Chapter 3: Data Representation

Chapter 3: Data Representation

1. Data and computers

   • Information vs Data
     • Information= organized data
     • Data= basic values/facts
       • Data compression
         • Bandwidth
           • bits and bytes
         • Compression ratio
         • Lossy
         • Lossless
   • Analog data
     • Continuous
     • Mercury thermometer
     • Digitalize
   • Digital data
     • Descrete
     • Pulse-Code Modulation (PCM)
     • Reclock
   • Binary Represenations

2. Representing Numerical Data

   • Representing negative values
     • Signed-Magnitude Representaion
   • Fixed-size numbers
   • Ten's complement
   • Two's complement
   • Number Overflow
   • Representing Real numbers
     • Floating point
     • Radix Point

3. Representing Text

   • Character Set
   • ASCII
     • ASCII extended
   • Unicode
   • Text compression
     • Keyword encoding
       • The, and, which, what, that
     • Run-Length Encoding
     • Huffman Encoding

4. Audio data

   • Audio formats
   • MP3
   • Vinyl

5. Representing Images and Graphs

   • Representing color
     • RBG value
   • Digitalized images and graphics
     • Pixels
     • Resolution
     • Raster-graphics format
   • Vector Represenation of Graphics
     • Vector graphics

6. Representing Video

   • Video Codecs
     • Temporal compression
     • Spatial Compression

7. Bob Bemer

8. By Ansley Patton