上代码: subplot(1,1,1); b = 1; a = [1, -0.8]; n = [0:100]; x = cos(0.05*pi*n); y = filter(b,a,x); figure('NumberTitle', 'off', 'Name', 'Input and Output sequence'); set(gcf,'Color','white'); subplot(2,1,1); stem(n,x); title('Input sequence'); xlabel('n'…

代码: b = [1/3, 1/3, 1/3]; a = [1, -0.95, 0.9025]; % x(n) y(n) coefficient [R, p, C] = residuez(b,a) Mp = (abs(p))', Ap = (angle(p))'/pi % polar form Y = [-2, -3]; X =[1, 1]; xic = filtic(b,a,Y,X); %% ---------------------------------------------- %% S…

代码: % Discrete-time Signal x1(n) % Ts = 0.0002; n = -25:1:25; nTs = n*Ts; Fs = 1/Ts; x = exp(-1000*abs(nTs)); Ts = 0.001; n = -5:1:5; nTs = n*Ts; Fs = 1/Ts; x = exp(-1000*abs(nTs)); % Analog Signal Dt = 0.00005; t = -0.005:Dt:0.005; xa = x * sinc(Fs*…

代码: % Analog Signal Dt = 0.00005; t = -0.005:Dt:0.005; xa = exp(-1000*abs(t)); % Discrete-time Signal Ts = 0.0002; n = -25:1:25; x = exp(-1000*abs(n*Ts)); % Discrete-time Fourier Transform %Wmax = 2*pi*2000; K = 500; k = 0:1:K; w = pi*k/K; % index ar…

代码: % Analog Signal Dt = 0.00005; t = -0.005:Dt:0.005; xa = exp(-1000*abs(t)); % Continuous-time Fourier Transform Wmax = 2*pi*2000; K = 500; k = 0:1:K; % index array k for frequencies W = k*Wmax/K; % freqency between 0 and +pi, [0,pi] axis divided i…

用到的性质 上代码: n = -5:10; x = rand(1,length(n)); k = -100:100; w = (pi/100)*k; % freqency between -pi and +pi , [0,pi] axis divided into 101 points. X = x * (exp(-j*pi/100)) .^ (n'*k); % DTFT of x % folding property y = fliplr(x); m = -fliplr(n); % signa…

用到的性质 上代码: n = 0:100; x = cos(pi*n/2); k = -100:100; w = (pi/100)*k; % freqency between -pi and +pi , [0,pi] axis divided into 101 points. X = x * (exp(-j*pi/100)) .^ (n'*k); % DTFT of x % signal multiplied y = exp(j*pi*n/4) .* x; % signal multiplied…

代码: x = rand(1,11); n = 0:10; k = 0:500; w = (pi/500)*k; % [0,pi] axis divided into 501 points. X = x * (exp(-j*pi/500)) .^ (n'*k); % DTFT of x % signal shifted by two samples y = x; m = n + 2; Y = y * (exp(-j*pi/500)) .^ (m'*k); % DTFT of y = x(n-2)…

上代码: x1 = rand(1,11); x2 = rand(1,11); n = 0:10; alpha = 2; beta = 3; k = 0:500; w = (pi/500)*k; % [0,pi] axis divided into 501 points. X1 = x1 * (exp(-j*pi/500)) .^ (n'*k); % DTFT of x1 X2 = x2 * (exp(-j*pi/500)) .^ (n'*k); % DTFT of x2 x = alpha *…

代码: n = [-5:5]; x = (-0.9).^n; % x(n) = k = -200:200; w = (pi/100)*k; % [0,pi] axis divided into 101 points. X = x * (exp(-j*pi/100)) .^ (n'*k); magX = abs(X); angX = angle(X); realX = real(X); imagX = imag(X); set(gcf,'Color','white'); subplot(2,2,1…