OWN 1.26b Is the discretetime signal $x[n] = \cos \left(\frac{n}{8}\right)$ periodic? If it is, what is the time period? 

OWN 1.26c Is the discretetime signal $x[n] = \cos \left(\frac{\pi n^2}{8}\right)$ periodic? If it is, what is the time period? 
OWN 1.27a Is the system $y(t) = x(t2)+x(2t)$ memoryless, linear, stable, timeinvariant and causal?  
OWN 1.27c Is the system $y(t) = \int_{\infty}^{2t} x(\tau) \ d \tau$ memoryless, linear, stable, timeinvariant and causal?  
OWN 1.27d Is the system $y(t) = \begin{cases} 0, \ \ t < 0 \\ x(t)+x(t2), t \geq 0 \end{cases}$ memoryless, linear, stable, timeinvariant and causal?  
OWN 1.27g Is the system $y(t) = \frac{d}{dt}x(t)$ memoryless, linear, stable, timeinvariant and causal?  
Consider the system defined by $y(t) = x(t) \ u(t)$. Is this linear, time invariant, stable, invertible? 
OWN 2.6 Compute the convolution of $x[n] = \left(\frac{1}{3} \right)^{n} \ u[n1]$ and $h[n] = u[n1]$ 
Bandpassfromoldexam
DTFS
Phasefunction
Two systems
Problem5fromoldexam  There is a small mistake in the solutions to the last part. The correct answer is 450Hz,500Hz,550 Hz
Review done on Sunday, December 10, 2017 before the final exam
Fall 2017 Midterm2 Question1  Fourier Series
Fall 2017 Midterm2 Question4
Fall 2017 Midterm2 Question5
Oppenheim Wilsky and Nawab 4.21f
Problem on sampling from old exam Part 1
Part2
Old midterm DTFT question