Ua ntej, cia peb txheeb xyuas qhov tawg thiab kho dua
Cov teeb liab video yog tias tom qab hloov video matrix, cov duab tso tawm ntawm lub ntsiab saib yog sib tshooj nrog cov duab ntxoov ntxoo ntawm lwm daim duab. Qhov no yog vim lwm cov duab teeb liab yog serialized rau hauv lub teeb liab. Thaum cov duab tseem ceeb tau nthuav tawm ci dua, Cov duab ntxoov ntxoo teeb liab ntawm lwm cov duab stringed los ntawm lub teeb liab amplitude ntawm cov channel no loj dhau. Tus duab ntxoov ntxoo yog npog, yog li nws zoo nkaus li unbearable, tab sis qhov tseeb nws tseem muaj. Thaum cov duab tseem ceeb ntawm lub vijtsam tseem tsaus, nws raug hlua rau hauv lwm daim duab. Thaum lub amplitude ntawm cov duab teeb liab ntawm ib tug channel yog piv rau lub amplitude ntawm lub ntsiab duab teeb liab tshwm sim los ntawm lub video matrix switching tso zis, lub overlapping duab ntxoov ntxoo ntawm lub koob yees duab' s duab yuav saib ntau pom tseeb.
Cov laj thawj tseem ceeb rau qhov tsis ua haujlwm no yog raws li hauv qab no:
1. Lub 75Ω coaxial cable los yog qhov system tsis zoo hauv av.
2. Kev sib cais ntawm cov video matrix yog me heev thiab tsis ua raws li cov kev cai, yog li yuav tsum tau siv txoj kev hloov pauv sai sai.
3. Cov kab hluav taws xob xaim hluav taws xob tsis zoo, xws li siv cov kab hluav taws xob tsis zoo, lossis kev sib txuas ntawm 75Ω coaxial cables ntawm cov teeb liab raug xa tawm yog qhov tsis tsim nyog, ua rau muaj teeb meem loj induction thiab crosstalk ntawm cov cables.
Plaub, lub load impedance yog mismatched tiag.
5. Kev xaim hauv qhov system yog qhov tsis tsim nyog thiab kev sib tham yog xaiv.
6. Nyob rau hauv high-frequency wired kis hom thiab wireless kis tau tus mob hom multimedia TV saib xyuas system, lub system' s crosstalk modulation thiab intermodulation yog loj heev.
