EEG signal analysis using FFT & PWELCH

Hello :

I've a 1.2 mb file in EDF format which has the time and amplitude data of the EEG signal. I need to perform the FFT analysis and / pwelch with hanning window of size 10 seconds. My sampling frequency is 1000hz. After performing this operation , i need to plot th spectrogram so that i can get the power of each frequency at the every particular second. I'm very new to matlab , can someone give me thee code to perform th above operation right from th begininng ( i.e; from opening the file ).

BTW , how to open an edf file for the above purpose.

Answer 1

[Star Strider]

To read them, the File Exchange contribution blockEdfLoad seems well regarded.

See the documentation for spectrogram for information on how to use it.

[Nishanth Reddy]

I'm using matlab 7.11 version , will this procedure work in there?

[Star Strider]

You should have spectrogram if you have the Signal Processing Toolbox. The File Exchange contribution should work for you, but I you will have to experiment with it to find out. I have no personal experience with EDF files.