Video: Txoj kev qhov rais yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cov qhov rais txoj kev suav nrog tsuas yog `` qhov rai '' lub theoretically zoo tagnrho lim impulse teb los ntawm ib co xaiv suitably qhov rai muaj nuj nqi, yielding. (5.8) Piv txwv li, raws li muab los ntawm Eq.(4.3), lub impulse teb ntawm lub zoo tagnrho lowpass lim yog cov paub zoo sinc muaj nuj nqi.
Ib yam li ntawd, koj tuaj yeem nug, dab tsi yog qhov rais txoj hauv kev hauv DSP?
Qhov rai Qee zaum siv rau hauv kev tsim cov ntxaij lim dej digital, tshwj xeeb tshaj yog los hloov qhov "zoo tagnrho" impulse teb ntawm lub sijhawm tsis kawg, xws li sinc muaj nuj nqi , mus rau finite impulse teb (FIR) lim tsim. Qhov ntawd yog hu ua qhov rais txoj kev.
Ib sab saum toj, vim li cas peb thiaj siv Hanning qhov rais? Hanning windows yog feem ntau siv nrog cov ntaub ntawv random vim tias lawv muaj kev cuam tshuam me ntsis ntawm qhov kev daws teeb meem zaus thiab qhov tseeb ntawm qhov ua tau zoo ntawm qhov tshwm sim, tshwj xeeb tshaj yog thaum piv rau cov teebmeem ntawm lwm yam. qhov rais.
Tsuas yog li ntawd, kuv yuav xaiv lub qhov rais ua haujlwm li cas?
Rau xaiv a qhov rais muaj nuj nqi , koj yuav tsum kwv yees cov ntsiab lus zaus ntawm lub teeb liab. Yog tias lub teeb liab muaj qhov cuam tshuam ntau zaus nyob deb ntawm qhov kev txaus siab, xaiv ib smoothing qhov rai nrog lub siab sab lobe yob-tawm tus nqi.
Vim li cas windows thiaj li tsim nyog hauv FIR lim?
Txij li thaum lub sinc muaj nuj nqi txuas mus rau infinity nyob rau hauv ob sab, nws ua rau ib tug infinite tooj ntawm kais dej ntawm lub FIR lim . Ces xws li lim tsis siv tau thiab tus naj npawb ntawm cov kais dej yuav tsum raug txiav. Qhov no yog ua tiav los ntawm kev siv qhov rais . Tab sis qhov no qhov rai muaj me me nres band attenuation rau tib tus naj npawb ntawm cov kais dej.
Pom zoo:
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