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Friday September 30, 2011 (Week 6) - See [[Lecture Schedule ECE438Fall11 Boutin|Course Outline]]. | Friday September 30, 2011 (Week 6) - See [[Lecture Schedule ECE438Fall11 Boutin|Course Outline]]. | ||
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| − | Today we discussed how reconstructed the DTFT of a signal from its DFT. | + | Today we discussed how reconstructed the DTFT of a signal from its DFT. More precisely we obtained a "practical" formula for reconstructing the DTFT of a finite duration signal from the [[Discrete Fourier Transform|DFT]] of its periodic repetition. The formula was observed to hold whenever the periodic repetition has a period that is at least as long as the signal duration. |
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[[Category:discrete Fourier transform]] | [[Category:discrete Fourier transform]] | ||
Latest revision as of 05:18, 29 September 2014
Lecture 17 Blog, ECE438 Fall 2011, Prof. Boutin
Friday September 30, 2011 (Week 6) - See Course Outline.
Today we discussed how reconstructed the DTFT of a signal from its DFT. More precisely we obtained a "practical" formula for reconstructing the DTFT of a finite duration signal from the DFT of its periodic repetition. The formula was observed to hold whenever the periodic repetition has a period that is at least as long as the signal duration.
Action items
- Keep working on the fourth homework
- Everybody should add at least one formula/property to our DFT table.
- Keep working on the three new practice problems (and share your answers)
Previous: Lecture 16 Next: Lecture 18
