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Working with text

Working with text. ASCII and UNICODE. 0 1 1 0 0 0 0 1 0 1 0 0 0 0 0 1 0 0 1 1 0 0 0 0. From the CAS curriculum. KEY STAGE 3 Representations of: Unsigned integers

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Working with text

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  1. Working with text ASCII and UNICODE

  2. 0 1 1 0 0 0 0 1 0 1 0 0 0 0 0 1 0 0 1 1 0 0 0 0

  3. From the CAS curriculum KEY STAGE 3 Representations of: Unsigned integers Text. [Key point: each character is represented by a bit pattern. Meaning is by convention only. Examples: Morse code, ASCII.] Sounds [both involving analogue to digital conversion, e.g. WAV, and free of such conversion, e.g. MIDI] Pictures [e.g. bitmap] and video. Many different things may share the same representation, or “the meaning of a bit pattern is in the eye of the beholder” *e.g. the same bits could be interpreted as a BMP file or a spreadsheet file; an 8-bit value could be interpreted as a character or as a number].

  4. Today’s session 5:00 – 6:00 Computers and text 6.00 – 7.00 Programming in Scratch

  5. Encoding and decoding See Boston University CS101 presentation – go to first lecture (whole series is good!) An excellent introduction to Computer Science and what a bit pattern might mean

  6. Text? 1010001100000011010000000111011110110010100111110 011101111011 0000000100100011011101010110010111010 000010100110000001001011 1010110100100100111110010 111100011111000000010000110001110110 0011001100110 001110110110101110110110001100001110100110001011 0 101001111000010001101010001001011111101001010000111010010000 11010011111010111010001110010011000010 10010001100011011010010 00011010001000010100000101010101110000001011001000110010010110 01000100011111100000110111010111001101110110011001111110011101 11010100010101010110011111011111000000100011001111110010000111 1000110001101111001011110010100001101 100111110110100011001101 10110011101010001111001010001001010110111101011000101011110100 01010101101101001110001111011010011011010100101010011101110000 00111001010110010010010011001111001110111111100100101101001110 10011011011010010101011010111010011011011000010101000001001101 01001111001110111001110111100101011110011110011001101010110000 0010010110 001100010101001110110000000101000011001010101001100 01011011011111001100100001001101110011000011010 01011101010001 00101010110110101001010111010110000111011110010101100011100000 00010110000011101101110101000011111001110000010111000001001011 10011111111011111110001110111100000000101000011110100101001001 111010101100001001000111011011100010000010010 0111011000101000 111000000001111011011111101110101 0100011001000000100000010000 100100000011111001101 1010101110101101000110000101001010110110

  7. Sound? 1010001100000011010000000111011110110010100111110 011101111011 0000000100100011011101010110010111010 000010100110000001001011 1010110100100100111110010 111100011111000000010000110001110110 0011001100110 001110110110101110110110001100001110100110001011 0 101001111000010001101010001001011111101001010000111010010000 11010011111010111010001110010011000010 10010001100011011010010 00011010001000010100000101010101110000001011001000110010010110 01000100011111100000110111010111001101110110011001111110011101 11010100010101010110011111011111000000100011001111110010000111 1000110001101111001011110010100001101 100111110110100011001101 10110011101010001111001010001001010110111101011000101011110100 01010101101101001110001111011010011011010100101010011101110000 00111001010110010010010011001111001110111111100100101101001110 10011011011010010101011010111010011011011000010101000001001101 01001111001110111001110111100101011110011110011001101010110000 0010010110 001100010101001110110000000101000011001010101001100 01011011011111001100100001001101110011000011010 01011101010001 00101010110110101001010111010110000111011110010101100011100000 00010110000011101101110101000011111001110000010111000001001011 10011111111011111110001110111100000000101000011110100101001001 111010101100001001000111011011100010000010010 0111011000101000 111000000001111011011111101110101 0100011001000000100000010000 100100000011111001101 1010101110101101000110000101001010110110

  8. Image? 1010001100000011010000000111011110110010100111110 011101111011 0000000100100011011101010110010111010 000010100110000001001011 1010110100100100111110010 111100011111000000010000110001110110 0011001100110 001110110110101110110110001100001110100110001011 0 101001111000010001101010001001011111101001010000111010010000 11010011111010111010001110010011000010 10010001100011011010010 00011010001000010100000101010101110000001011001000110010010110 01000100011111100000110111010111001101110110011001111110011101 11010100010101010110011111011111000000100011001111110010000111 1000110001101111001011110010100001101 100111110110100011001101 10110011101010001111001010001001010110111101011000101011110100 01010101101101001110001111011010011011010100101010011101110000 00111001010110010010010011001111001110111111100100101101001110 10011011011010010101011010111010011011011000010101000001001101 01001111001110111001110111100101011110011110011001101010110000 0010010110 001100010101001110110000000101000011001010101001100 01011011011111001100100001001101110011000011010 01011101010001 00101010110110101001010111010110000111011110010101100011100000 00010110000011101101110101000011111001110000010111000001001011 10011111111011111110001110111100000000101000011110100101001001 111010101100001001000111011011100010000010010 0111011000101000 111000000001111011011111101110101 0100011001000000100000010000 100100000011111001101 1010101110101101000110000101001010110110

  9. Text Data • Are sets of characters • Characters could be letters, digits, symbols (£, &), • Telephone numbers are text data (should be encoded as text)

  10. Morse Code • Morse code is one kind of coding system for text • Try these activities: http://ascii-table.com/morse-code.php http://www.youtube.com/watch?v=Lki3jxNLVCI http://invigorate.royalsociety.org/ks3/keeping-secrets/codes-and-code-breaking.aspx

  11. ASCII code – another coding system for text. Used by computers Note how the codes for A .. Z , a .. Z and 0 .. 9 are sequences

  12. ASCII & Unicode • ASCII uses 7 bits to encode characters • Extended ASCII uses 8 bits • Unicode uses 8, 16 or 32 bits and is usually shown in Hex. 16 bits is the most common system used.

  13. ASCII codes are a subset of Unicode Unicode uses the same code for A

  14. Explore the ASCII codes using the Insert Symbol option in MS Word What different alphabets are there? Note the character code can’t be represented in 1 byte

  15. Now try… James Robinson’s Binary Messaging System Can you create your name in ASCII? Good for binary practice as well as understanding ASCII coding

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