2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
DIT algorithm faib cov ntu ua ntu zus rau Ib qhov piv txwv thiab khib.
Puas yog FFT algorithm faib cov kab ke mus rau?
1. Yog tias peb faib cov N point cov ntaub ntawv ib ntus mus rau ob N / 2 taw tes cov ntaub ntawv sib txuas f1(n) thiab f2(n) Raws li tus lej suav thiab khib tus lej ntawm x(n), ces xws li FFT algorithm yog hu ua decimation-in-time algorithm.
Dab tsi yog dit algorithm?
Kev txiav txim siab hauv lub sijhawm DIT algorithm yog siv los suav DFT ntawm N-point sequence. Lub tswv yim yog txhawm rau txhawm rau N-point ib ntus ua ob ntu, DFTs uas tuaj yeem muab tau los muab DFT ntawm thawj N-point ib ntus.
DIT FFT algorithm yog dab tsi?
Qhov kev txiav txim-hauv-lub sijhawm (DIT) radix-2 FFT recursively partitions ib DFT rau hauv ob ib nrab-ntev DFTs ntawm cov qauv txawm-indexed thiab khib-indexed sijhawm. … Lub radix-2 kev txiav txim siab-hauv-lub sijhawm thiab kev txiav txim siab-hauv-frequency ceev Fourier hloov pauv (FFTs) yog qhov yooj yim tshaj plaws FFT algorithms.
Yuav ua li cas ntau npaum li cas complex multiplications yuav tsum tau ua rau txhua FFT algorithm1 point a N 2 Logn B nlog2n C N 2 log2n D Tsis muaj qhov hais?
Kev piav qhia: Hauv txoj kev sib tshooj ntxiv, N-point cov ntaub ntawv thaiv muaj L cov ntaub ntawv tshiab cov ntsiab lus thiab ntxiv M-1 xoom thiab tus lej ntawm cov kev sib txuas uas xav tau hauv FFT algorithm yog (N / 2)log2N . Yog li, tus naj npawb ntawm complexmultiplications per output data point is [Nlog22N]/L.
Pom zoo:
Thaum muab piv cov kab kab kab thiab cov kab ntsig flatworms qhov twg muaj tseeb?
Ib tug flatworm muaj nyias, dorsoventrally flattened lub cev. Roundworms yog ntau cylindrical hauv cov duab thiab tapered mus rau qhov zoo ntawm ib kawg. Ib yam li ntawd, cov kab mob roundworms muaj ib txheej txheej txheej hu ua cuticle uas lawv tau rov ua dua thoob plaws hauv lawv lub neej thiab thaum lawv loj hlob.
Yuav ua li cas txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau pom kev pom?
Txawm li cas los xij, corneal collagen cross-linking - cov txheej txheem qib siab tau pom zoo los ntawm US Food and Drug Administration (FDA) hauv xyoo 2016 - tuaj yeem txhim kho qhov pom kev hauv cov neeg mob txhua hnub nyoog. Corneal collagen cross-linking (CXL) tsis yog kho rau keratoconus, tab sis nws tuaj yeem pab tiv thaiv tus mob kom tsis txhob mob hnyav.
Cov kab kab kab kab kab ua kab mob txaus ntshai npaum li cas?
Nyob rau hauv peb thiab tom ntej instars ntawm lawv txoj kev loj hlob, Pine processionary caterpillars yog mob heev rau daim tawv nqaij ntawm tib neegthiab lwm yam tsiaj. Kev sib cuag yooj yim nrog cov plaub hau ntawm kab ntsig tuaj yeem ua rau pob khaus hnyav (urticaria) thiab khaus qhov muag, thiab qee tus neeg yuav muaj kev fab tshuaj.
Cov tshuaj kab kab mob puas yuav ua haujlwm rau cov kab mob sib kis?
Bayer Drontal Broad Spectrum Dewormer zoo tshem tawm ntau hom kab mob hauv plab nrog rau cov kab mob tapeworms, hookworms, thiab roundworms. Kuv puas tuaj yeem kho kuv tus miv rau kab kab kab kab thiab kab kab sib chaws tib lub sijhawm?
Lub zog hloov pauv ntawm tiam mus rau kev xa mus rau kev faib tawm li cas?
Power, tshwj xeeb tshaj yog qib voltage, xa los ntawm cov kab xa tawm raug txo, lossis "tso nqis," los ntawm kev hloov pauv thiab xa mus los ntawm cov kab xa tawm, uas txuas nrog tom tsev thiab kev lag luam. … Nws yog ceg kawg ntawm kev xa hluav taws xob los ntawm ib tiam mus rau cov neeg siv khoom.
