# I have a question on the phase of a frequency response

1. Mar 7, 2015

### great1122

Hello, I'm currently studying for an exam and came across a question I cant seem to figure out. How exactly do we go about calculating the phase of a frequency response. Here is the question, it for part A) iii.
Here are the answers to the other parts and the sketch of the magnitude:

I know you have to add the phases of the H1(w) and H2(w) to get the overall phase but I cant seem to figure out how to get the phase of each one. Any help is appreciated thanks.

2. Mar 8, 2015

### milesyoung

There's a seperate forum for homework problems and the like, so, in the future, you should try to use that instead.

For some frequency $\omega$, $H_1(e^{j\omega})$ and $H_2(e^{j\omega})$ are just a couple of complex numbers, so what is $\arg(e^{-j2\omega})$ and $\arg(4)$?