davriy signallarni spektrlari tadkik etish
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![]2++a3[u1cos(ω1t+φ1)+u2cos(ω2t+φ2)]3. (12.10) (a+b)2 , (a+b)3 ni yoyish va cosα∙cosβ=0,5cos(α+β)+0,5cos(α-β) ; cosα∙cos2β=0,5cosα+0,25cos(2α+β)+0,25cos(2α-β) ; cos2α∙cosβ=0,5cosβ+0,25cos(α+2β)+0,25cos(α-2β) ; tirgonometrik formulalardan foydalanib (12.10) ni quyidagi ko'rinishga keltiramiz i=a0+a1u1cos(ω1t+φ1)+a1u2cos(ω2t+φ2)+0,5a2u21+0,5a2u22+ +0,5a2u1cos(2ω1t+2φ1)+0,5a2u22cos(2ω2t+2φ2)+a2u1u2cos[(ω1+ ω2)t+(φ1+φ2)]+ +a2u1u2cos[(ω1-ω2)t+(φ1-φ2)]+ 0,75a3u31cos(ω1t+φ1)+0,75a3u32cos(ω2t+φ2)+ +0,25a3u31cos(3ω1t+3φ1)+0,25a3u32cos(3ω2t+3φ2)+1,5a3u21u2cos(ω2t+φ2)+ +0,75a3u21u2cos[(ω1-2ω2)t +(φ1-2φ2)]+ 0,75a3u21u2cos[(ω1+2ω2)t+(φ1+2φ2)]+ +1,5a3u1u22cos(ω1t+φ1)+0,75a3u1u22cos[(2ω1+ω2)t+(2φ1+φ2)]+ +0,75a3u1u22cos[(2ω1-ω2)t +(2φ1-φ2)] . (12.11) 12.11 ifodadagi ne orfali o'tgan tok spektral tashkil etuvchilari spektrini chizamiz (12.2-rasm). ω1 2ω1 3ω1 ω2 ω2-ω1 ω2-2ω1 ω2+ω1 ω2+2ω1 2ω2 2ω2-ω1 2ω2+ω1 3ω2 ω i0 12.2-rasm. nochiziqli element orqali umumiy holda: birinchi signal va uning garmonikalari (nω1+nφ1); ikkinchi signal va uning garmonikalari (mω2+mφ2) va kombinatsion chastotalar [(nω1+nφ1)∙(mω2+mφ2)] paydo bo'ladi. kombinatsion chastotalar murakkabligi ularning tartibi n=|n|+|m| orqali aniqlanadi (n va m butun natural sonlar). masalan ω1+2ω2 – uchinchi tartibli, 2ω1+2ω2 – to'rtinchi tartibli kombinatsion tashkil etuvchilar hisoblanadilar. 12.11 ifodadagi tok har bir spektral tashkil etuvchilari qiymati (amplitudasi) mos chastotali spektral tashkil etuvchilar yig'indisi bilan aniqlanadi. oleobject3.bin image4.wmf oleobject4.bin image5.png image1.wmf oleobject1.bin image2.wmf oleobject2.bin image3.wmf ; 4 1 , 3 1 , 2 1 2 …](/media/previews/pages/p3_226528.webp "davriy signallarni spektrlari tadkik etish - Page 3")
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1-amaliy mashg'ulot . davriy signallarni spektrlari tadkik etish davriy impulslar ketma-ketligini taxlili va tashkil etishda ishdan maksad: talabalarga joriy mavzuga oid bilimlarni berish xamda tegishli qurilmalar, unig ish tamoyili xamda signallarini shakllantirish shuningdek ularni qayta ishlash printsiplarini o'rgatidan iborat. topshirik: joriy mavzuga oid bilimlarni shu ko'rsatmaga asosan mustaxkamlash, tegishli tizim bo'lsa u auditoriyada bo'lsa to'g'rida-to'g'ri o'qituvchiga o'z xulosa va bilimlarini namoyon etish xam xisobotlar tuzishdan iborat. nazariy qism: davriy impulslar ketma-ketligini taxlilida amaliy bajarish uchun avval nazariy materiallar xamda takrorlanadi! nochiziqli elementlar va nochiziqli elektr zanjirlarda kirish signali spektrining boyish va o'zgarish hodisasi ro'y ...
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