Kev faib tawm ntawm qee lub suab amplifiers

Hauv qab no koj yuav pom cov lus piav qhia ntawm tus kheej hom hais lus thiab microphones thiab lawv cov kev faib raws li lub hauv paus ntsiab lus ntawm kev ua haujlwm.

Kev sib cais ntawm cov suab nrov raws li lub hauv paus ntsiab lus ntawm kev ua haujlwm.

Magnetoelectric (Dynamic) - tus neeg xyuas pib (magnetic coil), los ntawm qhov hluav taws xob tam sim no ntws, muab tso rau hauv qhov chaw sib nqus ntawm cov hlau nplaum. Kev sib cuam tshuam ntawm cov hlau nplaum thiab tus neeg xyuas pib nrog tam sim no ua rau lub zog ntawm tus neeg xyuas pib uas cov membrane txuas nrog. Lub kauj yog nruj nreem txuas nrog lub diaphragm, thiab tag nrho cov no yog raug tshem tawm nyob rau hauv xws li ib txoj kev raws li los xyuas kom meej axial txav ntawm lub kauj nyob rau hauv lub magnet sib txawv yam tsis muaj kev sib txhuam tawm tsam cov hlau nplaum.

electromagnetic - Lub acoustic zaus tam sim no ntws tsim ib qho chaw sib nqus sib nqus. Nws magnetizes ib tug ferromagnetic core txuas nrog lub diaphragm, thiab lub attraction thiab repulsion ntawm cov tub ntxhais ua rau lub diaphragm vibrate.

Electrostatic - ib lub tshuab hluav taws xob ua los ntawm cov ntawv nyias nyias - muaj cov txheej txheem hlau tso rau ntawm ib lossis ob sab lossis ua ib qho hluav taws xob - cuam tshuam los ntawm ob lub perforated electrodes nyob rau ntawm ob sab ntawm cov ntawv ci (ntawm ib lub electrode, lub teeb liab theem yog tig 180 degrees nrog. hwm lwm tus), raws li ib tug tshwm sim ntawm cov zaj duab xis vibrates nyob rau hauv lub sij hawm nrog lub teeb liab.

magnetostrictive - magnetic teb ua rau muaj kev hloov pauv ntawm qhov ntev ntawm cov khoom ferromagnetic (magnetostrictive phenomenon). Vim lub ntuj frequencies ntawm ferromagnetic ntsiab, hom no nrov hais lus yog siv los tsim ultrasound.

Piezoelectric - hluav taws xob teb ua rau muaj kev hloov pauv ntawm qhov ntev ntawm cov khoom piezoelectric; siv hauv tweeters thiab ultrasonic li.

Ionic (membraneless) - ib hom diaphragmless hais lus nyob rau hauv uas lub diaphragm muaj nuj nqi yog ua los ntawm ib tug hluav taws xob arc uas tsim plasma.

Hom microphones

Acid - ib rab koob txuas nrog lub diaphragm txav hauv dilute acid. Hu rau (carbon) - kev txhim kho ntawm cov kua qaub microphone nyob rau hauv uas cov kua qaub yog hloov los ntawm cov pa roj carbon granules uas hloov lawv tsis kam nyob rau hauv lub siab exerted los ntawm daim nyias nyias ntawm granules. Cov kev daws teeb meem zoo li no feem ntau siv hauv xov tooj.

Piezoelectric - lub capacitor uas hloov lub teeb liab acoustic rau hauv lub teeb liab voltage.

Dynamic (magnetoelectric) - huab cua vibrations tsim los ntawm lub suab tsis txav ib lub diaphragm nyias nyias thiab ib co coil muab tso rau hauv ib tug muaj zog magnetic teb generated los ntawm ib tug hlau nplaum. Raws li qhov tshwm sim, qhov hluav taws xob tshwm sim ntawm lub coil terminals - electrodynamic quab yuam, i.e. vibrations ntawm cov hlau nplaum ntawm lub kauj, muab tso rau nruab nrab ntawm tus ncej, induces ib tug hluav taws xob tam sim no nyob rau hauv nws nrog ib tug zaus sib xws mus rau lub zaus ntawm vibrations ntawm lub suab tsis.

Niaj hnub nimno wireless microphone

Capacitive (electrostatic) - Hom microphone no muaj ob lub tshuab hluav taws xob txuas nrog lub qhov hluav taws xob tas li. Ib tug ntawm lawv yog motionless, thiab lwm yam yog ib tug membrane uas cuam tshuam los ntawm lub suab tsis, ua rau nws co.

Capacitive hluav taws xob - ib tug variant ntawm ib tug condenser microphone, nyob rau hauv uas lub diaphragm los yog tsau hauv ob sab phlu yog ua los ntawm electret, i.e. dielectric nrog tas li hluav taws xob polarization.

High zaus capacitive - muaj xws li ib tug high-frequency oscillator thiab ib tug symmetrical modulator thiab demodulator system. Qhov kev hloov pauv ntawm lub peev xwm ntawm lub tshuab hluav taws xob ntawm lub microphone modulates lub amplitude ntawm RF signals, los ntawm qhov uas, tom qab demodulation, ib tug tsawg-frequency (MW) teeb liab tau txais, sib xws rau cov kev hloov nyob rau hauv acoustic siab ntawm lub diaphragm.

Laser - nyob rau hauv no tsim, lub laser beam yog reflected los ntawm lub vibrating nto thiab hits lub photosensitive ntsiab ntawm receiver. Tus nqi ntawm lub teeb liab nyob ntawm qhov chaw ntawm lub teeb. Vim lub siab coherence ntawm lub laser beam, daim nyias nyias tuaj yeem muab tso rau ntawm qhov deb deb ntawm lub beam transmitter thiab receiver.

Optical fiber ntau - lub teeb beam dhau los ntawm thawj fiber ntau optical, tom qab kev xav ntawm qhov chaw ntawm daim nyias nyias, nkag mus rau qhov pib ntawm qhov thib ob optical fiber. Kev hloov pauv hauv lub diaphragm ua rau muaj kev hloov pauv ntawm lub teeb siv, uas tom qab ntawd hloov mus rau hauv lub teeb liab hluav taws xob.

Microphones rau wireless systems - qhov sib txawv tseem ceeb hauv kev tsim lub wireless microphone tsuas yog nyob rau hauv ib txoj kev sib txawv ntawm cov teeb liab kis tau tus mob tshaj nyob rau hauv ib tug wired system. Hloov chaw, lub tshuab xa hluav taws xob tau nruab rau hauv rooj plaub, lossis ib qho kev sib cais uas txuas nrog lub ntsuas hluav taws xob lossis nqa los ntawm tus kws ntaus suab paj nruag, thiab lub receiver nyob ib sab ntawm lub console. Feem ntau siv transmitters ua haujlwm hauv FM zaus hloov kho qhov system hauv UHF (470-950 MHz) lossis VHF (170-240 MHz) bands. Lub receiver yuav tsum tau teem rau tib lub channel raws li lub microphone.