2D DVD maps
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2-D DVD maps of features


Click 'open table', select 'bird109' and click 'DVD Play/Stop'. You should see and image like the one presented below:
Only syllable with longer or shorter duration than those thresholds are shown
File name containing the current syllable 
Date and time of current syllable 


 
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Date and time of current syllable 
X-axis feature presented 

Y-axis feature presented




Each red dot represents a syllable, the X axis is 'duration' by default, and the Y axis is mean FM. Note that feature units are scaled, with median at 0 and with a spread of a single MAD (median absolute deviation) unit. The beginning of the movie is also the beginning of song development, when songs syllable are relatively unstructured.

Click at the long slider at the bottom, it should turn yellow, and move its thumb to the right, about ¾ of the way. The movie should now look very different:
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             We can see 3 nice clusters, which correspond to the 3 syllable types of the song produced. To see other features of those clusters click on the Y-axis feature choice (you can do this as the movie is playing). Clicking on the pitch shows different projections of the clusters. Moving the mouse into the movie image will show a hand pointer, indicating that you can move the image as desired. On the bottom right you will see a radio-group with 3 choices: rotate, pan and zoom - try them all during the movie play.


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At this point, our notion of clusters is informal, but in the next chapter you will learn how to use SA+ to automatically identify the clusters. In this example, we already clustered the data. To view the clusters select the 'color by cluster' from the color scheme. You can now see those syllables that we did not cluster in grey color, and those that were clustered by different colors. In the syllable table, each cluster is identified by a number, and these numbers correspond to the following colors:

l  Red;                  2 Blue;                        3 Yellow;                    4 Lime;            5 Black;                                                   6 Fuchsia;           7 Olive;                       8 Silver;      9 Green;          10  Aqua;

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Looking at DVD maps after clustering is a useful method for validating that the outcome of the clustering is reasonable.
  

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