Puoro wāhanga rite te tikanga o te tuku raraunga

Ka rite ki mohiotia te, ngā te tohu RF o te kawe, e hāngai ana nei i runga i ngaru irirangi i roto i te puka o te kuware oscillation hawarite u (t) = cos U ( ωt + φ). Mai i tenei whai reira e i roto i te tohu kawe auau, i reira e toru tawhā motuhake, e pa ana te ōhakitia e taea te huri i te tohu mana.

fakahu'unga tenei te taea o e toru ngā momo: tīwera (AM), auau (FM), me te wā puoro (PM).

puoro Wāhanga - he tikanga o whakawhitihia tairitenga mōhiohio mamati ranei i te huri i te koki tuatahi (wāhanga) φ ₀ te auau kawe o te tohu tuku.

A, no te wā i te reira φ (t), tei runga i te mana kaha tīwera (puoro) tohu, i.e., φ (t) = ω _{0 t} + _Δ φ _∙ sinΩt + Φ ₀ = = Φ _{0 +} ke (t), i reira k - proportionality tauwehe.

Kei te te tikanga te tohu wāhanga-modulated whakaahuatia e te faaiteraa u (t) = U _n hara [ωt + φ (t)].

A, no te kotahi reo puoro [e (t) = E hara Ωt] to tatou: φ (t) = φ ₀ + Ke hara Ωt = φ ₀ + Δφ _max hara Ωt.

I muri whakakapi i te uara o te φ (t) i roto i te whārite o te tohu wāhanga-modulated whiwhi tatou u (t) = U _n te hara (ω _n t + φ ₀ + Δφ _max hara Ωt), i reira Δφ _max - huringa mōrahi i roto i te wāhanga hautanga ki te kaha tīwera o te ngaohiko mana. Δφ _max te kore i huaina koki puoro taupū me te tohu e te m.

I taea te kite, ka te m FM = Δφ _max = ke. Ko te uara inamata o te wāhanga koki wā-rerekē Θ (t) he rite ki Θ (t) = ω _n t + φ ₀ + msin Ωt, kia ω = d Θ (t) / dt = ω _n + mΩ cosΩt, ai mΩ = Δφ _max Ω = Δ Ω _n = kEΩ - ine mahora auau mōrahi mō te FM Ω _n, he tika hautanga ki te kaha tīwera, me te auautanga o te oscillation modulating.

Ko te kupu, ka te puoro taupū FM characterizing te huringa wāhanga mōrahi he hautanga ki te tohu mana tīwera, me e kore e whakawhirinaki i runga i te auau puoro. Ko te tika hautanga ki te kaha tīwera, me te auautanga o te ngaohiko modulating te rerekētanga auau e pā ana ki te tau toharite (ine).

Tei runga i te puoro wāhanga tono he maha ngā momo. Ko tētahi o ratou, i roto i ngā, ko te Shift kī Pārōnaki Wāhanga.

I roto i tenei puka, i runga i te tohu modulating rānei rerekē te wā anake o te tohu, me noho tonu te auau me te kaha tīwera. A, no te te uara mōhiohio Rpm ko kore te huringa wāhanga tino, me ona rerekētanga ki te faatura ki uara o mua.

ka karanga taiawhio Hiko, e ai te huringa i roto i te koki wāhanga o te oscillation modulated (whanaunga ki te kawe unmodulated) i roto i runga i te tohu modulating te he modulator wā.

Whakawhanakehia maha ngā momo o whakapakoko. Scheme modulator ohie Kei te varicap - ngōhiko ahei i raro i te pānga o te huri i te puritanga mana ngaohiko komititanga. I roto i tenei kaupapa, modulating te ngaohiko taui te kaha o te varicap. Tei te nekehanga wāhanga i runga i te nui whanaunga o te ngōhiko te puritanga me te R. kawenga resistance

Ko te kupu, tei te nekehanga i runga i te ngaohiko puoro. ai tenei he puoro wāhanga o te tohu reo irirangi. Heoi, e pā ana te neke taua te ki te pā he varicap te puritanga modulating ngaohiko nonlinear ki te ngaohiko modulating nonlinear e hanga raruraru atu i roto i te modulators hanga wāhanga.

e kore kua kitea wāhanga Pure puoro he tono makona whānui hoki o tona takahi nui tūturu - iti te mate haruru.