DFT ua dab tsi?
DFT ua dab tsi?

Video: DFT ua dab tsi?

Video: DFT ua dab tsi?
Video: Ua Dab Tsi Txhaum Koj - David Yang (New Song 2021) 2024, Kaum ib hlis
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Cov DFT yog ib qho ntawm cov cuab yeej muaj zog tshaj plaws indigital signal processing uas ua rau peb nrhiav tau lub spectrum ntawm lub sijhawm kawg ntawm lub teeb liab. Cov DFT yog ib qho ntawm cov cuab yeej muaj zog tshaj plaws hauv kev ua cov teeb liab digital uas ua rau peb tofind lub spectrum ntawm qhov kawg-lub sijhawm teeb liab.

Dhau li, DFT hauv DSP yog dab tsi?

Digital Signal Processing . Raws li lub npe cuam tshuam, lub Discrete Fourier Hloov ( DFT ) yog purelydiscrete: discrete-time cov ntaub ntawv teev tau hloov dua siab tshiab rau hauv adiscrete-zaus sawv cev. Qhov no yog qhov sib piv rau DTFT uas siv lub sijhawm sib cais, tab sis hloov mus rau qhov tsis tu ncua.

Ib yam nkaus, yog vim li cas DFT siv hauv kev ua duab? Fourier Transform yog qhov tseem ceeb cov duab tool uas yog siv decompose ib duab rau hauv nws cov khoom siv sine thiab cosine. Output ntawm kev hloov pauv sawv cev rau duab nyob rau hauv lub Fourier orfrequency sau, thaum lub tswv yim duab yog qhov sib npaug spatialdomain.

Xav txog qhov no, qhov txawv ntawm FFT thiab DFT yog dab tsi?

Discrete Fourier Hloov ( DFT ) yog qhov sib txawv ntawm Fourier Transform (FT) uas hloov pauv asignal (lossis sib cais tsis sib xws) los ntawm lub sijhawm ua tus sawv cev rau nws tus sawv cev hauv zaus domain. Whereas, FastFourier Hloov ( FFT ) yog ib qho txiaj ntsig zoo algorithm rau suav nrog DFT.

Vim li cas peb siv DFT tsis yog Dtft?

Hauv DTFT koj qhov kev txiav txim siab, lub sijhawm aperiodic domainsignal tau hloov pauv mus tas li, ncua sij hawm ntau zaus domainsignal. Hauv DFT , koj lub teeb liab input yog cov zis ntawm koj DTFT uas yog txuas ntxiv mus, ncua sij hawm ntau zaus domainsignal, thiab DFT muab koj cov qauv Discrete ntawm qhov txuas ntxiv DTFT.

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