Data - Data Popescu 2012 1 Definition (1) Factual...

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Data 1 © Popescu 2012
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Definition (1) Factual information used as a basis for reasoning, discussion, or calculation (2) Information output [acquired] by a sensing device or organ that includes both useful and irrelevant or redundant information and must be processed to be meaningful (3) Information in numerical form that can be digitally transmitted or processed Merriam Webster 2
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Analog Data Data represented in continuous form 3
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Analog Data Data represented in continuous form 4 The Emir of Bukhara (1911) and Supervisor of Chernigov Floodgate (1909). Prokudin- Gorskii, photographer to the tsar.
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Analog Data Data represented in continuous form 5 Gramophone and records
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Analog Data Data represented in continuous form 6 Analog oscilloscope
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Analog Data Data represented in continuous form Challenges: difficult to Store Modify level of detail Transmit Replicate 7
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Digital data Data represented in discrete form, using numbers World is not discrete digital data is created through analog to digital conversion (i.e. digitization) 8
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Digitization example Goal: acquire digital data to record brightness variation at given outdoor location 9 Photodiode Analog to digital converter Timer / recorder 000000 134577 7777…
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Digitization example Goal: acquire digital data to record brightness variation at given outdoor location 10 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 0 0 0 0 0 1 3 4 5 5 6 7 7 7 7 7 6 6 6 5 4 2 1 0 0 0 0 0 0 0 0 0 2 4 4 5 5 5 5 4 3 1 0 0 0 0 0 0 3 3 3 3 3 4 5 6 7 7 7 7 7 7 7 7 7 7 7 7 7 7 6 5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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Digitization example Goal: acquire digital data to record brightness variation at given outdoor location 11 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 0 0 0 0 0 1 3 4 5 5 6 7 7 7 7 7 6 6 6 5 4 2 1 0 0 0 0 0 0 0 0 0 2 4 4 5 5 5 5 4 3 1 0 0 0 0 0 0 3 3 3 3 3 4 5 6 7 7 7 7 7 7 7 7 7 7 7 7 7 7 6 5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Row 1: summer day in IN; Row 2: winter day in IN; Row 3: summer day in AK; Row 4: winter day in AK
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Digitization examples Music encoded digitally Microphone transforms sound into current (signal) Analog to Digital Converter transforms continuous signal into discrete signal Discrete signal is recorded as sequence of numbers Digital (video) camera Scanner 12
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Advantages of digital data Easy to replicate without loss No need for “master copy” Any copy is as good as original (Napster) 13
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Advantages of digital data Good control of level of detail If brightness is desired only every 4 hours 14 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 0 0 0 0 0 1 3 4 5 5 6 7 7 7 7 7 6 6 6 5 4 2 1 0 0 2 6 7 6 2
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Advantages of digital data Good control of level of detail If only three levels of brightness are needed 15 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 0 0 0 0 0 1 3 4 5 5 6 7 7 7 7 7 6 6 6 5 4 2 1 0 0 0 0 0 0 0 1 1 2 2 2 2 2 2 2 2 2 2 2 2 1 1 0 0
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This note was uploaded on 02/27/2012 for the course CS 177 taught by Professor Staff during the Spring '08 term at Purdue University.

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Data - Data Popescu 2012 1 Definition (1) Factual...

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