¡Ý Design project ¿¬¼ÓÆÄÇüº¯º¹Á¶ ½Ã½ºÅÛ ±¸Çö ¹× ºÐ¼® ¡Ý
1. ¿¬¼ÓÆÄÇüº¯Á¶ Åë½Å½Ã½ºÅÛ ±¸Çö
AM (DSB-SC) ¹× FM Åë½Å ½Ã½ºÅÛÀÇ º¯Á¶±â ¹× º¹Á¶±â¸¦ ±¸ÇöÇÑ´Ù. ¹Ý¼ÛÆÄ ÁÖÆļö´Â ÀûÀýÇÏ°Ô °áÁ¤ÇÏ¿© »ç¿ëÇÏ°í, ±× ÀÌÀ¯¸¦ Á¦½ÃÇÑ´Ù. (ÀûÀýÇÑ signal processingÀ» À§ÇÏ¿© º¯Á¶ Àü¿¡ interpolationÀ» ¼öÇàoversamplingµÈ µ¥ÀÌÅÍ·Î ½ÅÈ£ ó¸®ÇÏ´Â °ÍÀÌ ÁÁÀ½)
#1 AM º¯Á¶±â &º¹Á¶±â (DSB-SC)
- Source Code
clear;
clc;
fc¡ë100000;
fs¡ë44100;
Ts¡ë1/fs;
t¡ë[0:Ts:2];
x¡ësin(2pi.t);
x1¡ëinterp(x,10);
x2¡ëabs(fftshift(fft(x1)));
t1¡ëinterp(t,10);
f¡ëlinspace(-2/fs,2/fs,length(t1));
c¡ëcos(2pifc.t1);
y¡ëx1.c;
y2¡ëabs(fftshift(fft(y)));
z¡ëy2.c;
ht¡ëfir1(48,0.02);
out¡ëfilter(ht,1,z);
out2¡ëabs(fftshift(fft(out)));
subplot(231)
plot(t1,x1);
title(`Original signal`);
subplot(232)
plot(t1,y)
title(`DSB-SC modulation`);
subplot(2¡¦(»ý·«)
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