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Questions and Comments for

DTFT of a Cosine Sampled Above and Below the Nyquist Rate

A slecture by ECE student Sahil Sanghani



Please post your reviews, comments, and questions below.



  • Review by Yijun Han

The derivations are clear and concise. When sampling at a sample frequency below the Nyquist rate, the reason why aliasing occurs is well explained. But there is a typo on the second figure. The frequency of the last delta should be 2pi*330/550 instead of 2pi*770/550.


  • Review Soonho Kwon

I like the fact that you have used specific numbers for the example part. By doing so, it was actually very easy to understand. However, I wish there were a little bit more explanation of how the equations progress.


  • Review by Fabian Faes

I thought that the derivations and the graphs were very well explained! I thoroughly enjoyed the use of color on the separate graphs for above and below sampling the Nyquist rate and how the two graphs were brought together for the conclusion. The overall flow of the slecture was good and the layout clear, I cannot find any foults other than the previous mentioned small typo. Great work!


  • Review by Michel Olvera

I really liked your Slecture! The examples that you used and the step by step solutions provided are very well explained and helped me review this topic.


  • Review by student 5
    • Author answer here

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Basic linear algebra uncovers and clarifies very important geometry and algebra.

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