# Calculate properties of a given Modulated Signal

I'm having a hard time trying to understand signal modulation graphics and how can I calculate/find the properties of the signal. The properties I'm talking are:

• Max. amplitude
• Carrier frequency
• the time it takes to code a bit

Can I do it just observing this two graphics? If not, can I do it using matlab? I'm a little confused since I'm used to see amplitude and frequency graphics but with bars and discrete values, not with continuous functions.

This is one of the examples I was talking and what I believe is a FSK modulation:

• You're welcome! If you only had one peak, then the signal probably wouldn't be FSK. In FSK-type signals, it is typical to have one peak per each frequency used. You could think of binary FSK as a modulation that maps a bit 0 to $\cos(2\pi (f_c-\Delta_f)t)$ and a bit 1 to $\cos(2\pi (f_c+\Delta_f)t)$, where $f_c$ is the carrier frequency (and the cosines are different from 0 only for a bit time). That is why you can assume that the carrier is the frequency between the two peaks. – MBaz Nov 23 '14 at 19:44