COMPUTER SCIENCE GROUP PROJECT - PowerPoint Presentation

Slide1

COMPUTER SCIENCE GROUP PROJECT

BY:

ANABIA TAHIR

SAFA HAI

RAMISHA YAHYA

NAFEESA NADEEM

CLASS: X G

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KEYBOARD

TYPES OF KEYBOARDS:

1. STANDARD AND QWERTY

2. CONCEPT

3. MUSICAL

4. KINESIS

5.

MIDI (MUSICAL INSTRUMENT DIGITAL INTERFACE)Slide3

THEIR PRINCIPLES OF WORKING

AND

PROS AND CONS IN REAL LIFE SCENARIOS……..Slide4

WHAT IS A KEYBOARD:

A

keyboard is a typewriter-style device, which uses an arrangement of buttons or keys, to act as mechanical levers or electronic switches.Slide5

STANDARD AND QWERTY ITS FUNCTIONING:QWERTY is the most common modern-day keyboard layout for Latin script. The name comes from reading the first six keys appearing on the top left letter row of the keyboard (Q, W, E, R, T, and Y) from left to right. The QWERTY design is based on a layout created for the Sholes and Glidden typewriter and sold to Remington in 1873.

In the QWERTY layout many more words can be spelled using only the left hand than the right hand. In fact, thousands of English words can be spelled using only the left hand, while only a couple of hundred words can be typed using only the right hand

.

In addition, most typing strokes are done with the left hand in the QWERTY layout. This is helpful for left-handed people but to the disadvantage of right-handed people.Slide6

REAL LIFE SCEARIOSPROS

Fast. This is the usual reason people choose QWERTY keypad. Once you use it frequent enough, you will type word much faster than the alphanumeric one. This is very useful if you do a lot of texting or posting.

Less tiring. Since you only need to press only one key for one character, QWERTY keypad do not tire you and allow you to write complete word instead of to use short version. You will have fewer problems writing very long reply. Once you type with QWERTY keypad, you will develop hate on having to press key more than one to get certain character.

CONS

Small key. Because the manufacturer has to cramp so many key into small space, the size of the key has to make small. Some manufacturers make the button easy to press by making them round, but some actually make it hard to press just to make the design look good.

More mistyping. If your finger is big, you have higher chance of wrongly press the key next to the one you want to press. If you do this while you type fast, fixing the error may take some time.Slide7
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CONCEPT KEYBOARD:

A

concept keyboard

 is a flat board that contains a grid of buttons. Each button can be programmed to do whatever you want. An overlay sheet with pictures or symbols is placed on the grid so that the user can tell what pressing on different areas will do.Slide9

ITS FUNCTIONING:

> Like

any keyboard it needs a software driver

.

>

You plug the Concept Keyboard into your computer and you also run the driver which is called Concept plus Driver

.

>

You use Concept plus Driver to tell the computer which overlay you want. The overlay contains all the information the computer

needs.

>

When the overlay has been opened you run that program you want to use the Concept Keyboard with, e.g. Writing with Symbols 2000

.

>

Then when you press an area on the Concept Keyboard the computer will do whatever the overlay has been created to tell it to do, e.g. write the word cat.Slide10

REAL LIFE SCENARIOSPROS

ENABLES FAST DATA ENTRY

THEY ARE WATERPROOF

ARE TAMPER PROOF PREVENTING FROM KEYING INFORMATION WHICH CAN CORRUPT THE COMPUTER SYSTEM

MUCH FASTER FOR MAKING NON TEXT SELECTIONS SUCH AS MENU CHOICES ON THE TILL OF A FAST FOOD OUTLET

.

Concept keyboards are also good for people who have difficulty in using a standard keyboard. For example, older people with arthritis.

CONS

POOR FOR TEXT OR NUMERIC INPUT

LIMITED TO TE OPTIONS SHOWN ON THE KEYBOARD Slide11
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MUSICAL KEYBOARD(digital)

A musical keyboard is the set of adjacent depressible levers or keys

on a

 musical instrument.Slide13

ITS FUNCTIONING:Contain keys for playing the twelve notes of the Western musical scale, with a combination of larger, longer keys and smaller, shorter keys that repeats at the interval of an octave.

 Depressing a key on the keyboard causes the instrument to produce sounds, either by mechanically striking a string or tine, plucking a string; causing air to flow through a pipe.

On electric and electronic

keyboards ,

depressing a key connects one or several circuits.Slide14

REAL LIFE SCENARIOSPROS

The capacity to record your performance

They generally include headphone outputs to practice in private

They are able to record and replay your performance with deadly accuracy ;

Most models are smaller and considerably lighter, so much easier portability

CONS

They do not feel as if the real pianos

.” Touch

Sensitivity”

and Weighted Action

just isn’t the same thing as the advanced inner mechanism,

or action,

of the acoustic piano.Slide15
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KINESIS KEYBOARD

ITS FUNCTIONING:

The

Kinesis line of keyboards are marketed to those who type throughout the work-day, and thus perceive a higher risk for such injuries as RSI. The Kinesis was first used

among computer

programmers, who continue to be the primary market for the devices

.

Vertical key layout: Keys are arranged in vertical columns to reflect natural motions of your fingers, and the keypads are sculpted and concave to fit the varying lengths of your fingers.

Separate thumb keypads: The thumb keypad includes often used keys such as Enter, Space, Backspace, Delete and the combination keys, Control and Alt on the PC (Command and Option on the Macintosh). This redistributes the workload from your relatively weaker and overused little fingers to stronger thumbs.

Key remapping: Individual keys can be re-mapped or copied to other key locations. As a result, you can customize the keyboard’s operation for your personal use to reduce stressful reaches and establish an optimal hand workload.Slide17

REAL LIFE SCENARIOSPROS

Keyboards have special key that preform specific functions.

Instead of using the mouse to move the cursor you can use the arrow key situated on the keyboard to move the cursor on the monitor.

Keyboards are less expensive because it comes with every computer.

CONS

The people using the keyboard have to learn how to type.

The frequent movement from keyboard to move and back could cause carpal tunnel syndrome.Slide18
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MIDI KEYBOARD:

MUSICAL INSTRUMENT OF DIGITAL INTERFACE

A 

MIDI keyboard

 is typically a piano-style user interface 

keyboard

 device used for sending 

MIDI

 signals or commands over a USB or 

MIDI

 cable to other devices connected and operating on the same 

MIDI

 protocol interface

.

MIDI data can be transmitted electronically between MIDI-compatible musical instruments, or stored in a Standard MIDI File for later playback.Slide20

ITS ADVANTAGES:> VERSATILITY> A

small amount of time investment and minimal knowledge of musical theory can produce stunning results that would ordinarily be the result of painstaking effort.

> MIDI

keyboard sound quality is often proportional to the quality of the MIDI keyboard itself and the software that is translating the .MIDI file.

>

It allows you to have complete control to the millisecond during recordings. Slide21

DISADVANTAGES: MIDI keyboards at median prices do not have weighable keys and cannot reproduce the tactile experience of a traditional piano, or for that matter, an electronic keyboard. This might offer difficulties to a traditionally trained musician.

Unfortunately, software that has poor instrument samples or distortion ability can limit the special effects you can use to try to make the sound more authentic.

However, many traditional musicians and listeners consider it to be an inferior form of music, as they believe it contains less emotion a

nd does

not lend itself well to reproduction for live

performanceSlide22