Tswb pab kom nrov nrov teeb meem tsis tu ncua

Tswb Pab kom nrov nrov teeb meem teeb meem
     1.Harmonic distortion
    Thaum lub clipping tshwm sim, txij li lub teeb liab tso tawm tsis yog sine yoj, nws muaj cov txheej txheem spectral uas tsis muaj nyob rau hauv cov teeb liab tawm tswv yim, ua rau muaj kev cuam tshuam.Thaum cov teeb liab tawm tswv yim yog sine nthwv dej ntawm f zaus, nws cov spectrum yog ib qho kab ntsug (siv dav zaus) .Thaum lub teeb liab clipped, cov teeb liab tso tawm tau muaj 2f tivthaiv (ob lub suab ua suab paj nruag), 3f tivthaiv (thib peb harmonic), thiab ib qho nf tivthaiv (nth harmonic) ntxiv rau cov kev hloov pauv uas siv tau.Qhov no distortion yog hu ua harmonic distortion thiab cov harmonic Cheebtsam ua cov khoom sib txawv.Yog lub ncov kauv yog qhov sib txig (cov rau pem hauv ntej thiab thim rov qab ntawm cov zis yog ob qho tib si clipped), qhov khoom tsis sib txawv tsuas yog tshwm sim ntawm qhov tsis sib haum xeeb ntawm lub zaus nkag mus.Yog lub ncov clipping yog asymmetrical (tsuas yog qhov zoo ncov ntawm cov zis yog clipped), qhov khoom tsis sib xws kuj tshwm sim hauv txawm muaj kev sib haum xeeb.
    Lub hauv paus xwm txheej ntawm qhov sib piv ntawm tag nrho cov harmonic tivthaiv kom muaj zog tag nrho yog sib npaug los ntawm ib puas feem pua ​​thiab yog hu ua tag nrho cov suab paj nruag tsis txaus ntseeg. yog feem ntau hloov los ntawm cov tawm ntawm cov distortion tsim tawm los ntawm tus thib ob lub suab thiab harmonic peb.
     2.Ib qho kev hloov pauv
    Thaum lub teeb liab txuas ntxiv yog clipped, qhov khoom tsis sib xws tshwm sim ntawm kev sib raug zoo ntawm txhua qhov teeb liab nkag mus thiab ntawm qhov ntau zaus ua ke nrog cov teeb liab tawm tswv yim.Yog ob lub suab, zaus f1 thiab zaus f2 yog cov tswv yim, qhov cuam tshuam sib txawv yuav tshwm sim ntawm 2f1, 3f1, 2f2, 3f2, f2-f1, f1 + f2, 2f2-f1, 2f1-f2, thiab lwm yam. Yog li ntawd cov khoom tsis sib txawv yog tsim los ntawm tag nrho cov tswv yim, qhov kev cuam tshuam no hu ua kev cuam tshuam sib txawv, txawm hais tias cov qauv uas ua rau cuam tshuam yog raws nraim tib yam li harmonic distortion.
    Txij li cov intermodulation distortion tsis pom tseeb hauv lub tswb pob ntseg, nws tsis yog feem ntau tsis ntsuas.Qhov harmonic distortion thiab intermodulation distortion yog feem ntau los ntawm lub ncov clipping, lawv kuj tshwm sim los ntawm compression amplification, tab sis qhov distortion generated yog me me.
     3.Qhov cuam tshuam ntawm distortion ntawm kev hais lus zoo
    Kev puas tsuaj sib xws ua rau txo qhov sib piv rau suab nrov, uas ua rau qhov kev hais lus tsis meej.
Tag nrho cov harmonic distortion yog qhov taw qhia tseem ceeb ntawm lub suab zoo ntawm hnov pob ntseg .Tswb sib pab manufacturers feem ntau hais tias tag nrho cov kev sib sau ua kom puas tsawg tshaj li 15%, thiab tsawg dua 3% yog lub hom phiaj zoo tshaj plaws rau cov lus hnov txawm rau cov neeg uas hnov ​​lus zoo, nws nyuaj rau qhov txawv; 3% ntawm qhov distortion yog sib npaug rau qhov sib xyaw ua kom raug mob ob lub sijhawm ua haujlwm yog 30dB me dua cov paib suab nrov qib, hnov ​​tsis hnov ​​ntau dua qhov nyuaj yog qhov nyuaj los qhia.
    Txij li cov kev ntsuas tshwj xeeb ntsuas lub suab siab yog 70 dB, ntsuas ntsuas lub suab sib txawv yog me me rau lub sijhawm no, tsis txhais tau tias lub pob ntseg sib pab muaj qhov txawv txav me me thaum lub suab input voltage loj.Because lub amplifier yog linearly amplified thaum lub teeb liab tawm tswv yim qis dua hauv nruab nrab thiab nruab nrab, tsis muaj kev cuam tshuam tshwm sim.Thaum lub teeb liab tawm tswv yim tsis loj dhau, lub teeb liab tsawg dua, qhov teeb meem tsis sib haum xeeb tsim tawm tsis loj, thiab lub peev xwm nkag siab hais lus tsis cuam tshuam.Tiam sis, thaum lub teeb liab tawm tswv yim loj, lub suab nkauj harmonic yuav loj vim tias qhov nce siab clipping, thiab lub peev xwm nkag siab hais lus yuav raug txo kom tsawg.Qhov teev ntsuas lub suab siab yog 70 dB, uas yog qhov tseem ceeb raws lub suab nrov tau hnov ​​thaum sib txuas lus hais lus feem ntau 60 rau 70 dB.Txawm li cas los xij, cov neeg siv lub pob ntseg sib pab mloog nws lub suab, tshwj xeeb yog thaum hu. Vim hais tias lub suab sib ze tau ze dua lub microphone, lub suab sib nkag suab ntawm lub pob ntseg yuav yog 80 ~ 90dB, thiab qhov tsis sib xws ntawm lub pob ntseg yuav loj dua.Oua li lub rooj sib hais muaj qhov sib txawv me me, tab sis lawv suab tsis zoo, uas yog vim li cas.Yog li ntawd, txhawm rau ntsuas lub suab zoo ntawm lub pob ntseg sib pab, koj tsis tuaj yeem tsuas saib ntawm qhov tsis sib xws thaum tso zis 70dB lub suab siab.

    Thaum kawg, txawm hais tias qhov kawg clipping tau sib tham txog hauv kev ua haujlwm ntawm lub suab nrov, cov twj pab kom hnov ​​lus kuj tuaj yeem kaw lub teeb liab.Qhov no feem ntau yog vim qhov kev txwv ntawm lub zog ntawm tus txais.

Txuas :Tswb pab kom nrov nrov teeb meem tsis tu ncua

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