X l d liu a phng tin ti nn video audio da trn php bin i v ng dng trong truyn thng Phn 1: Phn tch s chung Phn 2: phn tch ng dng nn video da trn php bin i Phn 3 : phn tch ng dng audio da trn php bin i Nhng nm 1950 thc hin nn bng cng ngh tng t vi t s nn thp Ngy nay nn bng vic chuyn di tn hiu video t tng t sang s Tn hiu video c di ph 0- 6MHz Tn hiu video sau khi s ha (8 bit) c tc bit = 216Mbit/s nn khng th truyn trn 1 knh truyn hnh thng thng nu khng c nn, sau khi nn vn cn m bo c cht lng hnh nh Chun MPEG-2 : tc m ha 4-30Mbit/s Truyn hnh trn mng pht trin chun nn video H.264/MPEG -4 Part 10 vi tc m ha 1,5Mbit/s Nn video s thc cht l loi b cc thng tin d tha thng bao gm: + d tha khng gian gia cc pixel + d tha thi gian do cc nh lin tip nhau + d tha do cc thnh phn mu biu din tng pixel c tng quan cao + d tha thng k do cc k hiu xut hin trong dng bit vi cc xc sut xut hin khng u nhau + d tha tm l th gic Mc ch ca nn video l : - Gim tc dng bit ca tn hiu gc xung 1 gi tr nht nh c th ti to nh khi nn

- Gim dung lng d liu trong lu tr cng nh gim bng thng cn thit - Tit kim chi ph trong lu tr v truyn dn d liu trong khi vn duy tr cht lng nh mc chp nhn c Do c nhiu cc chun nn ra i : JPEG, M-JPEG, MPEG, DV Trong chun nn MPEG c s dng nhiu trong nn video trong truyn thng