Pakuwulutsa kwa FM, kumveka bwino ndikofunikira. Anthu nthawi zonse amayesetsa kupanga ukadaulo watsopano kuti achepetse ma siginecha aphokoso pakufalitsa kuti apititse patsogolo ma audio komanso kumvetsera. Awiri mwa matekinoloje ndi Pre-kutsindika ndi De-kutsindika. Kodi mumawamvetsa? Kugawana uku kukuwonetsani tanthauzo ndi kagwiritsidwe ntchito ka Kutsindika Kwambiri ndi Kutsindika kwa inu.
Kugawana ndi Kusamalira!
Timasangalala
Kodi Kutsindika ndi Chiyani?
M'malo mwake, kutsindika koyambirira ndi kutsitsa kumatha kutchedwa kutsindika pamodzi. Koma ndichifukwa chiyani idagawika kukhala Pre-emphasis ndi De-emphasis? Kuti tiyankhe funsoli, tikuyenera kukhala ndi chidziwitso chambiri cha Kutsindika Kwambiri ndi Kutsitsa.
Tanthauzo la Kutsindika Kwambiri
Kugogomezeratu ndi lingaliro lomwe limagwiritsidwa ntchito potumiza zida ngati ma transmitters a FM. Zimatanthawuza kuti ndondomeko isanayambe, monga zizindikiro zamakono zomwe zimaperekedwa pa chingwe, maulendo apadera olowera maulendo adzakwezedwa kapena matalikidwe adzakulitsidwa. M'mawu osavuta, phokoso la phokoso lamtundu wina limakwezedwa.
Tanthauzo la De-kutsindika
M'malo mwake, Kutsindika ndi lingaliro lomwe limagwiritsidwa ntchito polandila zida ngati mawayilesi a FM. Zimatanthawuza kuti zizindikiro zomvera zisanayambe kusinthidwa kukhala zomveka ndikusewera, maulendo afupipafupi omwewo adzagwiritsa ntchito kusintha kosiyana ndi Kutsindika Kwambiri. Ndiko kuti, voliyumu ya mawu mumtundu winayo idzachepetsedwa.
Kusiyana kwa Kutsindika Kwambiri ndi Kuchepetsa Kutsindika
Pomaliza, kutsindika koyambirira ndi kutsindika kumakhala kofanana, koma kumagwiritsidwa ntchito pazida zosiyanasiyana ndikugwiranso ntchito mosiyana. Koma amagwira ntchito pa cholinga chomwecho - kukonza ma audio.
Kodi Kutsindika Kumatheka Bwanji?
Kugogomezeratu ndi Kutsitsa-kutsindika kumagwirira ntchito limodzi kukonza ma audio. Koma kodi amakwaniritsa bwanji cholinga chimenechi?
Phokoso mu Zizindikiro Zomvera
Ma siginecha omwe amakhala pafupipafupi kwambiri amakhala ndi mphamvu yakukana ma siginecha, koma amakhala ndi mphamvu yosokoneza phokoso chifukwa ma siginecha amafupipafupi amakhala ndi mphamvu yaying'ono poyerekeza ndi ma frequency ocheperako. Chifukwa chake pakuwulutsa pawailesi, kuchotsa chikondi chaphokoso pama frequency apamwamba ndikofunikira. Ndipo Kutsindika Kwambiri ndi Kutsindika kunathetsa vutoli mwa kukonza SNR ya zizindikiro.
Kuthetsa Phokoso
Tiyeni tiwone momwe Pre-Kutsindika ndi Kutsindika kumagwirira ntchito limodzi kukonza SNR ya ma sigino.
Dziwani Mafupipafupi - Kugogomezeratu kumakulitsa zigawo zapamwamba kwambiri kudzera mu dera losavuta Kutsindika Kwambiri. Nali funso, momwe mungadziwire kuchuluka kwa ma frequency omwe akuyenera kukulitsidwa? Mudzawona kuti pali nthawi yotalikirapo ma siginecha amakulitsidwa. Timatcha nthawi kuti nthawi yokhazikika. Imawerengeredwa kudzera mu chilinganizo T = RC, pomwe R imayimira kukana mu dera ndipo C imayimira mphamvu yamagetsi mudera. Nthawi zambiri, 25μs, 50μs, ndi 75μs izi zokhazikika katatu zimapezeka, ndipo mayiko osiyanasiyana amatengera nthawi zosiyanasiyana monga muyezo. Mwachitsanzo, ku North America ndi South Korea, 75μs amagwiritsidwa ntchito, ndipo ku Ulaya, 50μs amagwiritsidwa ntchito.
Wonjezerani Ma Frequency - Ngati ma 75μs agwiritsidwa ntchito ngati nthawi yokhazikika, dera lotsikirapo limawonjezera ma frequency apamwamba kuposa 2123 Hz pamlingo wa 6 dB/octave, ndi 6 dB amatanthauza kanayi. Pambuyo powonjezera ma frequency, SNR idzakhala yabwino chifukwa gawo lokulitsa la ma frequency lidzathetsa phokoso la ma sigino.
Bweretsani Ma frequency - Kuti mukhale ndi kuyankha kwanthawi zonse, dera la De-emphasis liyenera kuwonjezeredwa ku cholandila wailesi. Mofanana ndi dera la Pre-emphasis circuit, limakhala ndi nthawi yopuma pambuyo polandira mafunde a wailesi, ndipo ndilofanana ndi la Pre-emphasis circuit. Mwachitsanzo, 75μs imagwiritsidwa ntchito potsindika De-, ndiye idzachepetsa ma frequency apamwamba kuposa 2123Hz pamlingo wa 6dB/octave.
Kugwiritsa Ntchito Kutsindika
Pawailesi yakanema, Kutsindika Kwambiri ndi Kutsindika kumatengedwa muzinthu zambiri, monga kuwulutsa kwa FM. Chifukwa FM ili ndi mawonekedwe yafupipafupi, ndizosavuta kukhudzidwa ndi phokoso. Kugogomezeratu ndi Kutsindika kumatha kukweza SNR muzizindikiro bwino. Kuphatikiza pa kutumiza chizindikiro cha analogi, kutumizirana kwa digito kumatengeranso Kutsindika. Mofanana ndi kufalitsa kwa analogi, kutumiza kwa digito kunagwiritsa ntchito Kutsindika pakuwongolera kupotoza potumiza zizindikiro pamtengo wapamwamba wa deta.
Mafunso Ofunsidwa Kawirikawiri
1. Q: Kodi Kutsindika kwa FM ndi Chiyani?
Yankho: Ndi njira yomwe chizindikiro chimasinthidwa mwanjira ina ndikubwerera mwakale pamapeto pake.
Pogwiritsa ntchito kujambula ndi kufalitsa, pofuna kupititsa patsogolo khalidwe lachidziwitso, kutsindika ndikuti chizindikirocho chimasinthidwa mwanjira inayake isanayambe kujambula kapena kutumiza, ndi ndondomeko yotsatila pamapeto ena yomwe imabwezeretsa chizindikirocho ku chikhalidwe chake. Chitsanzo chofala kwambiri pakujambula mawu ndikuchepetsa phokoso.
2. Q: Chifukwa Chiyani Kutsindika Kwambiri Kumagwiritsidwa Ntchito pa FM Transmitter?
A: Chifukwa amagwiritsidwa ntchito kukonza SNR ndikuchepetsa chikondi chaphokoso.
Pozindikira chizindikiro chosinthidwa pafupipafupi, wolandila amatha kupanga phokoso lomwe limakwera pafupipafupi. Kugogomezeratu kumawonjezera matalikidwe a ma frequency apamwamba kwambiri, potero kuwongolera SNR ndikuchepetsa chikondi chaphokoso. The ogulitsa ma FM otumiza ochokera ku FMUSER ali ndiukadaulo waposachedwa kwambiri, ngati mukufuna, fufuzani.
3. Q: Kodi zizindikiro za FM ndi chiyani?
A: Ndizizindikiro zomwe zimasunga chidziwitsocho posintha pafupipafupi mafunde.
Zizindikiro za FM zimagwiritsidwa ntchito kwambiri pamakompyuta, kulumikizana ndi matelefoni komanso kukonza ma sign. Iwo akunyamula zambiri mu mawonekedwe a kusintha kwanthawi yomweyo kwa mafunde.
4. Q: Kodi ma siginecha a FM ndi otani?
A: 87.5 -108.0 MHz, 76.0 - 95.0 MHz, 65.8 - 74.0 MHz.
87.5 - 108.0 MHz ndizomwe zimagwiritsidwa ntchito pafupipafupi padziko lonse lapansi. Ndipo 76.0 - 95.0 MHz amagwiritsidwa ntchito ku Japan, 65.8 - 74.0 MHz amagwiritsidwa ntchito makamaka m'mayiko omwe ali kumadzulo kwa Ulaya.
Kutsiliza
Ponena za izi, tikudziwa kuti Kutsindika ndiukadaulo wothandiza pakuwulutsa pawailesi, imathandizira bwino ma wayilesi pakufalitsa. FMUSER ndi katswiri wogulitsa zida zowulutsira pawayilesi, mutha kugula ma transmitters apamwamba kwambiri a FM pamitengo yokhutiritsa. Ngati mukufuna kugula ma transmitter a FM ndi kutsindika Kwambiri, chonde omasuka kutero lumikizanani ndi FMUSER.
Komanso Werengani
