Ke hoʻouna mākou i kahi hōʻailona, inā he hōʻailona optical a i ʻole ka hōʻailona uila a i ʻole ka hōʻailona uila, inā e hoʻouna pololei ʻia, hiki i ka hōʻailona ke hoʻopilikia i ka leo, a paʻakikī ke loaʻa ka ʻike pololei ma ka hopena e loaʻa ai. I mea e hoʻomaikaʻi ai i ka mana anti-interference o ka ʻōnaehana, hiki ke ʻike ʻia ma ka hoʻololi ʻana i ka hōʻailona. Hiki i ka modulation ke hoʻomaikaʻi i ka nui o ka hoʻohana ʻana i ke kahawai, no laila he hopena nui ka modulation i ka pono a me ka hilinaʻi o ka ʻōnaehana kamaʻilio.
ʻO ka modulation Angle i wehewehe ʻia ma lalo nei no nā hōʻailona analog.
ʻEkolu mau ʻāpana o ka mea lawe sinusoidal: amplitude, frequency and phase. Hiki iā mākou ke hoʻouka i ka ʻike o ka hōʻailona modulated ʻaʻole wale i ka hoʻololi amplitude o ka mea lawe, akā i ka pinepine a i ʻole ka hoʻololi ʻana o ka mea lawe. I ka wā o ka hoʻololi ʻana, inā hoʻololi ke alapine o ka mea lawe me ka hōʻailona modulated, ua kapa ʻia ʻo frequency modulation a i ʻole frequency modulation (FM); Inā hoʻololi ka māhele o ka mea lawe me ka hōʻailona modulated, ua kapa ʻia ʻo ia ka modulation phase a i ʻole phase modulation (PM). Ma kēia mau kaʻina modulation ʻelua, e mau ana ka amplitude o ka mea lawe, ʻoiai ka hoʻololi ʻana i ke alapine a me ke ʻano i hōʻike ʻia e like me ka hoʻololi ʻana i ka manawa koke o ka mea lawe, no laila ua kapa ʻia ka modulation frequency a me ka modulation phase i kapa ʻia ʻo Angle modulation.
ʻO ka ʻokoʻa ma waena o ka Angle modulation a me ka amplitude modulation ʻo ia ka hoʻololi ʻana o ka spectrum hōʻailona modulated ʻaʻole ia he neʻe laina o ka spectrum hōʻailona modulated maoli, akā he hoʻololi nonlinear o ka spectrum, e hoʻopuka i nā ʻāpana alapine hou ʻokoʻa mai ka hoʻololi spectrum, no laila. kapa ʻia hoʻi ka modulation nonlinear.
Hoʻohana nui ʻia ʻo FM a me PM i nā ʻōnaehana kamaʻilio. Hoʻohana nui ʻia ʻo FM i ka hoʻolaha mele kiʻekiʻe, ka hoʻouna ʻana i nā hōʻailona leo TV, ka leka uila a me ka ʻōnaehana kelepona. Ma waho aʻe o ka hoʻohana pololei ʻana no ka hoʻouna ʻana, hoʻohana pinepine ʻia ʻo PM ma ke ʻano he hoʻololi e hoʻopuka pololei ʻole i nā hōʻailona FM. Aia kahi pilina pili ma waena o ka hoʻololi pinepine a me ka hoʻololi ʻana.
Hoʻohālikelike ʻia me ka modulation amplitude, ʻo ka mea koʻikoʻi loa o ka Angle modulation ʻo kāna hana anti-noise kiʻekiʻe. Eia nō naʻe, aia kahi kālepa ma waena o nā loaʻa a me nā poho, a ʻo ke kumukūʻai o kēia pono ʻo ka Angle modulation e noho i kahi bandwidth ākea ma mua o nā hōʻailona modulated amplitude.
ʻO ka mea i luna ʻo Shenzhen HDV Phoelectron Technology Co., Ltd. no ʻoe e lawe mai i ka ʻike "nonlinear modulation (Angle modulation)". Hoʻokumu nui ʻia ʻo Shenzhen HDV Phoelectron Technology Co., Ltd. i nā huahana kamaʻilio no ka hana ʻana o nā mea hana, ʻo ka hana o kēia manawa o nā lako e uhi ana:ONUmoʻo, moʻo module optical,OLTmoʻo, moʻo transceiver. Hiki ke hāʻawi i nā lawelawe maʻamau no nā hiʻohiʻona like ʻole o ka pono o ka pūnaewele, e hele mai e kūkākūkā.
