，阻带衰减至少为20dB。 (1)试求满足这些条件的最低阶Butterworth滤波器。(Design a digital filter, in the range of frequencies below the low-pass amplitude characteristic is constant, and not less than 0.75dB. Between the frequency and stop-band attenuation of at least 20dB. (1) Determine the lowest-order Butterworth filter to meet these conditions.)

this is implementation huffman algorithm,you must try code. i think you must try.

一个根据互功率谱求时延的例子,先加噪声，再延时得到两路信号(A according to each other for delay of the power spectrum example, first add noise, and then delay to get two signals)

说明：  关于正弦sin信号的matlab源代码，可说明取样点数与仿真精度的关系(Sinusoidal signal sin on matlab source code, to illustrate the accuracy of the sampling points and simulation of the relationship between the)

说明：  DC machine simulation with matlab simulink and parameters of machine are not defined

another trapezoidal profile for matlab

说明：  FIR编程实现演示范例，有利于初学者迅速学会并使用相关知识(FIR Demo programming paradigm is conducive to beginners quickly learn and use knowledge)

dijkstra.m，dijkstra算法的MATLAB程序(dijkstra.m，dijkstra Algorithm in matlab)

study of data structure implementation using c

偏微分方程中利用数值方法求解Hamilton-Jacobi方程 二维情形 (Numerical calculation of Hamilton-Jacobi equation )