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Representing a Digital Signal

Computers represent data (sound, music, text, numbers, video, image) or operating instructions in binary form.

The binary system is based on the number 2; each bit position in the group is worth 2 times as much as the position to the right.

The binary number 1001 is evaluated as

$\displaystyle 1 \times 2^3 + 0 \times 2^2 + 0 \times 2^1 + 1 \times 2^0 = 9
$

Other systems include octal and hexadecimal.


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``CMPT 165: Review'' by Tamara Smyth, Computing Science, Simon Fraser University.
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Copyright © 2011-12-05 by Tamara Smyth.
Please email errata, comments, and suggestions to Tamara Smyth<tamaras@cs.sfu.ca>
School of Computing Science,   Simon Fraser University