User:Sgokhale

eL4C51 Workshop Homepage

= My Profile =

Professional Background
Working in the Indira Gandhi National Open University as a Physics Teacher for more than a decade. Involved in creation of Distance Learning material for under-graduate and post-graduate programmes.

Also involved in discipline based research in the field of Nanotechnology.

Education
M.Sc. (Physics) [Pune University, India]

Ph.D.(Physics- Materials Science) [Pune University, India]

L.L.M. (Intellectual Property Rights) [Turin University, Italy]

Photos
= My Projects =
 * --Shubha Gokhale, IGNOU, India 07:45, 4 October 2011 (UTC)
 * --Shubha Gokhale, IGNOU, India 07:45, 4 October 2011 (UTC)

Introduction
We always communicate with others, may be by directly talking, if the person is nearby or by using modern technological tools, if the person is stationed far away. Communicating with each other is a characteristic of most of the living creatures in the world. The word communication implies that there is some information, which one entity wants to pass on to the other. In the animal kingdom, the communication is used mainly for two purposes:

You must have noticed that these communications are based on mainly four domains in Physics, viz. mechanical, chemical, optical and electrical.

Human beings possess two very strong means of communication. Our mouth (with tongue and throat) has a special structure to produce about 10 vowels and 35 to 40 consonants very distinctly; and thus we, particularly Indians, have come out with phonetic languages. The sounds produced by mouth are heard (sensed) by our ears.

We also use light signals, as we have a very good optical sensor in the form of eyes, but for this, we need some external source of light like the sun, lamps etc. Though we make use of purely mechanical signals for very small distances like tapping on shoulder (direct contact), more often we use opto-mechanical signals like nodding or hand-gestures for calling or by showing a picture. Sometimes direct optical signals are used; e.g. light signals for traffic control. Thus, in general, we use sound (audio frequencies: 20 Hz to 20 kHz) and light (visible: red to violet) as the main modes for non-contact communication. In audio communication, the information in the form of sound signal reaches our ears as a series of sounds one after the other. This is a serial communication. Our eyes can process a picture or view, which is in 2 or 3 dimensions. That is, it accepts the information in a parallel form. These are the two major modes of information transport in communication.

IIn modern era we use electronic modes of communications. These include elephone, radio, television, cellular mobiles and communication via computers. Though these are different types of communication tools, the basic building blocks of any communication system are broadly the same. There is always a source of signal. This signal is first converted into electrical form and then processed through electronic circuit, in order to make it suitable for transmission. This processed signal is then transmitted through a medium of transmission like free space, metal wire, optical fibre etc. Once the signal reaches the destination, the receiver has a circuit that converts the received signal back into the form which is understood by human perception.



Objectives
After studying this unit, you should be able to: • describe the various forms of communications in nature; • explain the basics of human communication; • distinguish and compare audio (serial) and visual (parallel) signals; • draw the block diagram of a typical communication system and describe the significance of each block; • explain the modern communication terminology; and • list the various media used in communication. --Shubha Gokhale, IGNOU, India 06:34, 26 September 2011 (UTC)

Communications(Curtsy: Wikipedia via Ravi Limaye) Communications Media(Curtsy: Wikipedia via Ravi Limaye) Blog created for this course Animation showing data transport in computer networks --Shubha Gokhale, IGNOU, India 07:29, 28 September 2011 (UTC)

Optical Fibre in Communication (Power Point Presentation) --Shubha Gokhale, IGNOU, India 11:42, 29 September 2011 (UTC)

Assignment
Test Questions --Shubha Gokhale, IGNOU, India 07:23, 4 October 2011 (UTC)

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= My Reflection =

= Feedback &amp; Notes from my WikiNeighbours =



Thanks Ravi for providing the links on my project.--Shubha Gokhale, IGNOU, India 06:47, 28 September 2011 (UTC)

Hello Dr. Shubha Gokhale, your user page is very informative .Congrats.Veena Dhume.