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15 Cards in this Set
- Front
- Back
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What is data? |
The answer lies in differences... data are differences made in some substance by some actor that make a difference, in the sense of informing some other actor. |
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What is modulation? |
Modulation is the amount of differneces made with the substances of air and water. |
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What is coding? |
Certain differences made in some substance can be coded to form symbols. |
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What are data structures? |
So data can be formed from differences made within any substance as physical symbols. Symbols are coded from such differences and formed into larger entities known as data structures. |
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What do data structures do? |
Data structures may act as messages conveyed as signals and/or such data structures may be stored in some way to record things. |
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Digital signals. |
The spoken word is an analogue signal consisting of a continuous sound wave - to transmit the spoken word over distance along communication channels such as telephone lines we transform the analogue signal using a digital code typically a bibary code. |
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What is the fundamental difference you can make with any substance? |
A binary difference. |
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Binary code/bits. |
It can shown that all other forms of coding can be collapsed into this basic form of coding can be collapsed into this basic form of coding in bits - bibary code. That is why buts are the most fundamental way in which symbols are formed as signals or data stores within ICT. |
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The medium. |
The medium or substance in which differences are made has an important bearing on the way in which data structures are used. |
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The forms of data structures. |
As records, data structures come in a vast variety of forms... Data structures may be physical forms, letters, documents and memos.. They may be electronic tablets, electronic documents, emails or texts. |
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Data structures. |
All data structures can be seen as consisting of data elements which in turn are formed of data items. |
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Where is data normally held within meodern-day? |
Within the modern organisation data is normally held in electronic databases. |
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What is the capacity of some data storage measured in? |
Its not typically measured in terms of bits but in terms of bytes. |
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What is a byte? |
A byte stands for by-eight and consists of eight bits. |
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