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Ch. 7 FIT5, CIS 110 13F
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Ch. 7 FIT5, CIS 110 13F
1.
Chapter 7 Representing Information
Digitally Monday, October 28, 13
2.
“Bits of Theory/Bytes
of Practice” -- A.K. Dewdney Logic is the foundation of both reasoning and computing. By associating true with presence & false with absence, we can use the physical world [signals] to model the logical world (symbols), and vice-versa. This [is the Fundamental Principle of] Information Technology. -- p. 195, Ch. 8, FIT5 Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
3.
Fundament Principle of
IT Logic is the foundation of both reasoning and computing. Web Field Trip Logic Gates: Logical AND (http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/and.html) => Nine Rungs of the IT Inferno (http://ix.cs.uoregon.edu/~michaelh/110/inferno.html) Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
4.
Digitizing Information • represent
information with digits • Digit: 0 .. 9 (Decimal Digit) • Digitizing: use whole numbers as symbols • BIT: 0 .. 1 (BInary digiT) • Hex Digit: 0 .. 9, A .. F Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
5.
Copyright © 2013
Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
6.
Fundamental Information Representation • Computers:
combine the physical (actual) world with the logical (virtual) world • Representation => from signal to symbol • Physical world: the most fundamental form of information is presence or absence – P/A, On/Off, 1/0, T/F Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
7.
Fundamental Information Representation • In
the logical world, concepts of true (T) and false (F) are important • Logic: foundation of reasoning • Logic: foundation of computing • The physical world (machines) can represent the logical world by associating “true” with the Presence of a phenomenon and “false” with its Absence Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
8.
The PandA Representation •
PandA: the code used for two bits of physical information: – Presence – Absence Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
9.
The PandA Representation •
The presence or absence can be viewed as “true” or “false” • Such a formulation is said to be discrete vs. continuous • Signals are continuous • Symbols are discrete Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
10.
A Binary System •
The PandA encoding has two bits: present & absent • Two bits make binary • There is no law that says on means “present” or off means “absent” – convention – interpretation Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
11.
Bits Form Symbols •
The PandA unit is a bit “binary digit” • Bit sequences can be interpreted as numbers or other information • Groups of bits can represent symbols – (eg) ASCII Character Code Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
12.
Bits in Computer
Memory • Memory is arranged inside a computer in a very long sequence of bits • Memory locations are electronic (RAM) • Bits are stored as Presence/Absence • Symbolic representation: 1/0 Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
13.
Sidewalk Memory • sidewalk:
strip of concrete with lines across it forming squares • presence of a stone: 1 • absence of a stone: 0 => sidewalk: a sequence of bits Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
14.
Sidewalk Memory Copyright ©
2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
15.
Sidewalk Memory 0 1 0 1 Copyright ©
2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13 0 0 1 0
16.
Sidewalk Memory • To
write a 1: put a stone on a square • To write a 0: sweep the sidewalk square clean Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
17.
Alternative PandA Encodings •
There is no limit to the ways to encode two physical states • “One if by land, Two if by sea.” – Paul Revere Code – Binary • Git, Whoa! – Conestoga Code – Binary Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
18.
Encoding Information w/
Bit Patterns • bit patterns of length 1: => encode 2 symbols • bit patterns of length 2: => encode 4 symbols • bit patterns of length 3: => encode 8 symbols ... • bit patterns of length n: => 2n symbols • adding 1 bit doubles number of patterns Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
19.
Bit Patterns of
Length 4 = One Hex Digit Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
20.
Hex Digits Explained •
hexadecimal digits are base-16 numbers (24 = 16) • using bit patterns is tedious & error prone 1111 1111 1001 1000 1110 0010 1010 1101 • one hex digit = 4 bits => shorthand representation FF98E2AD Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
21.
Hex to Bits
and Back Again • Easy to translate between hex and binary – 0010 1011 1010 1101 2 B A D – F A B 4 1111 1010 1011 0100 Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
22.
Digitizing Numbers using
Binary • The two earliest uses of PandA were to: – Encode numbers – Encode keyboard characters • Same principles apply to sound, images, video, etc. Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
23.
Decimal Numbers, Place
Values • • • • numbers use a place value representation each “place” represents a power of 10 (binary numbers use powers of 2) 1,010 in decimal: Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
24.
Binary Numbers, Place
Values • 10102 = (1 × 8) + (0 × 4) + (1 × 2) + (0 × 1) = 1010 Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
25.
Binary Numbers, Place
Values 1,01010 = 0011 1111 00102 Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
26.
Digitizing Text • The
number of bits determines the number of symbols that can be represented – bit patterns of length n => 2n symbols • The more symbols you want encoded, the more bits you need Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
27.
Digitizing Text (Characters) •
To represent 95 distinct symbols • uppercase, lowercase, digits, punctuation, etc. • we need 7 bits – 26 = 64 symbols – 27 = 128 symbols • plus additional characters => ASCII-8 Character Code – 28 = 256 symbols Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
28.
Copyright © 2013
Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
29.
Extended ASCII: An
8-Bit Code • Handling other languages is solved in two ways: – ASCII-8 – Unicode-16 • IBM named 8-bit sequence a byte • ASCII-8: One Byte/One Character • RAM: one memory location = 4 Bytes Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
30.
Why “Byte”? • IBM
was building a supercomputer, called Stretch • They needed a word for a quantity of memory between a bit and a word • A word of computer memory is currently 32 bits Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
31.
Why “Byte”? • Then,
why not bite? • The ‘i’ to a ‘y’ was done so that someone couldn’t accidentally change ‘byte’ to ‘bit’ by the dropping the ‘e’ ” – bite – byte bit byt (the meaning changes) (what’s a byt?) Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
32.
Ch. 7 Assessment: Learning
Outcomes - Know the following Copyright © 2013 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Monday, October 28, 13
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