Input devices, Basic Computer Science

Assignment Help:

Input Devices:

i)  Keyboard is the most common form of input devices. It was originally designed in the last century. Since then, only minor improvements have taken place in key board design. 

ii)  Pointing devices: These are used to indicate a point on a screen for example, to make a selection from a menu. They include: The light-pen (where the tip of the pen is touched on. the screen); The touch-screen (touched directly by finger, pen etc.), and the mouse (moved around the desk or other flat surface to move a cursor on the screen, with the required position marked by pressing a button on mouse). These devices will obviously work with appropriate interactive computer software. 

iii)  Voice input is now in a stage of development where commercial systems are becoming available. It may take some more time for these systems to be trained to recognise each user's voice and are presently limited to vocabularies of a few thousand words. In other words, voice input is only in experimental stage of development. It may take some years before it is made operational.  

iv)  Barcodes  These incorporate information in a pattern of stripes, produced and read by special equipment. These are widely used in library issue systems and are slowly gaining wider use for general data transfer, particularly as a means of 'publishing' computer programs. To the extent they are used in library automation, they can be considered as data input devices. 

v)  Optical Character Recognition This method has now developed to a stage, when it can be used as a practical means for routine entry of large quantum of print on paper information into computer systems. Unless special steps are taken, error rates are very high in this technique. Hence, standardisation of input is highly necessary.  


Related Discussions:- Input devices

Explain the different methods of encryption technique, Problem When a d...

Problem When a data is sent across the network it is encrypted and arranged in a way that even if there is a diversion in the flow of data should not leak the data. At the rece

Encoder, What is an encoder? Draw the logic circuit of Decimal to BCD encod...

What is an encoder? Draw the logic circuit of Decimal to BCD encoder and explain its working.?

Alternative approaches for acquiring software, Alternative approaches for a...

Alternative approaches for acquiring software: There are some alternative approaches for acquiring software. They are:  i)  'off the shelf' software package  ii)  'turnk

Homework , Using only the digits 1-6 how many five digit numbers can be for...

Using only the digits 1-6 how many five digit numbers can be formed? How many of these have at least a 5? How many of them have either no 5 or no 6?

Software development, requirement analysis and specification for online vot...

requirement analysis and specification for online voting

Sma* search - artificial intelligence, SMA* Search-Artificial intelligence ...

SMA* Search-Artificial intelligence IDA* search is good from a memory point of view. actually it may  be criticised for not using enough memory - utilizing  more memory may inc

Differentiate Preemptive and Nonpreemptive Scheduling?, The Scheduling algo...

The Scheduling algorithms can be divided into two parts with respect to how they deal with clock interrupts. 1) Nonpreemptive Scheduling: A scheduling

Purchasing a database program, When purchasing a database program, you must...

When purchasing a database program, you must have a clear idea of what you need it for. Ask yourself the following questions. (1) Will it perform all (he operations necessary f

What are the three basic security provided by ssl, QUESTION (a) Can SSL...

QUESTION (a) Can SSL be used to encrypt email data? Justify your answer (b) What are the three basic security provided by SSL? (c) State the port number used by applicati

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd