代码搜索结果

subplot(1,1,1) n = 0:10; x = (0.9*exp(j*pi/3)).^n; k = -200:200; w = (pi/100)*k; X = x * (exp(-j*pi/100)) .^ (n'*k); magX = abs(X); angX =angle(X); subplot(2,1,1); plot(w/pi,magX);grid axis([-2,

w = [0:1:500]*pi/500; % [0, pi] axis divided into 501 points. X = exp(j*w) ./ (exp(j*w) - 0.9*ones(1,501)); magX = abs(X); angX = angle(X); subplot(2,1,1); plot(w/pi,magX); grid; axis([0,1,0,10])

n = -5:10; x = rand(1,length(n)) + j*rand(1,length(n)); k = -100:100; w = (pi/100)*k; % frequency between -pi and +pi X = x * (exp(-j*pi/100)).^(n'*k); % DTFT of x % conjugation property

% Chapter 8: Example 8.13 % Impulse Invariance Transformation % Chebyshev-2 Lowpass Filter Design % % Digital Filter Specifications: wp = 0.2*pi;

% Chapter 8: Example 8.29 % Elliptic Bandpass Filter Design: % Use of the ELLIP function % % Digital Filter Specifications: % Type: Elliptic Bandpass ws = [0.3*pi

% Chapter 8: Example 8.11 % Impulse Invariance Transformation % Butterworth Lowpass Filter Design % % Digital Filter Specifications: wp = 0.2*pi;

% Chapter 8: Example 8.12 % Impulse Invariance Transformation % Chebyshev-1 Lowpass Filter Design % % Digital Filter Specifications: wp = 0.2*pi;

% Chapter 8: Example 8.14 % Impulse Invariance Transformation % Elliptic Lowpass Filter Design % % Digital Filter Specifications: wp = 0.2*pi;

% Chapter 8: Example 8.28 % Chebyshev-1 Highpass Filter Design: % Use of the CHEBY1 function % % Digital Filter Specifications: % Type: Chebyshev-I highpass ws =

function [db,mag,pha,grd,w] = freqz_m(b,a); % Modified version of freqz subroutine % ------------------------------------ % [db,mag,pha,grd,w] = freqz_m(b,a); % db = Relative magnitude in dB comp