Pae modulation like me ka ano o kaʻikepili EYI

E like me uaʻike, ka RF neaiae ninoieo o ka lawe, a ua nānā 'ana i Radioʻale i loko o ka palapala o ka poe noonoo ole harmonic oscillation ? U (Halau) = U cos ( ωt + φ). Mai keia ka mea, penei i loko o ka lawe alapine neaiaea, eia ekolu kuokoa kiko'î, me ka hoohuoi ana i ka paʻi a hiki hoʻololi i ka hooponopono ana neaiaea.

Kēia hoʻohuʻu ka manawa kūpono o ka ekolu ano: ikaika hawewe (AM), alapine (frequency) (FM) a me ka pae modulation (PM).

Pae modulation - he ano o ka pū i hiki Analog a mīkini ike e hoʻololi i ka loiloi mua huina (pae) φ ₀ ka lawe alapine (frequency) o ka pū i hiki neaiaea.

I ka wa i pae φ (Halau) hilinaʻi nui ma ka ikaika hawewe ke kāohi (modulation) neaiae, a laila, φ (Halau) = ω _{0 'ole} + _Δ φ _∙ sinΩt + φ ₀ = = φ _{0 +} kai (k), kahi K - proportionality ololi.

Ka pae-pē neaiae ua nui i ho'ākāka 'ia ma ka' aoʻao o? U (Halau) = U _N hewa [ωt + φ ( 'ole)].

Ka wā hoʻokahi leo modulation [E (Halau) = E hewa Ωt] mākou i: φ (Halau) = φ ₀ + Ke hana hewa Ωt = φ ₀ + Δφ _max hana hewa Ωt.

Ma hope o hookomoia na aiee o φ (Halau) ma ka helu kaulike o ka pae-pē neaiae mākou loaa? U (Halau) = U _N hewa (ω _N Halau + φ ₀ + Δφ _max i ka hewa Ωt), kahi Δφ _max - i kā mākou loli ma ka pae hapaʻauhau i ka ikaika hawewe o ke ana anakahi uila. Δφ _max ole kapa huina modulation 'inideka, a ua denoted ma ka m.

I hiki ke ike, i ka wa a ka FM ka m = Δφ _max = Ke. Ke instantaneous waiwai o ka manawa-e loli iki pae makau Θ (Halau) ua like ia Θ (T) = ω _N Halau + φ ₀ + msin Ωt, no laila, ua ω = D Θ (Halau) / dt = ω _N + mΩ cosΩt, kahi mΩ = Δφ _max ω = Δ ω _n = kEΩ - i kā mākou alapine (frequency) haiahū kūmau no FM ω _n, ua pololei hapaʻauhau i ka ikaika hawewe a me ka alapine (frequency) o ka pē mālie oscillation.

Ke'ī mai, i ka wa a ka FM modulation inideka characterizing ka i kā mākou pae loli ka hapaʻauhau i ka ikaika hawewe hooponopono neaiaea, a aole e hilinai aku ma luna o ka modulation alapine (frequency). Ke alapine (frequency) oko e pili ana i ke 'O ia hoʻi (haiahū kūmau) mea pololei hapaʻauhau i ka ikaika hawewe a me ka alapine (frequency) o ka pē mālie anakahi uila.

Ke kaumaha ma muli o ka palapala noi pae modulation loaʻa paha kekahi mauʻano likeʻole. Kekahi o ia mau mea, i ka pau, o ka palena pau pae Shift Keying.

Ma keia palapala, ke kaumaha ma muli o ka pē mālie neaiae loli aʻe wale i ka pae ana o ka hōʻailona, a me ke alapine (frequency) a me ka ikaika hawewe koe a eia i. I ka wā o ka cia rpm 'ike nei i ka kāpae pae loli, a me kona mea oko a me ka mahalo i ka mua nā loina.

Electronic kaapuni, i ke kumu o ka loli ma ka pae huina o ka pē oscillation (pili i ka unmodulated lawe) i kulike ai me ka pē mālie neaiae ua kapaʻia ka pae modulator.

Ulu nui 'ano o nā kiʻi. Noaia alodio modulator maupaʻa i ka varicap - diode hiki ia ma lalo o ke kanawai o ke hoʻololi i ka hooponopono ana anakahi uila huina capacitance. Ma keia ano, pē mālie i ke anakahi uila hoʻololi i ka 'auhau o ka varicap. Ka pae naeaeaa hilinaʻi nui ma luna o ka pili nui o ka capacitance diode a me ka haawe ia'ku R.

Pela, ke naeaeaa hilinaʻi nui ma luna o ka modulation anakahi uila. Kēia ke kumu no ka pae modulation o ka Radio neaiaea. Eia naʻe, e like me ka naeaeaa ua pili me ka nonlinear pē mālie anakahi uila varicap capacitance ua pili i ka nonlinear pē mālie anakahi uila e hana nā pilikia i loko o ka hana pae modulators.

Pure pae modulation iʻaʻole i loaʻa i ka lawa laulā palapala noi no o ka hoʻomaopop 'ana i mea keakea - haʻahaʻa halulu e hoʻonele.