The interview process includes a standard HR video interview followed by a technical phone interview.

The HR interview is the same as mentioned on Glassdoor.

The technical phone interview is similar to other questions mentioned on Glassdoor, with some new ones.

I am waiting for a response on the technical interview.

---DSP

• What is PSD and what is its relationship with autocorrelation?
• Given h[n] = [1,2,3,4,5] with an input frequency of 100 Hz and an LTI system, what is the output frequency?
• With the same input frequency, and now h[n] = [1,4,9,16,25], what is the output frequency? I answered it and was asked how.
• What is the relationship between bandwidth and time duration?
• Given a signal spectrum that is valid in the range of -pi/2 to pi/2, what is the range of frequency when the signal is oversampled by a factor of 4?
• What is the relationship between the Discrete Fourier Transform and the Z-transform?
• Given y[n] = x[n^2], is the system stable? Causal? Linear? I answered it and was asked how.

---C++

• What is a virtual constructor?
• What is a virtual function?
• Given a code with a destructor, what is the output?
• Can you define a function in a C++ struct?
• What is the default access type of a C++ struct?
• How do you concatenate two strings?

---Matlab

• Matlab code to clear workspace variables.
• There are 100 variables in the workspace. How to delete all variables except 2?
• Matlab code for matrix concatenation.
• What does the '@' symbol mean in Matlab and where is it used?
• Difference between a cell array and a struct in Matlab.

---Math

• Given a differential equation, what are its degree and order?
• Given a matrix, what are its eigenvalues and eigenvectors?