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tutorial:plot_a_time-frequency_representation_and_power_spectrum_of_a_single_channel [2012/12/10 11:11]
Rick Jansen
tutorial:plot_a_time-frequency_representation_and_power_spectrum_of_a_single_channel [2014/04/07 23:56] (current)
Simon-Shlomo Poil
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 A simple way to explore your signal is to plot the time-frequency representation (TF-plot) and power spectrum. The TF-plot will tell you how the power in different frequency bands changes over time, and the power spectrum shows you the time-averaged power.  A simple way to explore your signal is to plot the time-frequency representation (TF-plot) and power spectrum. The TF-plot will tell you how the power in different frequency bands changes over time, and the power spectrum shows you the time-averaged power. 
  
-To plot a time-frequency representation and power spectrum in NBT you can use [[http://nbtoolbox.bzr.sourceforge.net/bzr/nbtoolbox/annotate/head%3A/Visualization/nbt_plot_TF_and_spectrum_one_channel.m|this function]]. Open the GUI, load a NBT signal, and go to **Visualization|Plot time-frequency plot and power spectrum of one channel**. A dialog window will ask you to specify plot parameters. You can, e.g., set the 'print PDF' to 1, and a PDF file of the plot will be saved, or you can change the frequency range. You can also change these parameters directly from the plot. +To plot a time-frequency representation and power spectrum in NBT you can use [[http://nbtoolbox.hg.sourceforge.net/hgweb/nbtoolbox/NBTrelease/file/tip/Visualization/nbt_plot_TF_and_spectrum_one_channel.m|this function]]. Open the GUI, load a NBT signal, and go to **Visualization|Plot time-frequency plot and power spectrum of one channel**. A dialog window will ask you to specify plot parameters. You can, e.g., set the 'print PDF' to 1, and a PDF file of the plot will be saved, or you can change the frequency range. You can also change these parameters directly from the plot. 
  
 Click 'OK' when you are done. A window like this will pop-up: Click 'OK' when you are done. A window like this will pop-up:
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 In the left corner you see the power spectrum, in this case a clear 10 Hz peak is present.  In the left corner you see the power spectrum, in this case a clear 10 Hz peak is present. 
  
-To compute amplitudes in several frequency bands, go to the tutorial [[tutorial:amplitude_in_classical_frequency_bands|]]+To compute and store amplitudes in several frequency bands, go to the tutorial [[tutorial:amplitude_in_classical_frequency_bands|]].
  
 ==== Command line usage ==== ==== Command line usage ====
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 </code> </code>
 will plot channel number 1 with all the default settings for the other parameters.\\ will plot channel number 1 with all the default settings for the other parameters.\\
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tutorial/plot_a_time-frequency_representation_and_power_spectrum_of_a_single_channel.1355137865.txt.gz · Last modified: 2012/12/10 11:11 by Rick Jansen
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