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Questions and Comments for

Discrete-time Fourier transform (DTFT) of a sampled cosine

A slecture by ECE student Yijun Han



Please post your reviews, comments, and questions below.



  • Review by Miguel Castellanos

Both of your computations are clear, and using the periodicity of cosine in the second computation helps illustrate why aliasing occurs with the second sampling period. In your conclusion, be sure to mention what axis you are rescaling. Nice job!


  • Review by Fabian Faes

I enjoyed the flow of this slecture and how the graphs fitted well with the mathematics described. However in the case of the frequency below the Nyquist rate I think it would have been beneficial to state that frequency shifting occurs due to not fitting withing 0 and pi. I did see that it was stated in the conclusion which I think is good but I still think it should be mentioned at the time of use. Overall a great job!


  • Review by student 3
    • Author answer here

  • Review by student 4
    • Author answer here

Back to ECE438, Fall 2014

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BSEE 2004, current Ph.D. student researching signal and image processing.

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