fftexample.m

在matlab中实现数字信号处理的一些源程序

t=linspace(0,2*pi,2^8);
x=[0.754121 0.764098 0.756575 0.744494 0.746732 0.753645 0.732422 0.675274 0.620952 0.606579 0.609325 0.567308 0.465093 0.366956 0.337533 0.347255 0.299769 0.161680 0.021697 -0.017759 0.015189 -0.015541 -0.173531 -0.348452 -0.389069 -0.311434 -0.295634 -0.449739 -0.647494 -0.678031 -0.531852 -0.434978 -0.555692 -0.761523 -0.773123 -0.539389 -0.330034 -0.388889 -0.591544 -0.585786 -0.261543 0.076082 0.095889 -0.104004 -0.101259 0.289350 0.742902 0.836493 0.622014 0.580055 0.982402 1.506736 1.645242 1.385633 1.245292 1.585266 2.112279 2.253139 1.919591 1.636625 1.845513 2.307477 2.414487 2.000000 1.563855 1.606230 1.961590 2.023559 1.555628 1.001900 0.890697 1.137533 1.173342 0.709244 0.110872 -0.099704 0.069926 0.116580 -0.277577 -0.836493 -1.075594 -0.939338 -0.847359 -1.121720 -1.574777 -1.782221 -1.644417 -1.491500 -1.627944 -1.943461 -2.086011 -1.931718 -1.725264 -1.737503 -1.918716 -1.991145 -1.824074 -1.587670 -1.509930 -1.583389 -1.599239 -1.433281 -1.195617 -1.068318 -1.069348 -1.049311 -0.899619 -0.685495 -0.544553 -0.506341 -0.469745 -0.347255 -0.173353 -0.045374 0.006234 0.045326 0.135486 0.260672 0.358476 0.405612 0.438814 0.496505 0.570624 0.628135 0.659221 0.682624 0.711193 0.735759 0.747317 0.754915 0.767765 0.773060 0.752098 0.714732 0.694035 0.698098 0.688524 0.628600 0.541629 0.490029 0.489844 0.477485 0.389081 0.255057 0.172714 0.176487 0.178809 0.078497 -0.094988 -0.204129 -0.183817 -0.142769 -0.230525 -0.429282 -0.557147 -0.504211 -0.394879 -0.438187 -0.641837 -0.778083 -0.677023 -0.469645 -0.433990 -0.620061 -0.757298 -0.601307 -0.276251 -0.134447 -0.286452 -0.428045 -0.229324 0.209867 0.465037 0.348392 0.181881 0.385064 0.902370 1.249237 1.149679 0.921642 1.068476 1.597987 1.988372 1.874317 1.545068 1.570103 2.034360 2.410009 2.253467 1.801793 1.661932 2.000000 2.316410 2.111914 1.553636 1.250175 1.440859 1.684935 1.457908 0.848482 0.430262 0.496890 0.687638 0.485389 -0.097351 -0.552602 -0.557932 -0.385064 -0.514573 -0.998380 -1.413655 -1.435592 -1.249564 -1.278094 -1.619508 -1.942839 -1.943237 -1.731042 -1.658747 -1.851045 -2.064398 -2.029381 -1.797385 -1.648039 -1.714088 -1.827513 -1.762544 -1.528917 -1.337726 -1.315433 -1.354161 -1.274001 -1.059062 -0.860723 -0.789442 -0.781751 -0.701666 -0.521148 -0.342690 -0.255057 -0.224901 -0.155903 -0.018517 0.122605 0.203182 0.238651 0.290905 0.382788 0.477201 0.535418 0.565258 0.599569 0.648030 0.691807 0.717997 0.735759 ];
figure(1);
plot(t,x);
y=[1.022618 1.031021 1.018898 0.997408 0.980856 0.958368 0.904626 0.821181 0.744539 0.697962 0.651548 0.556754 0.418298 0.300328 0.243992 0.203507 0.099536 -0.068673 -0.207432 -0.247694 -0.246769 -0.322842 -0.492627 -0.631971 -0.632588 -0.556876 -0.569792 -0.716745 -0.844069 -0.791911 -0.618383 -0.541784 -0.650981 -0.766828 -0.665735 -0.388731 -0.210815 -0.280031 -0.400010 -0.273525 0.091368 0.365034 0.325782 0.174105 0.285596 0.702593 1.050218 1.023142 0.808501 0.856784 1.276702 1.665599 1.632524 1.331399 1.273805 1.645472 2.040225 1.990203 1.597282 1.410032 1.692819 2.063485 1.997228 1.530145 1.216278 1.389217 1.716631 1.645717 1.141572 0.730133 0.794608 1.071589 1.013353 0.518747 0.056228 0.032432 0.261953 0.233399 -0.207093 -0.668641 -0.748774 -0.556496 -0.542681 -0.894934 -1.308463 -1.408984 -1.239462 -1.176154 -1.420225 -1.750659 -1.838491 -1.676314 -1.561979 -1.692448 -1.920229 -1.970836 -1.803704 -1.642845 -1.667776 -1.789956 -1.791365 -1.614127 -1.418291 -1.357676 -1.386996 -1.341378 -1.158484 -0.946629 -0.829979 -0.791808 -0.713902 -0.538913 -0.335833 -0.198287 -0.125457 -0.037927 0.110163 0.277747 0.400761 0.474572 0.547808 0.650456 0.759338 0.838031 0.885068 0.925847 0.971323 1.007273 1.022618 1.026429 1.027895 1.016283 0.977944 0.924629 0.882749 0.852050 0.797518 0.697560 0.583914 0.507104 0.464521 0.394232 0.257391 0.102144 0.010234 -0.015170 -0.065348 -0.206970 -0.380414 -0.465264 -0.442682 -0.434835 -0.548173 -0.718641 -0.779820 -0.685057 -0.587006 -0.644754 -0.799683 -0.833258 -0.656653 -0.449336 -0.435502 -0.575007 -0.594013 -0.345904 -0.028731 0.058354 -0.078733 -0.112699 0.175630 0.583104 0.731351 0.575179 0.486560 0.767906 1.229189 1.417090 1.220163 1.038461 1.260502 1.730123 1.933728 1.683820 1.385080 1.504159 1.938272 2.138242 1.839412 1.423951 1.416973 1.782987 1.968833 1.642060 1.136377 1.006183 1.288165 1.458343 1.135598 0.585546 0.358208 0.557096 0.716151 0.431155 -0.110069 -0.393738 -0.263632 -0.108336 -0.328086 -0.811732 -1.106339 -1.022348 -0.862709 -0.999984 -1.389614 -1.653888 -1.590326 -1.418780 -1.467213 -1.742187 -1.945178 -1.878724 -1.689997 -1.653344 -1.809377 -1.934319 -1.849076 -1.642798 -1.534301 -1.582440 -1.628319 -1.519442 -1.302581 -1.144242 -1.108538 -1.089051 -0.963624 -0.751083 -0.571818 -0.485410 -0.425134 -0.299651 -0.112058 0.055977 0.156386 0.228097 0.333127 0.474170 0.600787 0.681325 0.737461 0.804292 0.882155 0.944721 0.980321 1.002682];
yi=[-0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 -0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 ];
figure(2);
plot(t,y);