Luam theej duab los ntawm cov chaw tsim hluav taws xob - los sis tej zaum lub suab muag khoom lub khw muag khoom ntim - thiab koj yuav muaj peev xwm nyeem tau cov lus qhia tshwj xeeb hu ua Total Harmonic Distortion (hu ua THD). Koj tuaj yeem nrhiav tau cov npe no rau cov neeg hais lus, lub mloog xov tooj, cov tub / ntxhais ntaus suab paj nruag, cov amplifiers, preamplifiers, receivers , thiab ntau dua. Yeej, yog hais tias nws yog reproducing suab thiab suab paj nruag, nws yuav tsum (yuav tsum) muaj qhov kev qhia no muaj. Tag Nrho Harmonic Distortion yog ib qho tseem ceeb thaum xaiv cov cuab yeej, tab sis tsuas yog mus rau ib qho chaw.
Dab Tsi Yog Tag Nrho Harmonic Distortion?
Cov lus qhia hauv Harmonic Distortion yog ib qho uas muab cov kev tawm tswv yim tsim tawm thiab tawm suab, nrog qhov sib txawv ntawm cov theem ua ntsuas raws feem pua. Li ntawd, koj yuav pom ib qho THD uas teev li 0.02 feem pua nrog cov kev qhia txog cov zaus thiab qhov sib npaug ntawm qhov teeb meem hauv parenthesis tom qab nws (xws li 1 kHz 1 Vrms). Muaj tseeb me ntsis ntawm kev ua lej txuam nrog xam tag nrho Harmonic Distortion, tab sis txhua tus yuav tsum to taub yog qhov feem pua yog cov kev sib raug zoo ntawm distortion lossis kev hloov ntawm cov teeb liab tawm - cov feem pua yuav zoo dua. Nco ntsoov, lub teeb liab tso tawm yog kev luam thiab tsis yog ib daim ntawv zoo meej ntawm cov tswv yim, tshwj xeeb tshaj yog thaum muaj ntau lub luag haujlwm los koom nrog lub suab kaw suab. Thaum muab piv rau ob qhov teeb meem ntawm daim duab, koj yuav pom qhov txawv me ntsis.
Suab paj nruag yog tsim los ntawm kev siv thiab kev sib raug zoo . Kev sib xyaw ua ke ntawm kev siv qhov sib txawv thiab kev sib haum sib xyaw muab cov suab paj nruas cim tshwj xeeb rau lub sijhawm thiab tso cai rau tib neeg lub pob ntseg kom paub qhov txawv ntawm lawv. Piv txwv li, lub violin ua si nruab nrab ntawm A daim ntawv ceeb toom yog ua tau ib zaus siv 440 Hz thaum nws tseem tuaj yeem tsim kev sib haumxeeb (ntau ntawm qhov kev siv sijhawm) ntawm 880 Hz, 1220 Hz, 1760 Hz, thiab lwm yam. Lub cello ua si hauv nruab nrab Ib daim ntawv ceeb toom raws li lub violin tseem suab zoo li ib lub xov tooj ntawm tes vim nws txoj kev siv thiab kev sib raug zoo.
Vim Li Cas Tag Nrho Harmonic Distortion Tseemceeb
Thaum tag nrho cov Harmonic Distortion tau nce ntau dhau ib qho taw tes, koj tuaj yeem cia siab tias qhov tseeb ntawm lub suab yuav raug nyom. Qhov no tshwm sim thaum tsis muaj teeb meem harmonic frequencies - lawv tsis tuaj yeem nyob rau hauv daim phiaj tawm tswv yim qub - raug tsim thiab ntxiv rau cov qhov tso tawm. Li ntawd ib THD ntawm 0.1 feem pua yuav txhais tau tias 0.1 feem pua ntawm cov teeb liab tso tawm yog tsis muaj tseeb thiab muaj pauv cov pliaj. Qhov kev hloov pauv no tuaj yeem ua tau rau ib qho kev paub uas lub suab seev tsis zoo thiab tsis zoo li lawv yuav tsum tau ua.
Tab sis qhov tseeb, Tag Nrho Harmonic Distortion tsis tshua xav tau rau tib neeg pob ntseg, tshwj xeeb tshaj yog cov tuam txhab tsim cov khoom nrog THD specifications uas yog me me feem ntawm ib feem pua. Yog tias koj tsis tuaj yeem hnov cov lus sib txawv ntawm ib nrab, ces koj tsis paub tias qhov THD ntsuam xyuas ntawm 0.001 feem pua (uas yuav nyuaj rau kev ntsuas, dhau lawm). Tsis tas li ntawd xwb, tab sis cov lus qhia hauv Harmonic Distortion yog tus nqi nruab nrab uas tsis siv nyiaj li cas- thiab txo qis kev sib haum xeeb yog qhov nyuaj rau cov tib neeg tau hnov txog lawv cov khib nyiab thiab cov neeg yuam cai. Thiaj li ntaus suab paj nruag kuj plays lub luag hauj lwm me me.
Txhua feem ntxiv qee theem ntawm distortion, yog li ntawd nws yog nyiaj txaus siab rau kev ntsuam xyuas cov zauv thiaj li tswj tau cov lus tawm hauv kev zoo. Txawm li cas los xij, qhov feem pua ntawm Tag Nrho Harmonic Distortion tsis yog ib qho tseem ceeb ntawm kev qhia tshwj xeeb thaum saib cov duab loj, tshwj xeeb tshaj yog vim feem ntau qhov tseem ceeb tsawg tshaj li 0.005 feem pua. Qhov sib txawv me me hauv THD los ntawm ib lub npe ntawm ib qho kev sib txuas mus rau lwm tus yuav tsis tseem ceeb dua lwm cov kev xav, xws li cov suab zoo, chav suab paj nruag , thiab xaiv cov neeg hais lus ncaj , pib nrog.