Overmodulation yog qhov xwm txheej uas muaj yeej hauv kev sib txuas lus thaum lub sijhawm tam sim ntawm cov teeb liab modulating tshaj tus nqi tsim nyog los tsim 100% kev hloov pauv ntawm cov cab kuj… Overmodulation ua rau spurious emissions los ntawm tus cab kuj modulated, thiab distortion ntawm rov qab modulating teeb liab.
Lub hom phiaj ntawm kev hloov pauv yog dab tsi?
Qhov tshwm sim dhau-kev hloov pauv tau dav siv hauv peb-theem tshuab txhawm rau txhawm rau txuas cov zis hluav taws xob ntau los ntawm kev qhia peb qhov hluav taws xob sib haum xeeb hauv cov txheej txheem hloov kho. tib lub sij hawm qhov loj thiab kev ua tau zoo tuaj yeem txhim kho.
Yuav ua li cas teeb meem thaum AM dhau kev hloov kho?
Yog hais tias dhau-modulation tshwm sim tus cab kuj raug txiav thiab qhov kev hloov kho tsis zoo li nws cov teeb liab modulating lawm Thaum tau txais qhov kawg lub teeb liab yuav distorted heev thiab nyeem tsis tau - tab sis qhov tseem ceeb tshaj, lub teeb liab dhau-modulated yuav muaj ntau bandwidth thiab yuav nplua nuj nyob rau hauv pliaj harmonics.
Dab tsi dhau thiab nyob rau hauv kev hloov kho?
Modulation Index
Nws hais txog qib ntawm kev hloov pauv uas tus neeg nqa khoom nthwv dej dhau mus. … Nws yog hu ua Under-modulation. Xws li nthwv dej yog hu ua ib qho tsis zoo-modulated yoj. Yog tias tus nqi ntawm qhov ntsuas ntsuas ntsuas ntau dua 1, piv txwv li, 1.5 lossis li ntawd, ces nthwv dej yuav dhau los ua yoj.
hom kev hloov pauv yog dab tsi?
Muaj peb hom Modulation:
- Amplitude Modulation.
- Frequency Modulation.
- Phase Modulation.
