Name of book : Volume 1 Experiments in Modern Analog & Digital Telecommunication
ID: 2248997 • Letter: N
Question
Name of book : Volume 1 Experiments in Modern Analog & Digital Telecommunication
Name of experiment : 4-Amplitude modulation
Question 1 In what wayis the Adder module's output now different to the signal out of the Master Signals module's 2kdz SINE output? Question 5 Why is there still a signal out of the Multiplier module even when you're not humming (or talking, eto)? Question 6 What is the relationship between the message's amplitude and the amount of the carrier's modulation? Question 7 What is the problem with the AM signal when it is over-modulated? Question 8 What do you think is a carrier's maximum modulation index without over-modulation? 1. Aminus number 2-0 4 Greater than 1AExplanation / Answer
(1) When the message signal amplitude will become greater that the carrier signal amplitude then the adder module output will different from master signal out. . this condition is called over modulation.
(5) This is due to the noise and other harmonics of the signal. harmonics means f, 2f, 3f ..... that signal interfer each other.
(6) amount of carrier modulation = (message amplitude) / (Carrier amplitude)
(7) overmodulation come when amount of modulation > 100%
In the sense of this definition, it is almost always considered a fault condition. In layman's terms, the signal is going "off the scale". Overmodulation results in spurious emissions by the modulated carrier, and distortion of the recovered modulating signal. This means that the envelope of the output waveform is distorted.
(8) Max modulation without over modulation is 1
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