Second Week_ Session: 2 Reflextion !!!!!!!!!!!

Today I am going to write down about the reflection about week 2 session:2. In this session two we learn about:

Computer hardware basics such as storage device, I/O devices & other peripheral devices.

IInput is the term denoting either an entrance or changes which are inserted into a system and which activate/modify a process. It is an abstract concept, used in themodeling, system(s) design and system(s) exploitation. It is usually connected with other terms, e.g., input field, input variable, input parameter, input value, input signal, input port, input device and input file (file format)input devices.

Ther are so many input devices they are:

 Input Devices:

a)      Graphics Tablets

b)      Cameras

c)      Video Capture Hardware

d)     Trackballs

e)      Barcode reader

f)       Digital camera

g)      Gamepad

h)      Joystick

i)        Keyboard

j)        Microphone

k)      MIDI keyboard

l)        Mouse (pointing device)

m)    Scanner

n)      Webcam

o)      Touchpads

p)      Pen Input

q)      Microphone

r)       Electronic Whiteboard

Some of the input devices we learn about in our session is like :keyboared, pointing devices,game controllers,digital cameras,voice input,video input etc.

We also learn about different kind of scanner and reading devices.

Optical scanner: A device that can read text or illustrations printed on paper and translate the information into a form the computer can use. A scanner works by digitizing an image -- dividing it into a grid of boxes and representing each box with either a zero or a one, depending on whether the box is filled in. (For color and gray scaling, the same principle applies, but each box is then represented by up to 24 bits.) The resulting matrix of bits, called a bit map, can then be stored in afile, displayed on a screen, and manipulated by programs.Optical scanners do not distinguish text from illustrations; they represent all images as bit maps. Therefore, you cannot directly edit text that has been scanned. To edit text read by an optical scanner, you need an optical character recognition (OCR ) system to translate the image into ASCII characters. Most optical scanners sold today come with OCR packages.

Some of the name of popular scanners:

1Flatbed Scanners.there are tree types of  flatbed scanners such as:

1.  Entry-level flatbed scanners.

2.  Mid-level flatbed scanners.

3.  High-end flatbed scanners.

And the other popular scanner are :

1. High-end flatbed scanners.

2.  Video Digitizers.

3.   Miscellaneous.

4.  PhotoCD

Optical reader: An optical reader is a device found within most computer scanners that captures visual information and translates the image into digital information the computer is capable of understanding and displaying.

An example of optical readers are marksense systems for elections where voters mark their choice by filling a rectangle, circle or oval, or by completing an arrow. After the voting a tabulating device reads the votes using "dark mark logic", whereby the computer selects the darkest mark within a given set as the correct choice or vote.

Marksense is also used extensively in such areas as lotteries and multiple choice tests.

Now I am going to tell you about Output device.

Output device: 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.

 In this lesson we also learn about Printers. Printer is also one kind of output device.

Pinters: In computing, a printer is a peripheral which produces a text and/or graphics of documents stored in electronic form, usually on physical print media such as paper or transparencies. Many printers are primarily used as local peripherals, and are attached by a printer cable or, in most new printers, a USB cable to a computer which serves as a document source. Some printers, commonly known as network printers, have built-in network interfaces, typically wireless and/or Ethernet based, and can serve as a hard copy device for any user on the network. Individual printers are often designed to support both local and network connected users at the same time. In addition, a few modern printers can directly interface to electronic media such as memory cards, or to image capture devices such as digital cameras and/or scanners; some printers are combined with scanners and/or fax machines in a single unit, and can function as photocopiers. Printers that include non-printing features are sometimes called multifunction printers (MFP), multi-function devices (MFD), or all-in-one (AIO) printers. Most MFPs include printing, scanning, and copying among their many features.

There are two types of printer like: impact/ non-impact printer.

Other output device are: Audio output device,data projector,force feedback.

 Storage: storage holds data,instructions and information for future use.

A storage device is a hardware device capable of storing information. There are two storage devices used in computers; a primary storage device such as computer RAMand a secondary storage device such as a computer hard disk drive. In the picture to the right, is an example of a Drobo, an external secondary storage device.

Different types of storge such as: tape,tape drive.etc