Thaum nws tawm los tswj lub suab purity, muaj ntau lub ntsiab lus los saib xyuas thiab xav txog. Txawm hais tias tsawg-paub tias muaj ntau, Intermodulation Distortion (hu ua IMD) yuav yog qhov tsis ncaj ncees thaum nws rears nws cov dab tuag, cacophonous lub taub hau. Tsis zoo li lwm lub suab paj nruag uas muaj feem xyuam xim, Intermodulation Distortion yog qhov cuab kev heev rau lub pob ntseg thiab tuaj yeem yog ib qho nyuaj tshaj rau kev siv lub suab nruab suab.
Qhov Kev Nruab Nrab Intermodulation Yog Dab Tsi?
Intermodulation Distortion feem ntau pom raws li kev ua kom muaj zog los yog ua ntej hloov ua ntej (tab sis yuav muaj nyob rau lwm lub suab xws li cov neeg hais lus, CD / DVD / media players, thiab lwm yam) uas quantifies cov nquag tsis sib xws ntxiv rau lub teeb liab. Zoo ib yam li Total Harmonic Distortion , Intermodulation Distortion yog ntsuas thiab sawv cev tam li ib feem pua ntawm tag nrho cov zis teeb liab. Thiab yog li nrog tag nrho Harmonic Distortion, txo cov zauv yog zoo dua rau kev ua tau zoo dua.
Intermodulation Distortion tuaj yeem tshwm sim tau thaum ob lossis ntau qhov teeb meem sib xyaw ua ke los ntawm cov cuab yeej tsis muaj linear amplifier. Txhua lub tones sib cuam tshuam nrog txhua lwm, ua cov hloov kho (lossis modulated) amplitudes. Qhov no tau tshwm sim nyob rau hauv qhov tsim ntawm frequencies - feem ntau hu ua "sidebands" - tsis tuaj yeem nyob hauv lub teeb liab thawj. Txij li cov kev sib txuas ntawm cov sib tshuam no nce siab ntawm qhov sib txawv thiab qhov txawv ntawm cov thawj cov tones, lawv pom tias tsis yog-kev sib raug zoo thiab tsis tshua muaj siab vim yog qhov tsis zoo.
Xaam thaam, has kuas cov cuabyeej ua ib qhov cim hab ua lub sijhawm pib ntawm 440 Hz. Harmonic frequencies (integer multiples ntawm qhov tseem ceeb) rau kev ntsuas ib qho tshwm sim thaum 880 Hz, 1220 Hz, 1760 Hz, thiab ntxiv rau. Yog hais tias ib tug amplifier tsim ib qho tsis-harmonic zaus ntawm 300 Hz nrog rau siv zaus ntawm 440 Hz, ib zaus peb ntawm 740 Hz yuav tsum reproduced (440 Hz + 300 Hz), thiab 740 Hz tsis yog ib harmonic ntawm 440 Hz. Yog li, nws yog lub npe Intermodulation Distortion vim nws yog ntawm harmonic frequencies.
Vim li cas Intermodulation Distortion tseem ceeb
Txij li Intermodulation Distortion yog kev tsis sib haum (tsis yog harmonic), nws yog qhov ntsuas ntau dua. Thiab thaum twg tam sim no, nws 's deb yooj yim dua tuaj ntawm pob ntseg dua harmonic distortion, vim harmonics feem ntau tam sim no nyob rau hauv cov teeb liab lawm. Tab sis nyob rau theem qis thiab / los yog nrog ntau yam suab paj nruag, Intermodulation Distortion tsis yog li yuav pom. Cov tones cais nyias yeej tseem hais tau meej. Tab sis ib zaug ntim nce mus rau ib qho chaw uas tsis muaj linearity tshwm sim hauv qhov kev hloov, qhov kev hloov thiab pliaj tiam sis tsis sib thooj los yog blurs tus thawj teeb liab.
Cov nyhuv no tseem ua rau cov suab paj nruag ntau dua (piv txwv li orchestra) uas muaj kev sib raug zoo ntawm txhua qhov kev sib txuas. Thiab cov txiaj ntsig tuaj yeem yog qhov kev tsim ntawm lub suab nrov pem suab uas zoo erode sonic kom meej thiab meej. Nyob zoo tshaj, Intermodulation Distortion ua rau dull-, veiled-, los yog lifeless-sounding music. Qhov phem, txhua yam suab nrov hnyav thiab / los yog grossly distorted.
Txawm li cas los, raws li nrog tag nrho Harmonic Distortion, Intermodulation Distortion feem ntau yog li tsawg uas nws yog imperceptible. Feem ntau cov qauv amplifiers yog tsim kom txaus txaus los ua Intermodulation Distortion heev insignificant. Cia li nco ntsoov hais tias koj pob ntseg yog tus kws txiav txim zoo dua ntawm lub suab zoo, yog li tsis txiav txim yam khoom ib txwm los ntawm cov lus qhia rau Intermodulation Distortion.