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Unit 2 - Analouge and Digital Data
Unit 2 - Analouge and Digital Data
15
Computer Science
12th Grade
01/20/2014

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Term
Analogue
Definition
A waveform representing data. Varies over time, sine wave.
Term
Digital
Definition
A square waveform representing data. Discrete 1 or 0, light on or off, high voltage or no voltage.
Term
Convert AD DA
Definition
A modem converting computer digital data into telephone analogue data waveforms. (Also used in audio MP3 player - head phones = DA or Voice to MP3 file = AD)
Term
Binary
Definition
Either a 1 or a 0 used to represent data.
Term
Bit
Definition
1 binary number either a 1 or a 0.
Term
Byte
Definition
8 bits e.g. 11001110 = data = the ASCII code for a character.
Term
Word
Definition
A numbner of binary characters which represent a character. 4 bit word or more common a 8 bit word.
Term
Binary Headings
Definition
1,2,4,8,16,32,64,128 (8 bit binary numbers)
Term
Convert Binary to decimal
Definition
Write down the binary headings, slot binary number underneath, multipy and add up.
Term
Decimal to Binary
Definition
Write doen the binary headings, repeativly devide decimal by each heading.
Term
Kilobyte
Definition
1000 bytes (approx.)
Term
Megabyte
Definition
1,000,000 bytes (approx.)
Term
gigabyte
Definition
1,000,000,000 btyes (approx.)
Term
terabyte
Definition
1,000,000,000,000 bytes (approx.)
Term
petabyte
Definition
1,000,000,000,000,000 bytes (approx.)
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