Ntxiv nrog rau kev ua haujlwm ntawm amplifying signals thiab tsav cov hais lus nrov kom nrov nrov, zaus-hloov amplifiers kuj tseem tuaj yeem ua rau muaj kev cuam tshuam ntawm qhov chaw nrov nrov thiab ua kom lub suab sib kis tau zoo. Txawm tias nyob rau hauv ib puag ncig tsis zoo, lawv tuaj yeem cuam tshuam qhov kev quaj qw rau qhov loj tshaj plaws thiab tiv thaiv cov khoom siv hluav taws xob los ntawm kev kub hnyiab vim kev quaj qw.
Frequency-shifting amplifiers yog dav siv nyob rau hauv high-end multimedia chav kawm, chav kawm, chav sib tham me me los yog lwm yam yooj yim lub suab txhawb zog zaus. Microphones tuaj yeem txuas ncaj qha mus rau zaus hloov pauv amplifiers, uas tuaj yeem cuam tshuam lub suab nrov uas tshwm sim los ntawm microphones rau cov neeg hais lus, thiab txhawb kev nkag mus rau cov suab paj nruag tom qab rau lub suab txhawb zog.
Raws li cov txheej txheem sib txawv ntawm lub hwj chim amplifier raj hauv lub hwj chim amplifier, nws tuaj yeem muab faib ua Class A amplifiers (tseem hu ua Class A), Class B amplifiers (tseem hu ua Class B), Class AB amplifiers (tseem hu ua Class AB) thiab Class D amplifiers (tseem hu ua Class D).
Class A amplifiers xa mus rau ib hom amplifier nyob rau hauv uas txhua lub hwj chim tso zis ntawm lub amplifier yuav tsis muaj tam sim no txiav tawm (piv txwv li tso zis tawm) thaum lub sij hawm tag nrho lub voj voog ntawm lub teeb liab (zoo thiab tsis zoo ib nrab ntawm sine yoj). Class A amplifiers ua kom muaj cua sov thaum ua haujlwm thiab muaj kev ua haujlwm tsawg, tab sis lawv qhov txiaj ntsig zoo yog tias tsis muaj qhov sib txawv ntawm qhov sib txawv. Ib leeg-kawg amplifiers tag nrho ua haujlwm nyob rau hauv Class A hom, thiab thawb-rub amplifiers tuaj yeem yog Class A, Class B, lossis Class AB.
Class B amplifiers xa mus rau ib hom amplifier nyob rau hauv uas qhov zoo thiab tsis zoo ib nrab voj voog ntawm ib tug sinusoidal teeb liab yog amplified thiab tso zis los ntawm ob "caj npab" ntawm lub laub-rub tawm theem nyob rau hauv lem, thiab lub sij hawm conduction ntawm txhua "caj npab" yog ib nrab ntawm lub voj voog ntawm lub teeb liab. Qhov kom zoo dua ntawm Class B amplifiers yog kev ua haujlwm siab, thiab qhov tsis zoo yog tias lawv yuav tsim kev sib txawv ntawm crossover.
Chav kawm AB amplifiers nyob nruab nrab ntawm Chav Kawm A thiab Chav B, thiab lub sijhawm ua haujlwm ntawm txhua "arm" ntawm lub laub-rub amplifier yog ntau dua li ib nrab ntawm lub voj voog ntawm lub teeb liab tab sis tsawg dua ib lub voj voog. Class AB amplifiers zoo daws qhov teeb meem crossover distortion ntawm Class B amplifiers, thiab lawv cov kev ua tau zoo siab dua li ntawm Class A amplifiers, yog li lawv tau siv dav.
Class D amplifiers, tseem hu ua digital amplifiers, siv cov khoom siv hluav taws xob tsis tshua muaj hluav taws xob hloov hluav taws xob los ua kom muaj suab nrov, thiab muaj qhov zoo ntawm kev ua haujlwm siab thiab me me. Ntau Class D amplifiers nrog lub zog txog li 1000W tsuas yog loj li VHS video tapes. Hom amplifier no tsis haum rau kev siv los ua lub suab nrov nrov, tab sis nws muaj ntau yam kev siv hauv cov khoom siv subwoofers.
