8.1.4-+Reasons+for+digital+representation+of+data


 * 8.1.4 Reasons for Digital Representation of Data **

This page contains useful information regarding reasons for digital representation of data. Terms can be viewed to the right of the page and its definitions(containing, text, pictures and videos) on the right. The Year 11 course specifications can be viewed at the top of the page. Mediums like the Internet that offer rapid sharing of digital data cause added requirements of team members such as moderators to ensure data accuracy.** || Research has found that although Internet news seems far superior to printed news, that Internet news has complimented printed newspapers and in fact increased sales through using the Internet as a marketing tool.** || //"An//** **//optical disc//** **//storage//** **//media format. Its main uses are//** **//video//** **//and//** **//data//** **//storage. DVDs are of the same dimensions as compact discs (//****//CDs//**//**), but store more than six times as much data." -** **http://en.wikipedia.org/wiki/DVD**// __ __** || Modern day printers such as the Canon D620 combine the features of Fax, Printing and scanning. This technology uses digital transmission techniques far advancements from the original fax machine that used analogue signals to transmit over distances. ** **http://www.capitolfax.com/fax_6.jpg** **http://www.computeroutlet.com.au/photocopiers_files/canon620photocopier.jpg** || Media retrieval systems can come in forms to cater for Digital, analogue and digital/analogue media.** **Wikipedia - Digital Asset Management** || ****Revision Quiz - 8.1.4 Reasons for digital representation of data**** media type="youtube" key="kR7227_ndqQ" height="385" width="480"
 * **Students learn about:** || **Students learn to:** ||
 * * the need for quality data, including:
 * accuracy
 * timeliness
 * accessibility
 * current data digitising trends, for example:
 * newspapers on the Internet
 * telephone system
 * video on DVD
 * facsimile
 * media retrieval management || * explain why information technology uses digital data
 * describe advantages and disadvantages for the digital representation of data ||
 * Read Me **
 * ** Term ** || ** Explanation ** ||
 * **The Need for Quality Data** ||  ||
 * * **Accuracy** || **Accuracy is a major issue for digital representation of data, due to the options of transmitting and receiving data.
 * * **Timeliness** || **With new and emerging technologies the ability for data to be constantly uploaded and updated has given the ability for data to be continually up to date, and accessed when it is required.** ||
 * * **Accessibility** || **Part of the purpose of digital representation of data is to allow the users of the system the ability to access the data when they need it, accessibility involves ensuring that the user has access to the data when they require it, for example displaying data on the Internet allows world wide access of data for all its users.** ||
 * **Current Data Digitising Trends** ||  ||
 * * **Newspapers on the Internet** || **In Internet newspapers allow readers access news articles as viewed in a newspaper, on their computer. this technology gives newspaper publishers the ability to add extra features to their articles such as videos, extra videos etc.
 * * **Telephone system** || **Wikipedia - Digital Telephone**
 * //"Digital telephony is the use of digital electronics in the provision of digital//** **//telephone//** **//services and systems. Since the 1960s a digital//** **//core network//** **//has almost entirely replaced the old//** **//analog//** **//system, and much of the//** **//access network//** **//has also been digitized. Digital telephony was introduced to provide voice services at lower cost, but was then found to be of great value to new network services such as//** **//ISDN//** **//that could use digital facilities to transfer data speedily over telephone lines." - @http://en.wikipedia.org/wiki/Digital_telephony//** ||
 * * **Video on DVD** || **Wikipedia - DVD**
 * "Digital Versatile Disc" or "Digital Video Disc"
 * * **Facsimile** || **The concept of facsimile is simply a device that can send exact copies of a page with text and images to another machine the be printed.
 * * **Media Retrieval Management** || **Media retrieval management systems integrate all of an institution's different media into a centralised system.
 * **Explain why information technology uses digital data** || **Digital data is becoming the emerging trend for Information Technology, this is due to the advantages it holds over the alternate ageing analogue methods** ||
 * **Describe advantages for the digital representation of data** || **Digital Data has several advantage over analog data, this is why the trend is becoming to switch from analog to digital data. These include:**
 * **Easier/Higher quality copying, to copy analogue data the data needs to be copied frame by frame etc. Take the analogy of a painting analogue copying would involve repainting the picture, where digital will involve copy-pasting the picture.**
 * **The above point also leads to a higher quality of digital data over analogue.**
 * //**"In a digital system, a more precise representation of a signal can be obtained by using more binary digits to represent it." -** **http://en.wikipedia.org/wiki/Digital_electronics**//
 * //**"Computer-controlled digital systems can be controlled by software, allowing new functions to be added without changing hardware. Often this can be done outside of the factory by updating the product's software. So, the product's design errors can be corrected after the product is in a customer's hands." -** **http://en.wikipedia.org/wiki/Digital_electronics**//
 * **Digital data saves on physical space, rather than having data stored on formats that take up lots of space such as Punch Cards etc Digital data can be stored on smaller mediums such as Flash disks, cds etc.** ||
 * **Describe disadvantages for the digital representation of data** || **From a transmitting and receiving sense, data represented in digital form has the disadvantages of:**
 * **//"requires greater bandwidth on a transmission line than analog data" -//** **http://www.answerbag.com/q_view/417612**
 * **Digital data can take longer to send, where analogue only needs to hold a current for an amount of time, digital needs to send a series of 1's and 0's in order to transmit the same message**
 * **Digital messages are larger than analogue**
 * **Digital data chips are more expensive than analogue**
 * **Humans are not used to processing digital data, human minds are built up to deal with analog data, due to our life's experiences**
 * **Security, digital data is transferred and updated frequently it far harder to keep secure than analogue data**
 * //**"Digital representations of continuous data can never be as accurate as the original" - Pg 65 IPT by Samuel Davis**// ||
 * __ YouTube - Analogue vs Digital, sound recording __**