Dab tsi yog nug hauv kev sib txuas lus digital?
Dab tsi yog nug hauv kev sib txuas lus digital?

Video: Dab tsi yog nug hauv kev sib txuas lus digital?

Video: Dab tsi yog nug hauv kev sib txuas lus digital?
Video: yog hmoov dab tsi tub huas xyooj 2024, Kaum ib hlis
Anonim

Amplitude-hloov keying ( NUG ) yog ib daim ntawv ntawm amplitude modulation uas sawv cev digital cov ntaub ntawv raws li variations nyob rau hauv lub amplitude ntawm ib tug cab kuj yoj. Ib qho digital modulation scheme siv ib tug finite tooj ntawm cov teeb liab sib txawv los sawv cev digital cov ntaub ntawv.

Ua qhov no hauv kev xav, FSK yog dab tsi hauv kev sib txuas lus digital?

Zaus-hloov keying ( FSK ) yog ib qho kev hloov kho zaus uas digital cov ntaub ntawv raug xa mus los ntawm kev sib cais zaus hloov ntawm lub teeb liab nqa khoom. Qhov yooj yim tshaj plaws FSK yog binary FSK (BFSK). BFSK siv ib khub ntawm discrete zaus xa cov ntaub ntawv binary (0s thiab 1s).

Tom qab, lo lus nug yog, dab tsi yog txhais los ntawm coherent nug? Coherent NUG Kev kuaj pom. Nyob rau hauv txoj kev ntawm demodulation txheej txheem, lub teeb liab cab kuj uas peb siv nyob rau hauv lub receiver theem yog nyob rau hauv tib theem nrog lub carrier teeb liab uas peb siv nyob rau hauv lub transmitter theem. Nws txhais tau tias tus cab kuj teeb liab ntawm transmitter thiab receiver theem yog tib yam nqi.

Ib sab ntawm no, qhov twg yog nug siv?

NUG yog siv yuav luag txhua qhov kev sib txuas lus digital nrog rau koj lub xov tooj ntawm tes thiab cable TV. Nyob rau hauv feem ntau wireless txuas xws li satellite TV thiab siab txhais TV tshaj tawm raws siv ob NUG kev sib txuas nyob rau hauv parallel, txhua ntawm 16-theem, tab sis rotated nyob rau hauv theem 90 degrees, yog li 16x16 ua ke hu ua 256 QAM.

Dab tsi yog bandwidth ntawm nug?

Ib NUG teeb liab xav tau a bandwidth sib npaug rau nws tus nqi baud. Yog li ntawd, lub bandwidth yog 2000 Hz. Hauv NUG tus nqi baud yog tib yam li cov bandwidth , uas txhais tau tias tus nqi baud yog 5000.

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