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Topic A1 - Digital Devices - Coggle Diagram
Topic A1 - Digital Devices
Personal Computers
A general purpose computing device that is small and cheap enough for it to be used by individuals.
These types of digital devices are capable of performing most common computing tasks. That’s why we refer to them as being ‘general purpose’. By installing a new software application our computer becomes capable of performing a completely new function.
Personal computers contain individual processors, ram & hard disk components, along with expansion ports. This makes it very easy to upgrade our device to add additional capabilities, such as replacing the hard disk to add more storage or adding a graphics card to an expansion port to improve its graphics processing power.
Examples of personal computers include desktops & laptops.
Uses
Because personal computers are general purpose devices, they really have a wide range of functions. However, there are some particularly popular uses.
In the workplace, we often use them for word processing, desktop publishing, spreadsheets and database management systems. They’re also popular for creative tasks, like graphics, music and film editing.
This is due to the wide availability of software, good processing capabilities and the range of available input devices. For example, a mobile device doesn’t generally use a keyboard and so isn’t as useful for word processing as a desktop or laptop.
In our personal lives, they’re also commonly used for accessing the internet, such as surfing the web and email. These devices almost always come with networking capabilities which make them useful for this. They’re also used for gaming, but this requires an expensive graphics card normally.
Servers
A computer that manages access to different resources and services over a network.
Other devices, like personal computers, connect to the server via a range of means such as Ethernet cables & WiFi. This is how a network is formed. Depending on the type of server, other computers can then access the resources and services it is providing.
As a device, servers are actually very similar to personal computers. However, they commonly contain a larger storage capacity, higher processing power and larger amount of memory. Though not necessarily always.
Examples of servers include web servers, mail servers, file servers and print servers.
Uses
There are different types of servers and each has their own particular use to the business.
Web servers are used to manage access to web pages. The web server stores the web page and associated files. When a client computer makes a request for a web page to the server (by entering the web pages URL) the web server locates the correct files and then sends them back to the client.
In a similar way, mail servers manage access to email. When you write an email and press send on your personal computer, it first goes to your outgoing mail server. This mail server will then send it across the network to the recipient’s mail server where it is stored in their mailbox. When the recipients log into their email client the mail server will forward the email to their computer.
File servers store your files, such as word processing documents and spreadsheets, so that you can access them from any computer on the network. When you hear the term ‘cloud storage’, this is an example of where your files are being stored on a file server, so you can access them from any computer by logging into your cloud storage account.
Finally, print servers are used to share access to a printer. By using a print server you can send your files to print from any computer on the network. This means you don’t need to log into a specific computer to print or have a printer for every computer, which would be very expensive.
Mobile Devices
A computing device that is designed to be portable by being compact, light-weight and capable of running for extended periods on battery power. They’re also almost always capable of connecting to the internet wirelessly, either through mobile broadband or WiFi.
One key feature that helps make the device more compact & reduces power consumption is System-on-a-Chip. This is where all the core components of the computer are integrated onto a single chip. This includes the CPU, GPU and RAM.
One key feature that helps make the device more compact & reduces power consumption is System-on-a-Chip. This is where all the core components of the computer are integrated onto a single chip. This includes the CPU, GPU and RAM.
Examples of mobile devices include tablets and smartphones.
Uses
Mobile devices, especially smartphones, have become a massive part of people’s lives and are used for all kinds of tasks. Like personal computers, they’re general purpose devices, and so can turn their hand to most common computing tasks by installing different software applications, or ‘apps’.
The most common use of mobile devices is to access the internet while on the go, such as for web browsing and email access. However, we use them for many other reasons too. Playing games and organisational functions like keeping a diary of events are popular functions we use on a regular basis.
However, as these devices almost always use a touchscreen as the sole input, this makes them not practical for tasks like word processing. Also, the limited processing capabilities make them not practical for graphically intensive tasks like high-end gaming and film editing.
Entertainment Systems
Computing devices that are designed to entertain, such as watching television, listening to music and playing video games.
They usually contain good hard disk storage for storing tv/films, music & games. They also commonly have built-in internet connectivity capabilities, such as WiFi, for downloading new media directly to them, as well as to access streaming and online gaming services.
Examples of entertainment systems include digital media players, mp3 players & video game consoles.
Uses
All these devices are used in the home for entertainment. However, this covers a wide range of devices each with their own use.
Digital media players allow us to stream digital media, such as films, tv, music and images from over a network. You may be familiar with devices like Apple TV & Roku. Portable media players are similar, except instead of streaming, we download the media to the device and play it off the devices hard disk.
MP3 players are used to access & listen to 1000s of music tracks on a small portable device. It is now common to have MP4 players which can also play video too. We might also use them to listen to podcasts or other forms of auditory media.
Video game consoles allow you to play video games. We can even use the internet to play games with and against other players from all around the world.
Navigation Systems
This is a digital device that uses GPS (Global Positioning System) to provide a real-time map of our current location, as well as including route planning tools to give us directions to a chosen destination.
Often they also have added features, such as identifying traffic, roadworks and accidents that might delay your journey and take this into consideration to provide an accurate destination time.
An example of a navigation system is an in-car satnav.
Uses
In-car satnavs are commonly used instead of traditional maps to help direct you along the fastest route on your car journey. This can be integrated directly into the car’s dashboard, but is often in a standalone device. TomTom is a popular brand for these.
Nowadays we often see navigation systems built into smartphones to be used when driving, walking, cycling & taking public transport. For many people, standalone satnav devices have been completely replaced by their smartphones.
Multifunctional Devices
A multifunctional device, sometimes known as an MFD, is one that is capable of performing more than one specific function. We also often refer to these as multifunctional peripherals.
A common example of this is a peripheral device that can perform both input and output. However, it is not exclusive to this. A printer/fax is a multifunctional device, even though both functions are output.
In fact, multifunctional printers often combine several functions, such as printing, scanning, faxing and photocopying.
Examples of multifunctional devices include multifunctional printers, touchscreens, and force-feedback game controllers.
Uses
A multifunctional printer is a device that usually combines printing, scanning & faxing functions all into a single device. These are particularly popular for use in home offices for people who work from home and do not have the space or money for three separate devices.
Touch screens are used on tablet devices to allow users to input without a separate keyboard or mouse. The screen the user views on is also how they input, by touching objects on the screen or by using an onscreen keyboard.
Force-feedback game controllers are used on games consoles to allow you to control the game and receive vibration output. The vibration output is usually designed to improve the immersive experience of the game, such as rumbling in a car game when you go off track, or a fighting game when you’re hit.
Digital Cameras
This is a device that is capable of taking photo and video and recording it as digital data.
It does this by using a grid of photosensors that convert light into digital pixels that our computer can store, usually on a memory card. When we refer to a camera having a certain number of ‘megapixels’ (million pixels), this refers to the number of individual pixels of colour that are used to record an image.
The more megapixels a camera uses to record an image, the higher quality the image is. 20 megapixels is relatively common in modern digital cameras.
Most digital camera devices contain a built-in memory card slot to store the digital pictures and videos directly on the digital camera device. As the memory card is removable it allows you to then transfer them to another device such as a laptop so that they can be stored on a computer and displayed on a screen.
Examples of digital cameras include digital still cameras and digital video cameras.
Uses
One of the uses of digital cameras is to allow us to share them using a computer. We often upload pictures and videos to our social networking profiles, like Facebook or Instagram, in order to share them with family and friends. We might also send them to others through the use of email as attachments.
We also use them as we can edit the digital pictures and videos on our computer using photo & video editing software. You’ve often heard of the term ‘Photoshopping’ an image, which refers to the use of a software program called Photoshop that we can use to remove blemishes or perform even heavier changes to a photo.
Data Capture and Collection Systems
Data capture & collection systems input and store data through methods other than direct data entry (such as typing on a keyboard). Rather, the data is entered as a result of a related activity.
This allows the data to be entered into a computer system directly during the data capture stage and so greatly reduces the number of human error issues that happen when manually entering data.
Examples of data capture & collection systems include barcode scanners, optical mark readers (OMR) and magnetic ink character readers (MICR).
Uses
These devices are often used at the EPOS till in shops such as supermarkets.
Barcode scanners capture data by reading the widths of dark & light bars. We use these input product items by reading the barcode we find on the back of most products. When the barcode is read it matches it to a database of products on the computer and returns things like the price of the product.
OMR is used in shops for inputting lottery tickets. Pre-printed forms like lottery tickets are designed so that when marks are placed on it, the OMR device can detect what numbers you have selected from the marks’ location on the form.
MICR is used for verifying that cheques are legitimate. A special kind of magnetised ink is used to write a code on the bottom of a cheque. The MICR device reads the magnetic field of the characters to read the code to ensure it is a legitimate cheque.
Obviously, these types of devices are only useful for very specific reasons. They aren’t flexible enough for the general uses we want at home or even in most workplaces.
Communication Devices and Systems
A device that is used to move data between two other devices, such as two computers.
It has become almost essential for all of our computing systems to be able to communicate with each other, such as through the internet or other smaller networks.
Communication devices allow us to transmit data between devices over a network in various ways. Sometimes through wired cabling, sometimes wirelessly.
Examples of communication devices include network interface cards (NIC), wireless dongles and routers.
Uses
These devices are all used to allow you to transmit data over a network, commonly the internet, but they are also used in other types of network like a local area network (LAN).
Network Interface Cards, for example, allow data to be transferred to and from a networked computer by connecting an ethernet cable. We commonly use these with desktop personal computers.
Wireless dongles allow you to either transfer data to a router wirelessly as part of a local area network or connect to a mobile broadband network. We commonly use these with laptops. WiFi and even mobile broadband connectivity are often integrated directly into mobile devices like smartphones and tablets.
A router directs data to its correct destination over a large network. Wherever two networks meet, a router is required to direct the data in the right direction along the next network in order to reach its destination. You probably use a router at home to allow the multiple different devices in your house to connect to the same internet connection.