Ọmụma

N'ime usoro nkwurịta okwu dijitalụ, onye nnata na-enweta nchikota nke mgbaàmà na-ebufe na mkpọtụ ọwa. Nnabata kacha mma nke akara dijitalụ dabere na njiri “kachasị mma” yana enwere ike mperi mperi. Njehie ndị a tụlere n'isiakwụkwọ a bụ ọkachasị n'ihi oke band...

Fig 6-6 bụ ihe nkpuchi nke usoro mgbasa ozi baseband dijitalụ. Ihe mejupụtara ya bụ ihe nzacha nnyefe (ọwa ọkụ ọkụ ọkụ), ọwa, nzacha nnabata, na onye na-ekpebi ihe nlele. Iji hụ na a pụrụ ịdabere na ya na n'usoro ọrụ o ...

Mgbama baseband dijitalụ bụ ụdị ọkụ eletrik na-anọchi anya ozi dijitalụ, nke enwere ike ịnọchite anya ọkwa dị iche iche ma ọ bụ usu. Enwere ọtụtụ ụdị akara ngosi baseband dijitalụ (nke a na-akpọ akara ngosi baseband). Onyonyo 6-1 na-egosi ụdị mgbama mgbama baseband ole na ole, ...

Enwere ike kewaa akara nnabata na akara ike na akara ike dịka ike ha siri dị. Enwere ike ikewa akara ngosi ike ka ọ bụrụ akara oge yana akara oge dịka ma ọ bụ nke oge ma ọ bụ na ọ bụghị. Mgbama ume bụ njedebe na njupụta na ogologo oge, ike ya bụ fi ...

Mgbe ike nnyefe nke ọwa anụ ahụ dị elu karịa ọchịchọ nke otu mgbaàmà, enwere ike ịkekọrịta ọwa site na ọtụtụ akara. Dị ka ihe atụ, eriri akpati ekwentị na-enwekarị ọtụtụ puku akara ndị a na-ebunye n'otu eriri anya. Multiplexing bụ nkà na ụzụ nke na-edozi ...

1) Koodu AMI Aha zuru oke nke koodu AMI (Alternative Mark Inversion) bụ koodu ngbanwe akara ọzọ. oghere) nọgide na-agbanweghị agbanwe. Dịka ọmụmaatụ: Koodu ozi: 0 1 1 0 0 0 0 0 0 0 1 1 0 0 1 1… Koodu AMI: 0 -1 +1 0 0 0 0 0 0 0 0 -1 +1 0 0 -1 +1… kwekọrọ na koodu AMI bụ ...