Understanding Frequency Modulation (FM), Frequency Shift Keying (FSK), Sunde’s Any modulation method that changes the angle instead of the amplitude is. Week 5- Angle Modulation, Frequency Modulation (FM), Phase Modulation (PM), Modulation Reviews for NPTEL’s Principles of Communication Systems-I. Angle Modulation – nptel – Indian Institute of Technology Madras. in. Views. 5 years ago. Frequency, · Communication, · Principles, · Institute.

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Principles of Communication Systems-I

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Principles of Communication Prof. The course material has been divided into three parts. The first three chapters, dealing with the mathematical background bptel for the course, constitute part I.

In the opinion of the author, a thorough understanding and ability to manipulate and apply this material is very essential for a proper understanding of the principles of communication presented in part II and III. In fact, this material is also quite useful in the study of digital communication, the subject matter of another course under the NPTEL program. Part II also consists of three chapters Ch 4 to 6 and deals with modulation techniques: Part III consists of a single chapter Ch 7.

The mathematical tools developed in part I and the communication principles discussed in part II have been put together to arrive at the noise performance of various modulation techniques.


Though npyel mathematical tools developed in part I have been used extensively in the development of the theory in part II and part III, detailed qngle have been provided to make the concepts and ideas clearly understandable and results hptel analyses intuitively meaningful.

Free Online Course: Principles of Communication Systems-I from NPTEL | Class Central

To cite a few of these: Flash animation has been used for the following: Oscilloscopic display of bandlimited white noise with different sweep speeds 3.

Carrier plus noise signal at the input and the output of a PLL. Audio demonstration can be found on the following: Time scaling property of the Fourier transform 2.

White noise driving a loud speaker 3. The effect of aliasing in speech and music In addition, quite a few figures shown in the text are the ones that have been generated on an experimental setup.

These illustrations, we feel are more informative and provide a better feel for the theory than the figures found in the standard textbooks. Wherever necessary, we have also provided the output of a spectrum analyzer, a very useful tool in the study of principles of communication.

In any course of this kind, examples and exercises are a must. We feel that we have included enough examples so as to enable the student to understand the material, even in situations where adequate classroom teaching is not available.


Exercises given range from fairly simple to somewhat involved. By going through the examples and working out the exercises, we feel that the candidate should be in a comfortable position to appear for competitive examinations such as GATE, UPSC, etc. Venkata Rao Every effort has been made to see that there are no errors typographical or otherwise in the material presented. However, it is still possible that there are a few errors serious or otherwise.

Communication Engineering | NPTEL Online Videos, Courses – IIT Video Lectures

The author would be thankful to the readers if they are brought to his attention at the following e-mail address: These will be promptly acknowledged and efforts would be made to incorporate the required corrections. Remember me on this computer.

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