# 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)

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