Signal vs Noise
Signal thiab suab nrov yog ob nqe lus siv hauv hluav taws xob engineering thiab kev sib txuas lus. Lub teeb liab yog lub sijhawm lossis qhov chaw sib txawv uas nqa qee cov ntaub ntawv, thiab lub suab nrov yog qhov tsis xav tau ntawm cov teeb liab uas txo qhov pom ntawm cov ntaub ntawv ntawd. Lub teeb liab rau lub suab nrov (S / N) piv yog qhov siv dav dav los ntsuas qhov zoo ntawm cov teeb liab. Qhov siab dua qhov S / N piv, zoo dua lub teeb liab hauv qhov zoo.
Signal
Ib lub teeb liab yog cov ntaub ntawv nqa khoom. Nws yog lub sijhawm lossis qhov chaw sib txawv ntawm qhov ntau thiab siv los xa cov ntaub ntawv. Ntau yam tuaj yeem suav tias yog cov cim qhia. Piv txwv li, pixels ntawm ib daim duab, ib kab ntawv sau, thiab xim ntawm lub ntuj yog txhua yam teeb liab. Txawm li cas los xij, cov teeb liab hluav taws xob yog qhov feem ntau kawm thiab siv hom teeb liab.
Signals tuaj yeem categorized li analog thiab digital. Analog signals tuaj yeem coj tus nqi, txawm li cas los xij hauv cov cim digital, nws raug txwv rau qee qhov txiaj ntsig. Cov ntsiab lus ntawm lub teeb liab yog ib qho tseem ceeb parameter, thiab nws yog hu ua 'entropy'. Feem ntau cov teeb liab raug tshuaj xyuas hauv qhov zaus kom yooj yim.
Noise
Suab nrov yog qhov tsis xav tau ntawm cov teeb liab. Lub suab nrov yog ntxiv rau lub teeb liab vim muaj ntau yam ntuj tso vim nws taug kev los ntawm qhov nruab nrab. Lub suab nrov tuaj yeem hloov pauv tus nqi ntawm cov cim, thiab nws cuam tshuam cov txheej txheem ntawm kev nthuav tawm cov ntaub ntawv xa los ntawm lub teeb liab.
Lub suab nrov tuaj yeem tshwm sim vim yog vim li cas ntuj lossis dag. Muaj ntau hom suab nrov xws li suab nrov thermal, suab nrov nrov, suab nrov flicker, suab nrov tawg, thiab lub suab nrov nrov hauv hluav taws xob. Cov suab nrov dawb thiab Gaussian suab nrov yog cov suab nrov uas tau teev tseg. Qee lub suab nrov tsis tuaj yeem zam tau thiab tsuas yog qhov cuam tshuam ntawm lawv ntawm cov teeb liab tuaj yeem txo qis.
Kev cuam tshuam ntawm lub suab nrov ntawm lub teeb liab yog ntsuas los ntawm kev ntsuas lub npe hu ua teeb liab rau lub suab nrov (S / N) piv. Yog tias qhov sib piv S / N me me, cov nyhuv ntawm lub suab nrov dua. Yog tias qhov piv txwv S / N tsawg dua ib qho thiab qis heev, qhia tawm cov ntaub ntawv tuav hauv lub teeb liab yog qhov nyuaj.
Dab tsi yog qhov txawv ntawm Cov Teeb Meem thiab Suab nrov?
1. Feem ntau cov teeb liab yog qhov xav tau, thiab lub suab nrov yog qhov tsis xav tau, uas yuav tsum tau muab tshem tawm.
2. Rau lub teeb liab kom ua tau zoo, teeb liab rau lub suab nrov piv yuav tsum yog tus nqi siab
3. Suab nrov kuj yog ib qho teeb liab random ntxiv rau lub teeb liab thawj.
