Lub Nyquist Sampling Theorem hais tias: Ib lub sijhawm sib txuas tsis tu ncua tuaj yeem ua qauv thiab rov tsim kho zoo los ntawm nws cov qauv yog tias tus qauv waveform tau coj mus kuaj ntau dua ob zaug raws li nws qhov siab tshaj plaws zaus. tivthaiv.
Nyquist sampling theorem hais li cas?
Nyquist's theorem hais tias ib lub teeb liab yuav tsum tau coj mus kuaj ntau dua ob zaug ntawm qhov ntau zaus ntawm lub teeb liab.
Nyquist Theorem yog dab tsi?
Nyquist sampling (f)=d/2, qhov twg d=qhov khoom me tshaj plaws, lossis qhov siab tshaj plaws, koj xav sau. Lub Nyquist Theorem hais tias txhawm rau tsim kom tsim tau lub teeb liab txaus nws yuav tsum tau coj mus kuaj ib ntus ntawm tus nqi uas yog 2X qhov siab tshaj plaws uas koj xav sau.
Nyquist Theorem siv rau dab tsi?
The Nyquist Theorem, tseem hu ua qhov piv txwv theorem, yog txoj hauv kev uas cov kws ua haujlwm ua raws li digitization ntawm analog signals. Rau kev hloov pauv ntawm analog-rau-digital (ADC) kom ua rau muaj kev ncaj ncees rov ua dua ntawm cov teeb liab, cov hlais, hu ua cov qauv, ntawm cov qauv analog waveform yuav tsum tau noj ntau zaus.
Tus nqi ntsuas tsawg kawg yog dab tsi?
Tus nqi qis qis feem ntau hu ua Nyquist tus nqi. Piv txwv li, qhov tsawg kawg sampling tus nqi rau ib tug xov tooj hais lus teeb liab (xav tias low-pass filtered ntawm 4 kHz) yuav tsum yog 8 KHz (los yog 8000 qauv ib ob), thaum qhov tsawg kawg nkaus sampling tus nqi rau ib lub suab CD teeb liab nrog zaus mus txog 22KHz yuav tsum yog 44KHz.
