AM modulation and demodulation
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develop a MATLAB script to simulate the modulation of 20Khz carrier with a 0.4Khz modulation wave. use modulation index of 50 percent and a sampling rate of 160Khz
An envelop detector is assumed of have a forward resistance Rf of 25 ohms and a capacitance of 0.01 uF the source resistance is 75 ohms and the load resistance is 10 ohms
what is the charging time constant? compare this time constant to one period of the modulation wave and comment on how well it should track the envelope
what is the capacitor discharge time constant . compare this to one period of the carrier wave using a linear approximation what function of the capacitor voltage decays during one sample period ?
10 Comments
Walter Roberson
on 26 Dec 2012
What problem did you observe in your version of the code?
malek kasho'u
on 26 Dec 2012
Edited: malek kasho'u
on 26 Dec 2012
Walter Roberson
on 26 Dec 2012
You could start by writing it in another programming language that you do know, and then translating that to MATLAB.
malek kasho'u
on 26 Dec 2012
Walter Roberson
on 27 Dec 2012
Ask specific MATLAB questions and we will either answer directly or point you to specific sections of the introductory documentation. However, algorithms are your responsibility. You have to figure out the steps to solve the problem, and we will help you make sure you use the correct brackets and so on.
malek kasho'u
on 27 Dec 2012
Edited: Walter Roberson
on 27 Dec 2012
Walter Roberson
on 27 Dec 2012
Start by defining "AM modulation" and "carrier" and "modulation wave", and "modulation index" and "sampling rate".
malek kasho'u
on 27 Dec 2012
Walter Roberson
on 27 Dec 2012
Google, or Wikipedia, or consult the texts for your course. The texts for your course would probably be best, in that if they happen to give a different formula then it will be the one in the texts that your professor expects you to use.
Accepted Answer
Rick Rosson
on 27 Dec 2012
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on 26 Dec 2012
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