Yog hais tias koj puas tau hnov cov suab paj nruag - tshwj xeeb tshaj yog txhua hom suab lus los yog suab - tom qab ntawd koj tau raug mus ua zauv naj npawb. Qhov nram qab no-tus-scenes cov teeb liab cov zauv yog ib qho uas zoo heev thiab feem ntau yog ib qho tseem ceeb ntawm kev ua suab paj nruag niaj hnub los yog khoom siv (xws li digital-rau-analog hloov siab ). Tab sis cov cim tseem ceeb tsis yog siv rau cov suab xwb. Lub sij hawm thiab nws cov kev siv tseem siv rau lwm cov hauj lwm, xws li physics lossis digital imaging.
Txhais
Quantization yog tus txheej txheem ntawm kev siv ib lub txiaj ntsim ntawm qhov muaj nqis nkag rau me me ntawm qhov tso tawm qhov tseem ceeb uas ze ze cov ntaub ntawv tseem ceeb.
Kab: kwon • ti • zay • shuhn
Piv txwv
Hauv ib chav ua yeeb yaj kiab, cov microphones khaws cov suab paj nruag analog tsis muaj suab, uas tom qab ntawd ua tiav rau hauv hom digital. Qhov kev teeb tsa muaj peev xwm muab piv tau ntawm 44,100 Hz thiab xam nrog 8-, 16-, lossis 24-qhov tob (thiab lwm yam). Siab me ntsis depths muab ntau cov ntaub ntawv, uas ua kom muaj ntau dua kev hloov dua siab tshiab thiab kev ua luam ntawm cov thawj waveform.
Kev sib tham
Tseemceeb, ntau npaum li cas yog ib txoj haujlwm ntawm kev sib txuam uas muaj qee qhov kev txiav txim siab. Cov computers khiav lag luam ntawm cov leb thiab zeros, uas yog vim li cas analog-rau-digital conversion yog suav hais tias yog ze ze approximation thiab tsis muaj tseeb daim qauv. Thaum nws tuaj cuag cov suab paj nruag, tsis tas yuav tsum muaj cov teeb meem muaj nuj nqes kom muaj kev sib haum xeeb thiab qhov siab ntawm qhov tseem ceeb, tab sis lub sij hawm yuav tsum muaj tseeb. Tus txheej txheem tau xyuas kom paub tseeb tias cov suab paj nruag atherosclerosis yog tswj xyuas, nrog cov ntawv sau sib npaug thiab teev rau tib neeg ntaus (los yog cov feem (fractions)). Txwv tsis pub, lub suab yuav tuaj yeem ua suab nrov los yog coj txawv txawv kom mloog cov pob ntseg.
Lub tswvyim ntawm qhov ua kom tiav no tuaj yeem visually pom zoo nrog cov duab-editing, xws li Photoshop. Thaum twg cov duab loj loj me me, muaj ib qho pixel ntawm cov ntaub ntawv vim kev ua zauv kev ua haujlwm. Lub software ua cov kev laij lej thiab kev sib npaug los muab pov tseg pliaj pixels thaum khaws cov kev ntseeg siab, feem ntau, thiab cov ntsiab lus ntawm daim duab - txwv tsis pub ua cov duab raws li cov suab paj nruag. Thaum zooming nyob rau hauv thiab muab piv rau qhov rov hauv version ntawm daim duab mus rau tus thawj, cov npoo thiab cov khoom yuav tshwm sim me ntsis coarse los yog jagged. Qhov kev ua kom pom ntawm cov lus lossy compression piv rau cov hom digital audio ntaub ntawv. Cov ntaub ntawv ntxiv thiab / los yog tsawg dua compression tau zoo dua txhua yam zoo.