Engineering I have some doubts regarding AM Modulation

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The discussion revolves around the correctness of the spectra for DSB-SC and SSB modulation. Participants confirm that the provided spectra appear accurate, particularly for SSB and DSB-SC. There is some uncertainty regarding VSB, but reference materials from Stanford are suggested to clarify this. One participant notes that the DSB spectrum may actually represent DSB-SC due to the absence of a visible carrier peak. Overall, the insights provided aim to validate the understanding of the modulation types discussed.
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Homework Statement
I have some doubts regarding AM Modulation. Here's what I understood, could someone please what I wrote below?
Relevant Equations
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28t%29%3D%20V_c%20sin%20%282*%20%5Cpi%20f_c%20t%29.gif


3) Suppose, V DSB-SC as follows:
1616458880168.png

Are the following spectrums correct? The carrier frequencies are given as an example.
?hash=3f631ed8b446fd9a277ed7de9335c10e.png
1616458951061.png
 

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Fatima Hasan said:
Are the following spectrums correct? The carrier frequencies are given as an example.
The SSB and DSB-SC spectra look correct to me. I wasn't too familiar with VSB, but a quick google led to these lecture notes from Stanford (here). There is an image (shown below) in the notes which supports your understanding of VSB, so I think you are correct.

(I think the DSB may be DSB-SC as I cannot clearly see the carrier peak shown)
Screen Shot 2021-03-24 at 1.18.54 PM.png


Hope that is of some help
 
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Thread 'Why wasn’t gravity included in the potential energy for this problem?'

Thread 'Why wasn’t gravity included in the potential energy for this problem?'

I’m looking at the attached vibration problem. The solution in the manual includes the spring potential energy but does NOT include the gravitational potential energy of the hanging mass. Can someone explain why gravitational potential energy is not included when deriving the equation of motion? I tried asking ChatGPT but kept going in circles and couldn't figure out. Thanks!
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