I have a complex signal eg: cos(wt + phase1) + i*cos(wt + phase2) the frequency of both the waves is same. When i have a look at the phase spectrum of the above signal, i am not able to interpret the phase values. They are making no sense. I tried to determine phase shift for real signals and then for complex signal with different frequencies (eg: cos(w1t+ph1) + i*cos(w2t + ph2) ) and in these cases it was possible for me to interpret correct phase values. Could some one please guide or hint me int this direction. i am trying hard to understand it!! Thanks in advance!!