data representation

data representation

1. binary

   • overflow error
     • the number needed more that a byte a number would be lost
     • If binary right shift and lost a number it round down
       • less accuracy
   • why do computer use binary
     • logic gates
       • true or false represented by 0 and 1
         • and, or, not gates
     • circuit
       • on and of represent by 0 and 1

2. compression

   • lossy
     • some data will be lost
     • human cannot notice
     • picture video music
   • lossless
     • nothing will be lost
     • a dictionary to compress it
     • word documents

3. resolution

   • bit depth
     • more closer to the original sound
     • have more record]
     • larger file size
   • image
     • concentration of pixel in a specific area
   • sound
     • bit depth*sample rate