Input And Output Devices

 

From : http://www.youtube.com/watch?v=ZEyj-YorgxU

Output Devices

An output device is any piece of computer hardware equipment used to communicate the results of data processing carried out by an information processing system (such as a computer) to the outside world.
In computing, input/output, or I/O, refers to the communication between an information processing system (such as a computer), and the outside world. Inputs are the signals or data sent to the system, and outputs are the signals or data sent by the system to the outside.
Examples of output devices:

• Speakers

• Headphones

• Screen (Monitor)

• Printer

From: Computing Essentials, Complete 2011, Timothy J.O'Leary, Linda I.O'Leary 

Input Devices

An input device is any peripheral (piece of computer hardware equipment) used to provide data and control signals to an information processing system (such as a computer). Input and output devices make up the hardware interface between computer as a scanner or 6DOF controller.
Many input devices can be classified according to:

• modality of input (e.g. mechanical motion, audio, visual, etc.)
• the input is discrete (e.g. key presses) or continuous (e.g. a mouse's position, though digitized into a discrete quantity, is fast enough to be considered continuous)
• the number of degrees of freedom involved (e.g. two-dimensional traditional mice, or three-dimensional navigators designed for CAD applications)

Pointing devices, which are input devices used to specify a position in space, can further be classified according to:

• Whether the input is direct or indirect. With direct input, the input space coincides with the display space, i.e. pointing is done in the space where visual feedback or the cursor appears. Touchscreens and light pens involve direct input. Examples involving indirect input include the mouse and trackball.
• Whether the positional information is absolute (e.g. on a touch screen) or relative (e.g. with a mouse that can be lifted and repositioned)

Note that direct input is almost necessarily absolute, but indirect input may be either absolute or relative. For example, digitizing Graphics tablets that do not have an embedded screen involve indirect input and sense absolute positions and are often run in an absolute input mode, but they may also be setup to simulate a relative input mode where the stylus or puck can be lifted and repositioned.

Keyboards

A 'keyboard' is a human interface device which is represented as a layout of buttons. Each button, or key, can be used to either input a linguistic character to a computer, or to call upon a particular function of the computer. Traditional keyboards use spring-based buttons, though newer variations employ virtual keys, or even projected keyboards. Examples of types of keyboards include:
• Computer keyboard
• Keyer
• Chorded keyboard
• LPFK

Pointing devices

A pointing device is any human interface device that allows a user to input spatial data to a computer. In the case of mice and touch screens, this is usually achieved by detecting movement across a physical surface. Analog devices, such as 3D mice, joysticks, or pointing sticks, function by reporting their angle of deflection. Movements of the pointing device are echoed on the screen by movements of the cursor, creating a simple, intuitive way to navigate a computer's GUI.


Composite devices



Wii Remote with attached strap
Input devices, such as buttons and joysticks, can be combined on a single physical device that could be thought of as a composite device. Many gaming devices have controllers like this. Technically mice are composite devices, as they both track movement and provide buttons for clicking, but composite devices are generally considered to have more than two different forms of input.
• Game controller
• Gamepad (or joypad)
• Paddle (game controller)
• Wii Remote

Imaging and Video input devices

Video input devices are used to digitize images or video from the outside world into the computer. The information can be stored in a multitude of formats depending on the user's requirement.
• digital camera
• Webcam
• Image scanner
• Fingerprint scanner
• Barcode reader
• 3D scanner
• Laser rangefinder

Medical Imaging
• Computed tomography
• Magnetic resonance imaging
• Positron emission tomography
• Medical ultrasonography

Audio input devices

In the fashion of video devices, audio devices are used to either capture or create sound. In some cases, an audio output device can be used as an input device, in order to capture produced sound.
• Microphone

• MIDI keyboard or other digital musical instrument
From Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Input_device


Microprocessor.mov

What Is a Microprocessor Chip?

A microprocessor chip is a processing unit which integrates all the capabilities of a CPU into one circuit. Moving all the components of a CPU into one circuit allows for many advantageous in efficiency and up-scalability. It is this "all in one chip" design that has allowed for streamlined CPU improvements over the years in computing.

History

1. Some of the first microprocessors were used in the 1970s within calculators to perform simple mathematical calculations. As research progressed and cost of production diminished these microprocessors evolved into the CPU within every modern computing solution.

Function

2. Originally designed for specific electronics applications these microprocessors performed specialized data operations using binary instructions. With the advent of the general purpose processor however, microprocessors have grown to be able to encompass a vast array of possible applications using only one microprocessor design that supports many general purpose operations.

Benefits

3. Modern microprocessors have advanced to such a state that they aid in virtually every endeavor by mankind from missile defense systems to simple calculators. Their continued advancement and implementation have aided in countless discoveries and improvements to our way of life.

Time Frame

4. Although research was initially taking place as early as the 1920s it was not until the early 1970s that major advancements in the microprocessor's design and abilities allowed for widespread acceptance and application. Today the microprocessor market is measured in billions of dollars every year with no signs of discontinuation in sight.

Potential

5. Although the limits of physics currently limits our traditional methods used to advance microprocessor power there are new techniques such as multi-core designs and new materials such as Hafnium being used to explore ever greater advances in this seemingly unlimited technology. 

From : http://www.ehow.com/facts_5019991_microprocessor-chip.html

Image Editing Software

Image editing software has become ubiquitous in this digital age. Whether you’re creating a web interface or simply cropping and enhancing your family photos – you’ll need your favorite image editor to do it.

In this article, you’ll find the top image editing applications currently out in the market.

Pixelmator

Pixelmator is a fast and powerful image editing software for the Mac operating system. With its intuitive and beautiful Graphical User Interface (GUI), support for layers to organize your document, a large assortment of painting tools, and simple-to-use photo correction tools – Pixelmator is an excellent pick for Mac users who don’t quite need the features (and price tag) of Photoshop. 

 Inkscape

Inkscape is an open source vector graphics editor much like Adobe Illustrator, CorelDraw, and Xara X. Its default file format is web standards compliant Scalable Vector Graphics (SVG) under W3C’s specifications.

  Fireworks

Fireworks is Adobe’s image editing software for the web designers. It excels in several areas over its big brother Photoshop, namely in high-fidelity prototyping of sites and a workspace environment that’s optimized for web designers. It is also a raster and vector hybrid, being able to work with raster-based images and vector-based graphics better and more symbiotically than Photoshop.
Fireworks is a popular tool of choice for many web designers and was once voted as one of the top tools for web designers.

GIMP

GIMP – which stands for the GNU Image Manipulation Program – is a feature-packed and powerful open source image editor that can be used in all major operating systems (Linux, Mac, and Windows). It has a customizable interface so that you can easily set the view and behavior of GIMP.
It has a huge set of retouching tools that will allow you to perform advanced image retouching and manipulation. The GIMP outputs your work in many common formats like JPG, GIF, PNG, TIFF, and even PSD (Photoshop’s native file format).

Photoshop

Not surprisingly, Photoshop is the winner by a landslide, garnering over half of all the total votes. Photoshop is what comes to mind when image editing is involved there’s very little that can be said about it that hasn’t been said already.
With an insurmountable amount of features that help you manipulate and enhance photos as well as create web graphics, all while helping you manage your workflow and image editing environment – Photoshop comes in at numero uno as the best image editing software currently in the market.

Jackie Chan - Kaspersky 2010 Antivirus Commercial