Distortion vs Noise
Distortion thiab suab nrov yog ob qhov sib txawv tsis xav tau ntawm cov teeb liab. Cov txheej txheem yog tsim los txo cov nyhuv ntawm ob qhov tsis xav tau tshwm sim. Hauv kev sib txuas lus cov ntaub ntawv, yog tias tsis hais kom raug, qhov cuam tshuam ntawm attenuation thiab distortion muaj peev xwm ua kom cov ntaub ntawv hloov tsis tau tiav.
Distortion
Distortion yog lub npe hu ua kev hloov pauv ntawm thawj lub teeb liab. Qhov no yuav tshwm sim vim yog cov khoom ntawm qhov nruab nrab. Muaj ntau hom kev distortions xws li amplitude distortion, harmonic distortion thiab theem distortion. Rau electromagnetic tsis, polarization distortions kuj tshwm sim. Thaum lub distortion tshwm sim, cov duab ntawm lub waveform hloov.
Piv txwv li, amplitude distortion tshwm sim yog tias txhua qhov ntawm cov teeb liab tsis sib npaug. Qhov no tshwm sim hauv kev xa xov wireless vim qhov nruab nrab tau hloov pauv los ntawm lub sijhawm. Cov neeg txais yuav tsum muaj peev xwm txheeb xyuas cov kev cuam tshuam no.
Noise
Lub suab nrov yog lub cim tsis xav tau uas tau ntxiv (superposition) rau lub teeb liab. Lub suab nrov yog ntxiv rau cov teeb liab vim muaj ntau yam ntuj tso thaum nws taug kev los ntawm qhov nruab nrab. Lub suab nrov tuaj yeem hloov pauv cov teeb liab, 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 avalanche suab 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.
Qhov 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 (SNR). 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 Distortion thiab Suab nrov?
1. Distortion yog ib qho kev hloov ntawm thawj lub teeb liab, wheresa suab yog ib qho teeb meem sab nraud random ntxiv rau qhov qub teeb liab.
2. Kev tshem tawm cov teebmeem ntawm lub suab nrov yog qhov nyuaj dua li tshem tawm cov teebmeem ntawm distortion.
3. Lub suab nrov muaj qhov xwm txheej ntau dua piv rau kev sib txawv.
