Ha re fetisa letšoao, ebang ke lets'oao la optical, lets'oao la motlakase, kapa lets'oao le se nang mohala, haeba le fetisoa ka kotloloho, lerata le ferekanngoa habonolo, 'me ho thata ho fumana tlhahisoleseling e nepahetseng qetellong ea ho amohela. E le ho ntlafatsa bokhoni ba ho thibela ho kena-kenana le tsamaiso, bo ka phethahala ka ho fetola letšoao. Ho feto-fetoha ha molumo oa lentsoe ho ka boela ha sebelisa likanale hamolemo, kahoo ho na le phello e kholo mabapi le hore na litsamaiso tsa puisano li sebetsa hantle hakae le ka botšepehi.
Ho feto-fetoha ha likhutlo tse hlalositsoeng ka tlase ke tsa matšoao a analogue.
Sesebelisoa sa sinusoidal se na le likarolo tse tharo:amplitude, frequency, le phase. Re ka kenya tlhahisoleseling ea lets'oao le fetotsoeng eseng feela ka phetoho ea amplitude ea mojari empa hape le ka makhetlo a mangata kapa phetoho ea mohato oa mojari. Nakong ea ho feto-fetoha ha molumo, haeba maqhubu a mochine a fapana le lets'oao la ho feto-fetoha ha molumo, e bitsoa frequency modulation kapa frequency modulation (FM); haeba mohato oa mokhanni o fapana le lets'oao la modulation, o bitsoa phase modulation kapa phase modulation (PM) Mefuteng ena e 'meli ea lits'ebetso tsa modulation, amplitude ea mojari e lula e le teng,' me phetoho ea frequency le phase e bontšoa e le phetoho ea mokhahlelo oa hang-hang oa mojari. Ka hona, ho feto-fetoha ha molumo oa FM le mohato ka kakaretso ho bitsoa ho feto-fetoha ha angle.
Phapangpakeng tsa angle modulation le amplitude modulation ke hore modulated signal spectrum ha e sa le linear shift of original modulated signal spectrum, empa phetoho e sa tloaelehang ea spectrum, e tla hlahisa likarolo tse ncha tsa maqhubu a fapaneng le phetoho ea spectrum, kahoo e boetse e bitsoa. ho feto-fetoha ha molumo.
FM le PMli sebelisoa haholo mekhoeng ea puisano. FM e sebelisoa haholo khasong ea 'mino oa boleng bo holimo, phetiso ea mats'oao a molumo oa TV, puisano ea sathelaete le lits'ebetso tsa mehala ea cellular. Ntle le ho sebelisoa ka kotloloho bakeng sa phetisetso, PM e boetse e sebelisoa hangata joalo ka phetoho ea ho hlahisa matshwao a FM ka tsela e sa tobang. Ho na le kamano e haufi pakeng tsa frequency modulation le phase modulation.
Ha e bapisoa le theknoloji ea amplitude modulation, molemo o hlahelletseng oa ho feto-fetoha ha li-angle ke ts'ebetso ea eona e phahameng ea anti lerata. Leha ho le joalo, ho na le melemo le tahlehelo. Litsenyehelo tsa ho fumana monyetla ona ke hore modulation ea angle e nka bandwidth e pharaletseng ho feta lets'oao la ho feto-fetoha ha amplitude.
E ka holimo ke tlhaloso ea lintlha tsa tsebo mabapi le ho feto-fetoha ha maemo (angle modulation) e tlisitsoeng HDV photoelectric Technology Co., Ltd. Shenzhen HDV photoelectric Technology Co., Ltd. ke haholo-holo moetsi oa lihlahisoa tsa puisano. Hona joale, thepa e hlahisoang e koahelaLetoto la lihlooho tse ONU, letoto la lihlooho tsa optical module, Letoto la lihlooho tse OLT, leletoto la li-transceiver. Re ka fana ka litšebeletso tse ikhethileng bakeng sa maemo a fapaneng. O amohelehile horerisana.
