X Su thu dich Tinh huu ngh
1.Truyen thong tin
Truyen thong tin co ban la sir truyen phat giua mot ngirdi vdi mot ngudi va d day ca ngudi giri va ngudi nhan deu neng re.
Tu thdi co xua, loai ngudi da va dang phat trien rat nhieu loai truy en phat. no bao gom ngua dua thu, dien bao. dien thoai. telex, fax. thu dien tu. dien thoai truyen hinh. may nhan tin va
Chuong 3: TruySn phat thdng tin 53 dien thoai di dong. Ngoai trir he thong ngua dua thu, tat ca cac each truyen thong tin khac d6u chua xuat hien cho den khoang 100 nam trudc day. Va san pham truyen thdng tin cudi cung trong tuong lai se la nhung chiec dien thoai di dong hinh anh.
Dudi day chung ta de cap chi tiet hon su phat trien va cach su dung cac loai phuong thuc truyen thdng tin.
1.1. Truyen thong tin bang ngua diet thu
TruySn thdng tin d Trung Q uoc thdi cd xua dSu dua vao nhung con ngua dua thu. Cac thdng tin duoc chuyen bdi nhung ngudi dua thu ngoi tren lung ngua. Bat cu khi nao mot ngudi dua thu den tram dua thu doc dudng thi anh ta lai doi mot con ngua khac de anh ta co the di khoang 500km mot ngay. Trong lich su, Trung Quoc rat rong nhung lai thieu mang ludi thdng tin lien lac, vi the ma viec dua th u bang ngua duoc xem nh u la mot phuong phap truyen thong tin thuan tien va nhanh chong.
Tuy nhien, loai truyen thong tin nay chi duoc su dung bdi cac vien chuc, va no khdng co gia tri ddi vdi ngudi dan thudng.
1.2. Dien bao va dien thoai
Dien bao ra ddi vao khoang thdi gian cung vdi ky thuat chup anh. Nam 1837, Samuel Finley Breese Morse lan dau tien gidi thieu trudc cong chung viec thdng tin lien lac bang dien bao. O ng da sang che ra m a mode, su dung mach hd va m ach kin de bieu hien nhung ki hieu cua so khong va so mot. Nhung ki hieu nay cd the duoc ket hop vdi cac loai ma khac. Bang viec giai ma, chung ta cd the biet noi dung cua thdng tin da duoc truyen phat. N hung phuang phap nay yeu cau thiet lap nhung dudng vong