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COSC 109 (13)

COSC 109 Ch. 1 Notes.doc

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Computer Science
COSC 109
Mona Tavakalon

COSC 109 Chapter 1 9/3/13 • Analog Data is continuous, there are in between numbers Ex. Time or temperatures have decimals • Digital/Discrete Data is limited, specific Ex. # of people, their cannot be 1.5 people • Saving something turns it into discrete data • When you choose less decimal places it lessens the data • The more decimal places the more data and you will need more space on the computer • Sampling Rate is how often you want to collect data • Quantization is the # of decimal places • Having a higher sampling rate takes longer to process • Bits are binary digits (0 & 1) • Encoding is sending a coded message • Decoding is figuring out what that message is using a key • 2^n = how many bits needed to encode message Ex. To get 16 different messages 2^n=16. n= # of bits needed, so how many bits do you need to get 16 different messages? 2^4=16, therefore you need 4 bits to get 16 messages. • 1 Byte = 8 bits, therefore 2 Bytes = 16 bits • Kilo= 2^10 • Mega= 2^20 • Giga = 2^30 Ex. 2 Kilobits= 2 x 2^10 2 Kilobytes= 2 x 2^10 x 8 since there are 8 bits in 1 Byte How to Convert Binary to Decimal: ( follow the bold letters for guidance) 1. Divide by 2 Ex. converting 19
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