ex05230b.m

matlab写的数字信号处理源代码,里面包括最基本的fft计算

% Chapter 05: Example 5.23 High speed convolution
%			part b) Plotting of saved data
%                               run after part a)
load times.txt -ascii;
conv_time=times(1,:);
hsconv_time=times(2,:);
n = 1:150; subplot(1,1,1); %set(gca,'LineWidth',10);
plot(n(25:150),conv_time(25:150),n(25:150),hsconv_time(25:150))
axis([0,180,0,0.4]);
set(gca,'XTickMode','manual','XTick',[25;50;75;100;125;150]);
set(gca,'YTickMode','manual','YTick',[0.05:0.05:0.35]); %grid
text(150,0.17,'highspeed')
text(150,0.155,'convolution')
text(150,0.34,'convolution')
xlabel('sequence length N'); ylabel('time in seconds');
title('Comparison of convolution times');