Znn3bq.jpeg
²é¿´: 770  |  »Ø¸´: 2

zizoull

гæ (СÓÐÃûÆø)

[ÇóÖú] MATLABÀïµÄFFT¡£ÀëÉ¢¿ìËÙ¸µÀïÒ¶±ä»» ÒÑÓÐ1È˲ÎÓë

ÀëÉ¢¸µÀïÒ¶±ä»»£¬½«Àëɢʱ¼äÐòÁдÓʱ¼äÓò±ä»»µ½ÆµÂÊÓò¡£
clc;clear;
t=0:0.001:0.6;
y=sin(2*pi*50*t)+sin(2*pi*100*t);          %ƵÂÊ·Ö±ðΪ50£¬100µÄ²¨µÄµþ¼Ó¡£
Y=fft(y,512);                                         %±ä»»µ½ÆµÓò
Pyy=Y.*conj(Y)/512;                              %Çó¸µÀïÒ¶±ä»»µÄÄ£
%Pyy=abs(Y);
f=1000*(0:256)/512;                             %ƵÂÊ
plot(f,Pyy(1:257));
ÕâÑù¾ÍÄÜ´ÓͼÖп´³öËù°üº¬µÄƵÂÊ£¬·Ö±ðÊÇ50£¬100¡£Èçͼ

ÎÒÏÖÔÚÏë×öµÄÊÇ:ÔÚ³ÌÐòÖÐÓÐʲô·½·¨£¬ÄܰѲ¨ÖÐ100µÄƵÂʳɷÖÈ¥µô£¬ÔÙÓÃÀëÉ¢¸µÀïÒ¶·´±ä»» y=ifft£¨Y£¬512£©·µ»ØÊ±Óòºó£¬Ö»Ê£ÏÂy=sin(2*pi*50*t)ÕâÒ»²¿·Ö£¿

MATLABÀïµÄFFT¡£ÀëÉ¢¿ìËÙ¸µÀïÒ¶±ä»»
ww.jpg
»Ø¸´´ËÂ¥

» ²ÂÄãϲ»¶

» ±¾Ö÷ÌâÏà¹Ø¼ÛÖµÌùÍÆ¼ö£¬¶ÔÄúͬÑùÓаïÖú:

ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

wujianchana

ľ³æ (СÓÐÃûÆø)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
ÄãµÄÒâ˼ÊÇÏë×öÂ˲¨°É£¿

͵ÀÁµãµÄÀíÏëÂ˲¨¡­¡­

Äã×öÒ»¸ö100¸½½üÈ«¶¼ÊÇ0 ÆäËüÈ«ÊÇ1µÄÏòÁ¿È¥ºÍÄãµÄYÏà³Ë¡­¡­²»¾ÍֻʣÏÂ50Õâ¸öµãÉϵÄÁ¿ÁËô£¿

¶ÔÁË»¹ÓиºÆµÂʲ¿·ÖÔÚ900¸½½üµÄҲҪȫΪ0¡­¡­È»ºóifft±ä»ØÈ¥ÊÔÊÔ£¿
2Â¥2014-10-30 16:23:29
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

zizoull

гæ (СÓÐÃûÆø)

Èç¹ûÎÒ°ÑÎÒµÄYÖ±½ÓÔÚ100¸½½üµÄ¶¼¸Ä³É0£¬¸úÄã˵µÄ·½·¨Ð§¹ûÓ¦¸ÃÒ»Ñùô£¿
3Â¥2014-10-31 18:17:21
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
Ïà¹Ø°æ¿éÌø×ª ÎÒÒª¶©ÔÄÂ¥Ö÷ zizoull µÄÖ÷Ìâ¸üÐÂ
×î¾ßÈËÆøÈÈÌûÍÆ¼ö [²é¿´È«²¿] ×÷Õß »Ø/¿´ ×îºó·¢±í
[¿¼ÑÐ] Çóµ÷¼Á +11 СÄô°®Ñ§Ï° 2026-04-11 15/750 2026-04-15 21:57 by noqvsozv
[¿¼ÑÐ] 297£¬¹¤¿Æµ÷¼Á?ºÓÄÏũҵ´óѧ±¾¿Æ +11 ºÓÄÏũҵ´óѧ-ÄÜ 2026-04-14 11/550 2026-04-15 15:03 by ѧԱJpLReM
[¿¼ÑÐ] 085500Çóµ÷¼Á²ÄÁÏ +11 Ò×11122 2026-04-09 11/550 2026-04-14 17:59 by lhj2009
[¿¼ÑÐ] µ÷¼Á +12 ÔÂ@163.com 2026-04-11 12/600 2026-04-14 15:37 by zs92450
[¿¼ÑÐ] Ò»Ö¾Ô¸»¦9£¬326ÇóÉúÎïѧµ÷¼Á +10 Áõīī 2026-04-13 10/500 2026-04-14 15:16 by zs92450
[¿¼ÑÐ] 297Çóµ÷¼Á +23 ORCHID1 2026-04-10 26/1300 2026-04-14 13:52 by ³ÂƤƤ
[¿¼ÑÐ] ±¾¿ÆÎ÷¹¤´ó 324Çóµ÷¼Á +5 wysyjs25 2026-04-10 5/250 2026-04-13 23:08 by pies112
[¿¼ÑÐ] 293Çóµ÷¼Á +16 ÎÒ°®¸ßÊý¸ßÊý°®Î 2026-04-12 18/900 2026-04-13 21:47 by ѧԱJpLReM
[¿¼ÑÐ] 302Çóµ÷¼Á +10 Ò×£¡? 2026-04-13 10/500 2026-04-13 19:04 by lbsjt
[¿¼ÑÐ] ²ÄÁϸ´ÊÔÇóµ÷¼Á +24 xhhdjdjsjks 2026-04-09 24/1200 2026-04-13 15:49 by ÐÒÃâ ..
[¿¼ÑÐ] ¿¼ÑжþÂÖµ÷¼Á +10 ¹ÊÈË?? 2026-04-09 10/500 2026-04-13 09:55 by szhize
[¿¼ÑÐ] 0831Ò»ÂÖµ÷¼Áʧ°ÜÇóÖú +10 СÐÜî£î£_s 2026-04-11 10/500 2026-04-12 22:43 by ³¤¹­°Á
[¿¼ÑÐ] ±¾¿ÆÄÏ·½Ò½¿Æ´óѧ Ò»Ö¾Ô¸985 ҩѧѧ˶284·Ö Çóµ÷¼Á +5 ÈõË®ÌýÎÄ 2026-04-09 5/250 2026-04-12 13:16 by shengxi123
[¿¼ÑÐ] 277 ÊýÒ»104£¬Ñ§Ë¶£¬Çóµ÷¼Á +21 Æ¿×ÓPZ 2026-04-09 23/1150 2026-04-11 23:12 by labixiaoqiao
[¿¼ÑÐ] 270Çóµ÷¼Á +14 ÑîÀÖ369 2026-04-11 14/700 2026-04-11 20:16 by À¶ÔÆË¼Óê
[¿¼ÑÐ] Çóµ÷¼Á£¬Ò»Ö¾Ô¸´óÁ¬Àí¹¤´óѧ354·Ö +5 ÓêÉùÓàÉú 2026-04-11 6/300 2026-04-11 16:12 by ÓêÉùÓàÉú
[¿¼ÑÐ] ÖÐҩѧµ÷¼Á ³õÊÔ324 +4 Ñó¸Ê¾Õ¡¢ 2026-04-10 6/300 2026-04-11 09:41 by gong120082
[¿¼ÑÐ] 282£¬µçÆø¹¤³Ìרҵ£¬Çóµ÷¼Á£¬²»Ìôרҵ +9 jggshjkkm 2026-04-10 9/450 2026-04-10 14:55 by ÄæË®³Ë·ç
[¿¼ÑÐ] ³õÊÔ·Ö332£¬Ò»Ö¾Ô¸±¨¿¼Î÷±±¹¤Òµ´óѧ£¬ +11 ¹ÊÈË?? 2026-04-09 11/550 2026-04-09 21:54 by JineShine
[¿¼ÑÐ] ±¾¿Æ211 ¹¤¿Æ085400 280·ÖÇóµ÷¼Á ¿É¿çרҵ +3 LZH£¨µÈ´ýµ÷¼ÁÖÐ 2026-04-09 3/150 2026-04-09 21:29 by wutongshun
ÐÅÏ¢Ìáʾ
ÇëÌî´¦ÀíÒâ¼û