Lecture #15 - Spectral Analysis

Question 1

Describe how a chirp signal looks like

Answer 1

Over a short interval, the signal looks like a sinusoidal, but the spacing between peaks becomes smaller and smaller as time progresses

i.e. increases frequency with time

Question 2

What does a shorter window do in spectral analysis?

Answer 2

A shorter window can improve the ability to resolve events in the time dimension by shortening the window

Question 3

Describe the consequences of having a shorter or bigger window in spectral analysis

Answer 3

1. Shorter window; better resolution in time frequency
2. Bigger window; better resolution in frequency domain