Izihluzi zePassive Band Passingenziwa ngokuqhagamshela isihluzi esiphantsi kunye nesihluzi esiphakamileyo
Isihluzi sePassive Band Pass singasetyenziselwa ukwahlukanisa okanye ukucoca iifrequencies ezithile ezikwibhendi ethile okanye uluhlu lweefrequencies. I-cut-off frequency okanye i-ƒc point kwi-RC passive filter elula inokulawulwa ngokuchanekileyo kusetyenziswa i-resistor enye kuphela kuthotho kunye ne-capacitor engeyiyo i-polarized, kwaye kuxhomekeke kwindlela edibene ngayo, sibonile ukuba ifunyenwe i-Low Pass okanye i-High Pass filter.
Enye indlela elula yokusebenzisa ezi ntlobo zeefilitha ezingasebenziyo kukusetyenziswa kwee-audio amplifier okanye iisekethe ezifana neefilitha ze-loudspeaker crossover okanye ii-pre-amplifier tone controls. Ngamanye amaxesha kuyimfuneko ukudlula uluhlu oluthile lweefrikhwensi ezingaqali kwi-0Hz, (DC) okanye ziphele kwindawo ethile ephezulu yefrikhwensi kodwa zikwinqanaba elithile okanye ibhendi yeefrikhwensi, nokuba zincinci okanye zibanzi.
Ngokudibanisa okanye "ukudibanisa" isekethe enye yeLow Pass Filter kunye nesekethe yeHigh Pass Filter, singavelisa olunye uhlobo lwe-passive RC filter oludlula uluhlu olukhethiweyo okanye "ibhendi" yeefrikhwensi ezinokuba mxinwa okanye zibanzi ngelixa zinciphisa zonke ezo zingaphandle kolu luhlu. Olu hlobo lutsha lwelungiselelo lwe-passive filter luvelisa i-frequency selective filter eyaziwa njengeBand Pass Filter okanye i-BPF ngamafutshane.
Ngokungafaniyo nesihluzo se-low pass esidlulisa kuphela imiqondiso yoluhlu oluphantsi lwe-frequency okanye isihluzo se-high pass esidlulisa imiqondiso yoluhlu oluphezulu lwe-frequency, ii-Band Pass Filters zidlulisa imiqondiso ngaphakathi "kwebhendi" ethile okanye "ukusasazeka" kwee-frequency ngaphandle kokuphazamisa isignali yokufaka okanye ukungenisa ingxolo eyongezelelweyo. Le bhendi yee-frequency inokuba yiyo nayiphi na ububanzi kwaye yaziwa ngokuba yi-filters Bandwidth.
I-bandwidth idla ngokuchazwa njengoluhlu lweefrikhwensi olukhoyo phakathi kwamanqaku amabini acacisiweyo okunqunyulwa kweefrikhwensi (ƒc), angama-3dB ngaphantsi kweyona ncochoyi iphezulu okanye incochoyi evakalayo ngelixa inciphisa okanye ibuthathaka amanye angaphandle kwala manqaku mabini.
Emva koko kwiifrikhwensi ezisasazeke kakhulu, singachaza nje igama elithi “bandwidth”, i-BW njengomahluko phakathi kwefrikhwensi esezantsi (ƒcLOWER) kunye nefrikhwensi ephezulu (ƒcHIGHER). Ngamanye amazwi, i-BW = ƒH – ƒL. Ngokucacileyo ukuze isihluzi sebhendi yokudlula sisebenze ngokuchanekileyo, ifrikhwensi yokusika yesihluzi esiphantsi sokudlula kufuneka ibe phezulu kunefrikhwensi yokusika yesihluzi esiphakamileyo sokudlula.
Isihluzi seBand Pass "esifanelekileyo" singasetyenziselwa ukwahlukanisa okanye ukucoca iifrequencies ezithile ezikwibhendi ethile yeefrequencies, umzekelo, ukucinywa kwengxolo. Iifiltha zeBand pass zaziwa ngokubanzi njengezihluzi ze-second-order, (ezineepali ezimbini) kuba zine-"two" reactive component, ii-capacitors, ngaphakathi koyilo lwesekethe yazo. I-capacitor enye kwisekethe ye-low pass kunye nenye i-capacitor kwisekethe ye-high pass.
I-Bode Plot okanye i-frequency response curve engentla ibonisa iimpawu zesihluzi se-band pass. Apha isignali iyancitshiswa kwiifrequencies eziphantsi kunye ne-output eyanda kwi-slope ye-+20dB/Decade (6dB/Octave) ide ifike kwi-"lower cut-off point" ƒL. Kule frequency i-output voltage iphinde ibe yi-1/√2 = 70.7% yexabiso lesignali yokufaka okanye -3dB (20*log(VOUT/VIN)) ye-input.
Imveliso iyaqhubeka kwi-maximum gain ide ifikelele kwi-“upper cut-off” point ƒH apho i-output yehla ngesantya se--20dB/Decade (6dB/Octave) nto leyo enciphisa naziphi na iimpawu ze-high frequency. I-point of maximum gain output ngokubanzi yi-geometric mean ye-two-3dB value phakathi kwe-lower kunye ne-upper cut-off points kwaye ibizwa ngokuba yi-“Centre Frequency” okanye i-“Resonant Peak” value ƒr. Eli xabiso le-geometric mean libalwa njenge-ƒr 2 = ƒ(UPPER) x ƒ(UPHANTSI).
Aisihluzi sebhendiIthathwa njengesihluzo sohlobo lwesibini (iipali ezimbini) kuba ineenxalenye "ezimbini" ezisabelayo kwisakhiwo sayo sesekethe, ngoko i-engile yesigaba iya kuba kabini kunezihluzo ze-engile yokuqala ezibonwe ngaphambili, oko kukuthi, i-180o. I-engile yesigaba sesignali yokuphuma IKHOKELA oko kungenayo nge-+90o ukuya embindini okanye kwi-frequency ye-resonant, i-ƒr point apho iba yi-"zero" degrees (0o) okanye "kwisigaba" ize itshintshele kwi-LAG yokufaka nge--90o njengoko i-frequency yokuphuma isanda.
Amanqaku okusika aphezulu nasezantsi kwi-band pass filter anokufunyanwa kusetyenziswa ifomula efanayo naleyo yezihluzi eziphantsi neziphezulu, Umzekelo.
Iiyunithi ziza nezihlanganisi ze-SMA okanye ze-N ezisemgangathweni, okanye izihlanganisi ze-2.92mm, 2.40mm, kunye ne-1.85mm zezixhobo ezisebenzisa i-frequency ephezulu.
Singakwazi nokwenza ngokwezifiso isihluzi seBand Pass ngokweemfuno zakho. Ungangena kwiphepha lokwenza ngokwezifiso ukuze unikeze iinkcukacha ozifunayo.
Ixesha lokuthumela: Sep-06-2022
