Discussion Title: Analog and Digital
- Discuss the differences between analog data vs digital data.
- Discuss two type of compression techniques; lossy and loselss compression.
THE ANSWER:
Assalamualaikum, hi everyone. From my research,
1. There are differences of analog and digital data:
Analog : use values that change very smoothly. For example is an analog clock. The analog clock shows the time with a smoothly moving second and the change is continuous. Sound waves change in a very smooth way. Other example of analog devices is microphone, headphones, loud speaker and sensors (temperature, pressure etc). Analog data is a term created to differentiate it from digital data. Records and cassette tapes are forms of analog data storage; printed documents are considered analog as well. Analog data tends to be slower than digital data, but it can also be more precise. Since analog data allows for intermediate values, some believe it provides higher quality.
Digital data: jumps from one value to the next in step by step sequence. For example is digital clock. The change is not smooth or continous. Other examples of digital devices is computer/ laptop/ ipads, mobile phone, mp3 player, digital camera. Actually, the name “digital” is given to all devices that store and process fata in form of “digits” (numbers) and also known as “binary”. Digital data is stored as ones and zeros, which may be represented in a number of ways. A charged portion of a magnetic drive may represent a one, while an uncharged part might represent a zero. CDs use microscopic grooves to represent ones and zeros. There are no intermediate values with digital data which makes it easy to transfer between different media.
the resources:
http://www.diffen.com/difference/Analog_vs_Digital
http://www.ictlounge.com/html/analogue_and_digital_data.htm
2. Two type of compression techniques; lossy and loselss compression:
Lossless and lossy compression are terms that describe whether or not, in the compression file, all orginal data can be covered when the file is uncompressed.
Lossless compression is every single bit of data that was originally in the file remains after the file is uncompressed. All of the information is completely restored.
Lossy compression is reduces a file by permenantly eliminating certain information, especially redundant information. When the file is uncompressed, only a part of the orginal information is till there. Lossy compression is generally used for video and sound where certain amount of information loss will be detected by most user.
The resouces:
http://whatis.techtarget.com/definition/lossless-and-lossy-co
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