First was non technical phone interview then next week was technical phone interview which lasted for 1 hr. Most questions were pretty similar to the ones posted I'll list the ones different. What are stochastic processes? What is autocorrelation, cross correlation, convolution and how are they different from each other? what is PSD? how do u calculate it? Taps needed in IIR and FIR filters less or many? What is malloc and calloc difference between the two what does start.m file do and finish.m how to save the workspace data? how to load the workspace data? what format it saves in and what does that mean?

There were three phases for recruiting procedures. The first stage was a brief and relaxing conversation, the second stage was about technical things and hiring manager asked several questions in the third stage.