fg_10_02.m

英文书《Digital Signal Processing with Examples in MATLAB》附带的MATLAB实例

% fg_10_02    Waveform vector and amplitude spectrum.
v1=[1:7,6:-1:0,1:4,3:-1:1,2:7,6:-1:2];
Entropy_of_x=entropy(v1)
Count_of_x=32*freq(v1)
sp_fig(1);
axes('position',[.05,.2,.4,.4]);
set(gca,'fontname','times','fontsize',16);
line([0:31],v1,'marker','o','color','k'); grid on;
axis([0 32 0 7]);
xlabel('Sample (k)'); ylabel('x_k');
set(gca,'xtick',[0:31]);
set(gca,'xticklabel','0|||||5|||||10|||||15|||||20|||||25|||||30||');
set(gca,'ytick',[0:7]);
title('Signal');

axes('position',[.55,.2,.4,.4]);
set(gca,'fontname','times','fontsize',16);
V=abs(fft(v1));
line([0:16],V(1:17),'marker','*','color','k'); grid on;
axis([0 16 0 120]);
xlabel('Index (m)'); ylabel('|X_m|');
set(gca,'xtick',[0:16]);
set(gca,'xticklabel','0||||4||||8||||12||||16||');
title('Amplitude spectrum');