Digital Data Representation Data Information Data: Symbols that represent peopel,events,things,and idea. Example:name,number,the color in a photograph.etc. Data is used by machines(Computer). Infromation: When the data is presented in a format that the peopel can understand and use it. Information is used by humans. Data representation: refers to the form in which data is stored,processed and transmitted. Data representation can use Digital or analog methods
Digital Data Representation Data & Information Data: Symbols that represent peopel, events, things, and idea. Example: name, number , the color in a photograph.etc. Data is used by machines (Computer). Infromation: When the data is presented in a format that the peopel can understand and use it. Information is used by humans. Data representation: refers to the form in which data is stored, processed and transmitted. Data representation can use Digital or analog methods
Analog Digital Digital data: is text,music,sound.etc has been converted to a separate digit 0s&1s. Os or 1s is bit binary digit Analog data: is represented using an infinite scale of values. In-between states Numeric data: age,price,years.etc. Example:1,2,3.(Decimal system)>>1000 -Base10:0,1,2,3,4,5,6,7,8,9. Binary number system: digital device use B.N.S to represent numeric data. Example:0s and 1s >1111101000 Base 2:0 and 1 512-256-128-64-32-16-8-4-2-1
Analog & Digital Digital data: is text, music, sound.etc has been converted to a separate digit 0s & 1s. 0s or 1s is bit ( binary digit ) Analog data: is represented using an infinite scale of values. Numeric data: age, price, years.etc. - Example: 1, 2, 3. (Decimal system) >> 1000 - Base 10: 0,1,2,3,4,5,6,7,8,9. Binary number system: digital device use B.N.S to represent numeric data. - Example: 0s and 1s >> 1111101000 - Base 2: 0 and 1 In-between states 512-256-128-64-32-16-8-4-2-1
How digital devices represent words and letters? Computer employ several types of codes to represent character data letters,symbols,and numerals) ASCIl,EBCDIC,and Unicode. ASCIl(ASKee)requires only seven bits (A=1000001). just 128 characters. Extended ASCll uses eight bits(A=01000001). for 256 characters. C H IN A 01000011-01001000-01001001-01001110- 01000001 Images: they must be digitized,each dot is assinged a binary number according to its color Example:Green dot =0010,red dot 1100
• Computer employ several types of codes to represent character data ( letters, symbols, and numerals) • ASCII, EBCDIC, and Unicode. • ASCII(ASKee) requires only seven bits (A= 1000001). just 128 characters. • Extended ASCII uses eight bits (A= 01000001). for 256 characters. C H I N A Images: they must be digitized, each dot is assinged a binary number according to its color Example: Green dot = 0010 , red dot = 1100 How digital devices represent words and letters? 01000011-01001000-01001001-01001110- 01000001
Sound Analog is smooth curve. Digital is sliced in vertical segments called samples
• Analog is smooth curve. • Digital is sliced in vertical segments called samples. Sound
Bits Bytes Bit =0 or 1 Byte=8 bits (A=01000001 Kilobyte(KB)=1024 bytes Megabyte(MB)=1048576 bytes Gigabyte(GB)=1073741824 bytes Terabyte(TB) Petabyte(PB) Exabyte(EB)
Bit = 0 or 1 Byte = 8 bits ( A= 01000001 ) Kilobyte(KB) = 1024 bytes Megabyte(MB)= 1048576 bytes Gigabyte(GB)= 1073741824 bytes Terabyte(TB) Petabyte(PB) Exabyte(EB) Bits & Bytes