"merve " <email@example.com> wrote in message news:firstname.lastname@example.org... > I have got a .txt file which includes dtmf and a frequency 44100 hz. I > have to plot the original signal in time domain and then find the power > spectrum and finally determine the telephone number. I tried to plot the > original and i could manage, i think but the rest job is still a mystery > for me, i mean i dont know MATLAB well. I was told to use also a > window(rectangular, hamming,..). I need to plot power spectrum in a > restricted time. An idea?
This sounds like homework or a school project. Because of that I recommend asking the professor or teaching assistant who told you to use a window for help understanding what you need to do and how to do it. That way if they ask this on an exam, you will be prepared.