Mukutepfenyura kweFM, mhando yenzwi yakakosha. Vanhu vanogara vachiedza kugadzira tekinoroji nyowani kudzikisa masaini eruzha mukufambisira kuvandudza masaini ekuteerera uye ruzivo rwekuteerera. Maviri etekinoroji ndeye Pre-kusimbisa uye De-kusimbisa. Unozvinzwisisa here? Iyi mugove ichaunza tsananguro uye mashandisirwo ePre-kusimbisa uye De-kusimbisa kwauri.
Kugovera Kuchengeta!
gutsikana
Chii chinonzi Emphasis?
Chaizvoizvo, Pre-kusimbisa uye De-kusimbisa inogona kunzi kusimbisa pamwechete. Asi nei yakakamurwa kuva Pre-kusimbisa uye De-kusimbisa? Kuti tipindure mubvunzo uyu, tinofanira kuva nenzwisiso huru yePre-emphasis uye De-emphasis.
Tsanangudzo yePre-kusimbisa
Pre-kusimbisa ndiyo pfungwa inoshandiswa mukufambisa michina yakaita seFM transmitters. Zvinoreva kuti kusati kwaitwa mamwe maitiro, senge masaini azvino ari kufambiswa pamusoro petambo, yakatarwa siyana yekupinza frequency inokwidziridzwa kana amplitude ichawedzerwa. Nemashoko akapfava, vhoriyamu yenzwi muchikamu chakati chinosimudzwa.
Tsanangudzo yeDe-kusimbisa
Mukupesana, De-kusimbisa ndiyo pfungwa inoshandiswa mukugamuchira michina yakaita seFM radio. Zvinoreva kuti masaini masaini asati ashandurwa kuita ruzha uye kuridzwa, iyo yakafanana huwandu hwe frequency inozoshandisa shanduko yakatarisana nePre-kusimbisa. Izvi zvinoreva kuti, vhoriyamu yekurira mune yakatarwa renji ichadzikiswa.
Misiyano yePre-kusimbisa uye De-kusimbisa
Mukupedzisa, Pre-kusimbisa uye De-kusimbisa yakafanana kune imwe neimwe, asi iyo inoshandiswa mumidziyo yakasiyana uye inoshanda zvakapesana. Asi vanoshandira chinangwa chimwe chete - kuvandudza masaini masaini.
Kusimbisa Kunoshanda Sei?
Pre-kusimbisa uye De-kusimbisa vanoshanda pamwechete kuvandudza masaini masaini. Asi vanozadzisa sei chinangwa ichi?
Ruzha muAudio Signals
Iwo masiginecha ari muhurefu hwakati wandei ane yakakwirira chiratidzo chekuramba, asi ine yakaipisisa yekuvhiringidza ruzha nekuti masaini ari muhuwandu hwepamusoro ane simba diki pane iwo ari mushoma frequency. Saka mukutepfenyura redhiyo, kubvisa rudo rweruzha mumhepo yepamusoro kwakakosha. Uye Pre-kusimbisa uye De-kusimbisa yakagadzirisa dambudziko nekuvandudza iyo SNR yezviratidzo.
Noise Elimination
Ngationei kuti Pre-kusimbisa uye De-kusimbisa zvinoshanda sei pamwechete kuvandudza iyo SNR yemasaini.
Sarudza iyo Frequency - Pre-kusimbisa inosimudzira iyo yakakwirira-frequency zvikamu kuburikidza neiri nyore Pre-emphasis circuit. Heino mubvunzo, nzira yekuziva kuti ndeupi huwandu hwehuwandu hunofanirwa kukwidziridzwa? Iwe uchaona paine nguva yekufamba masaini asati awedzerwa. Isu tinodaidza nguva yenguva kuti nguva yakamira. Inoverengerwa kuburikidza neformula T = RC, apo R inomiririra kuramba mudunhu uye C inomiririra simba rekupa mudunhu. Kazhinji, 25μs, 50μs, uye 75μs aya matatu-nguva anogara aripo, uye nyika dzakasiyana dzinotora dzakasiyana-siyana dzenguva seyakajairwa. Somuenzaniso, muNorth America neSouth Korea, 75μs inoshandiswa, uye muEurope, 50μs inoshandiswa.
Wedzera Frequencies - Kana iyo 75μs ikashandiswa senge nguva isingachinji, pre-kusimbisa dunhu inosimudzira mutsara mafambiro akakwira kupfuura 2123 Hz pachiyero che6 dB/octave, uye 6 dB zvinoreva kana. Mushure mekusimudzira mafambiro, iyo SNR yaizovandudzwa nekuti iyo yakakwidziridzwa chikamu chefrequency inogadzirisa ruzha mumasaini.
Dzorera Frequencies - Kuti uve neyakajairwa frequency mhinduro, De-kusimbisa dunhu rinofanira kuwedzerwa kune redhiyo inogamuchira. Zvakangofanana nePre-emphasis yedunhu, ine nguva yenguva mushure mekugamuchira masaisai eredhiyo, uye yakafanana neiyo yePre-emphasis circuit. Semuyenzaniso, 75μs inoshandiswa muDe-kusimbisa, yobva yadzikamisa mafambiro akakwira kupfuura 2123Hz pamwero we6dB/octave.
Zvishandiso Zvekusimbisa
Mukutepfenyura redhiyo, Pre-kusimbisa uye De-kusimbisa zvinogamuchirwa mune zvakawanda zvikumbiro, sekutepfenyura kweFM. Nokuti FM ine chimiro yehuwandu hwepamusoro, zviri nyore kukanganiswa neruzha. Pre-kusimbisa uye De-kusimbisa inogona kuvandudza iyo SNR mumasaini zvinobudirira. Pamusoro pekufambiswa kwechiratidzo cheanalog, iyo dhijitari yekufambisa inotora Kusimbisa zvakare. Zvakafanana nekufambiswa kweanalogi, dhijitari dhijitari yakashandisa Simbiso yekugadzirisa kukanganisa mukutumira masaini pamitengo yakakwira data.
Mibvunzo Inonyanya Kubvunzwa
1. Mubvunzo: Chii Chinosimbiswa muFM?
A: Ndiyo maitiro apo chiratidzo chinoshandurwa neimwe nzira uye chinodzoserwa kune zvakajairika pakupedzisira.
Mukuita zvekurekodha uye kutepfenyura, kuitira kuvandudza kunaka kwechiratidzo, kusimbiswa ndekwekuti chiratidzo chinoshandurwa neimwe nzira isati yarekodhwa kana kutapurirana, uye nzira inotevera kune imwe magumo inodzosera chiratidzo kune yayo yakajairika. Muenzaniso wakajairika mukurekodha odhiyo ndeyekuderedza ruzha.
2. Q: Nei Pre-kusimbisa Kuchishandiswa paFM Transmitter?
A: Nekuti inoshandiswa kuvandudza SNR uye kuderedza rudo rweruzha.
Mukuita kwekuona frequency-modulated siginecha, inogamuchira yaigadzira ruzha runokwira mu frequency. Pre-kusimbisa inowedzera amplitude yeakakwira masaini frequency, nekudaro inovandudza iyo SNR uye kuderedza rudo rweruzha. The kutengesa zvakanyanya FM transmitters kubva kuFMUSER vakashongedzerwa neazvino pre-kusimbisa tekinoroji, kana uchiifarira, zvitarise.
3. Q: Ndezvipi zviratidzo zveFM?
A: Ndiwo masaini anokodha ruzivo nekushandura iyo pakarepo frequency yemafungu.
Iwo masaini eFM anoshandiswa zvakanyanya mukombuta, kufonera uye kugadzirisa masaini. Ivo vari kutakura ruzivo muchimiro che pakarepo frequency shanduko yemafungu.
4. Mubvunzo: Ndeupi huwandu hwezviratidzo zveFM?
A: 87.5 -108.0 MHz, 76.0 - 95.0 MHz, 65.8 - 74.0 MHz.
87.5 - 108.0 MHz ndiyo inonyanya kushandiswa frequency renji pasi rese. Uye 76.0 - 95.0 MHz inoshandiswa muJapan, 65.8 - 74.0 MHz inonyanya kushandiswa munyika dziri kumadokero kweEurope.
mhedziso
Kutaura pamusoro pazvo, tinoziva kuti Kusimbisa ndiyo hunyanzvi hwekutepfenyura muredhiyo, inovandudza masaini eredhiyo mukutepfenyura. FMUSER inyanzvi yekutepfenyura redhiyo mutengesi mutengesi, unogona kutenga emhando yepamusoro FM transmitters nemitengo inogutsa. Kana iwe uchida kutenga FM radio transmitters nePre-kusimbisa, ndapota inzwa wakasununguka ku bata FMUSER.
Uyewo Verenga
