Date: Jan 25, 2013 9:30 AM
Author: Steven Lord
Subject: Re: Determination of telephone number from dtmf
"merve " <email@example.com> wrote in message
> 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.
To contact Technical Support use the Contact Us link on