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Cov teebmeem ntawm cov teebmeem Kev Teeb Tsom Xeeb

Mar 11, 2019

Siv digitally soj ntsuam thiab tswj cov teeb liab analog, nws yuav tsum yog digitized nrog ib qho analog-rau-digital converter (ADC). [3] Cov zauv feem ntau yog ua tiav hauv ob theem, kev cais tawm thiab kev ntsuas. Discretization txhais tau hais tias lub teeb liab raug faib ua cov sijhawm sib npaug sib npaug, thiab txhua lub caij nyoog uas muaj ib qho kev ntsuas ntawm qhov siab. Quantization txhais tau hais tias txhua qhov kev ntsuas kev ntsuas yog kwv yees los ntawm ib qho muaj nqis los ntawm ib qho kev teeb tsa. Sib npaug ntawm cov zauv rau cov lej yog ib qho piv txwv.


Nyquist-Shannon sampling theorem hais tias lub teeb liab yuav ua raws nraim rov qab los ntawm nws cov qauv yog tias qhov piv txwv zaus ntau tshaj ob zaug qhov feem ntau qhov khoom nyob hauv qhov teeb meem. Hauv kev xyaum, feem ntau qhov piv txwv yog feem ntau siab tshaj ob zaug hauv Nyquist zaus.


Theoretical DSP analyzes thiab derivations yog feem ntau ua rau ntawm cov teeb meem tsis sib thooj sib xyaw nrog tsis muaj amplitude inaccuracies (ua yuam kev quantitating), "tsim" los ntawm txheej txheem daws teeb meem kev kuaj. Numerical txoj kev yuav tsum muaj lub teeb liab, xws li cov ua los ntawm ADC. Txoj kev ua tiav tej zaum yuav yog qhov ntau zaus lossis ib qho kev txheeb cais. Tab sis feem ntau nws yog lwm lub teeb meem uas tau muab hloov rov qab rau cov ntawv sib piv los ntawm digital-to-analog converter (DAC).