The first round of interview lasted for an hour where we discussed my experience in signal processing. We talked about my projects in detail. In the end, they showed me some samples and asked my opinion in how to denoise them. This samples formed a part of my technical evaluation wherein I developed an algorithm to denoise and classify them. The second and third interview rounds, they delved deeper into various signal processing techniques and their mathematics. Questions about PCA and Kalman filters, etc. were asked.