Overtone vs Undertone
Overtones thiab undertones yog phenomena tham nyob rau hauv nthwv dej thiab vibrations. Cov ntsiab lus ntawm overtone thiab undertone feem ntau yog tham hauv suab paj nruag thiab lwm yam suab muaj feem cuam tshuam. Cov overtones thiab undertones tseem ceeb heev hauv kev tsim suab paj nruag, ua suab paj nruag thiab txawm hu nkauj thiab tsim cov twj paj nruag. Nws yog ib qho tseem ceeb kom muaj kev nkag siab zoo hauv cov ntsiab lus ntawm overtones thiab undertones kom ua tau zoo hauv thaj chaw xws li suab paj nruag, suab engineering, acoustics, nthwv dej thiab vibrations. Hauv tsab xov xwm no, peb yuav tham txog dab tsi overtone thiab undertone yog, lawv qhov zoo sib xws, cov ntsiab lus ntawm overtone thiab undertone, lawv cov ntawv thov thiab thaum kawg qhov txawv ntawm overtone thiab undertone.
Yuav ua li cas yog Overtone?
Overtone yog qhov tshwm sim uas txuas ncaj qha nrog lub suab nrov thiab qhov tseem ceeb ntawm qhov system. Yuav kom nkag siab txog lub tswv yim ntawm overtone, ib tug yuav tsum xub muaj kev nkag siab txog qhov tseem ceeb zaus yog dab tsi. Qhov tseem ceeb zaus yog ib lub tswv yim sib tham hauv cov nthwv dej sawv ntsug. Xav txog ob qho tib si nthwv dej uas taug kev hauv qhov sib txawv. Thaum ob lub nthwv dej sib ntsib, qhov tshwm sim yog hu ua yoj sawv. Qhov sib npaug ntawm yoj mus rau hauv + x kev taw qhia yog y=A sin (ωt – kx), thiab qhov sib npaug rau ib tug zoo xws li yoj mus rau hauv lub -x kev taw qhia yog y=A sin (ωt + kx). Los ntawm lub hauv paus ntsiab lus ntawm superposition, lub resultant waveform los ntawm qhov sib tshooj ntawm ob yog y=2A sin (kx) cos (ωt). Qhov no yog qhov sib npaug ntawm qhov sawv nthwv dej. Raws li x yog qhov kev ncua deb ntawm lub hauv paus chiv keeb, rau ib tug muab x tus nqi lub 2A sin (kx) ua ib tug tas li, thiab Sin (kx) txawv ntawm -1 thiab +1. Yog li ntawd, qhov siab tshaj plaws amplitude ntawm lub system yog 2A. Lub hauv paus zaus yog cov cuab yeej ntawm qhov system. Ib qho overtone yog txhua zaus uas siab tshaj qhov zaus ntawm qhov system. Overtones feem ntau yog tsim los ntawm qhov tseem ceeb zaus. Kev sau ntawm overtones thiab cov zaus hauv paus yog hu ua partials. Ib feem, uas yog qhov sib npaug ntawm qhov sib npaug ntawm qhov zaus, hu ua harmonics. Lub suab seev suab paj nruag tsim yog ib feem. Qhov zoo ntawm lub suab ntawm ib qho cuab yeej tuaj yeem txawv ntawm lwm tus yog nyob ntawm qhov ua tau ib nrab.
Dab tsi yog Undertone?
Ib qho kev nkag siab yog txhua zaus uas qis dua qhov tseem ceeb ntawm qhov system. Cov zauv feem ntau ntawm cov zaus zaus tsim cov undertone series. Lub undertone series yog inverse ntawm lub overtone series. Cov undertone series tuaj yeem tsim tau los ntawm kev muab qhov ntev ntawm qhov system los ntawm cov lej suav.
Qhov txawv ntawm Overtone thiab Undertone yog dab tsi?
• Ib qho overtone yog txhua zaus uas siab tshaj qhov zaus ntawm qhov system. Ib qho undertone yog txhua zaus uas qis dua qhov tseem ceeb ntawm qhov system.
• Nws muaj peev xwm los tsim overtones thaum tsim cov hauv paus, tab sis nws tsis tuaj yeem tsim cov undertones los ntawm txoj kev zoo li no.
