An example of time-course versus mean values comparison
Using the same example sounds (examples 1 and 2) outline sections as shown below and
score asymmetrically, first using the time course method and then using the mean-values
method. The results should look like this:





Below each comparison we also show the sections (click
).
Note that although
we did not change the threshold p-value, the sections are very different in shape and size.
The time-course method gives narrower sections that capture the sequential (diagonal)
match, whereas the mean-values method shows big blobs of similarity. In both cases we
see that the top section is surrounded by a red rectangle, indicating that the final section
is identical to the original similarity section. This is not the case with the bottom section.
You can see how the original section (blue) was modified (red) so as to trim the
redundancy with the top section -- which is also the superior one. It is superior in the
sense that it explains more similarity even though its local score is lower. This is because
multiplying the duration of the top section by its local score gives higher similarity than
that of the lower section. That is, SA+ takes into account the overall similarity explained
by each section. Note also, that although the shape of the sections is very different, the
oblique cuts through the sections are similar across methods, hence the overall score and
the partial scores are very similar. You should examine the matrix shown in the combo
button quite often, since it will help you understand what’s going on ‘behind the scenes’
of the similarity measurements. The white cross shown on top of some of the blue
rectangles signifies that this section was excluded because of redundancy.
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