Surendra prasad, department of electrical engineering,iit delhi. Jagannatham of iit kanpur explains the following concepts in principles of communication systemsi. Pdf communication systems a lecture notes by mahesh. Nptel provides elearning through online web and video courses various. Quantization, mid rise quantizer, pdf and power of quantization noise. The modulating signal contains the intended message or information sometimes consisting of audio data, as in am radio. Questions from video lectures of nptel sl no questions video number time in minutes 1 give some examples for the communication systems which use space as the channel. Rc audio generator, oscilloscope, and spectrum analyzer demonstrations with speech and radio.
Then, if xt is the signal or information that is to be transmitted by the carrier, the signal xt is encoded onto the carrier by multiplying the carrier by xt which is to say, the carriers amplitude is modulated by the signal xt. Nptel provides elearning through online web and video courses. Both amplitude and phase of ft carry information of ft. Communication system block diagram, basics and details in analog communication by engineering funda duration. This is the simplest form of modulation where the amplitude of the carrier wave is modulated by the analog signal known as. The transmission bandwidth required by dsb sc is b t2b.
Amplitude modulation am is a modulation technique where the. A method of frequency translation, recovery of base band signal, amplitude modulation, spectrum of am signal, the balanced modulator, the square law. Pradeep kshetrapal, tutorials point india private limited. Frequency modulation and phase modulation are closely related. Ask fsk psk modulation digital modulation techniques amplitude, frequency and phase shift keying duration. Lecture series on communication engineering by prof. Farshad lahouti january 20, 2003 winter 2003 uw, ece 318 lecture notes 2 information source signal modulator propagation channel signal demodulator information destination analog communication system analog signals may be transmitted directly via carrier modulat ion over. Lec 10 introduction to amplitude modulation iit kanpur youtube. Amplitude modulation early radio ee 442 spring semester. The amplitude modulation and frequency modulation are graphically shown in. Lecture notes on analogue communication techniques 1. This principle is at the heart of amplitude modulation. Demonstration with professor sandy hill from the university of massachusetts at amherst.
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