Features (variable) ranking/selection

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Mihnea 2014-4-12

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评论： Mihnea 2014-4-12

Hello,

I am working on a mood detection from audio files algorithm and I need to compare results in variables (scalar) then display an answer based on that comparison.

For example: if variable1 = 1 and (variable2 = 1 or variable2 = 2) then display 'x'.

The problem is each variable has a different weight when I am displaying the results (i.e. variable1 weighs 40% and variable2 weighs 50%).

Is there any way to do this using any MATLAB functions?

I've turned the Internet upside down looking for an answer but couldn't find anything that would help me.

Thank you in advance for your help!

Kind regards,

Mihnea

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Jan 2014-4-12

编辑：Jan 2014-4-12

It is not clear how the weights are connected to your question. What does it mean for the IF-statement, that variable2 has a weight of 50% (by the way, 50% of what?)?

Do you have a fair application for this program? Or is it thought to support the NSA to detect phone calls of angry European persons?

Mihnea 2014-4-12

编辑：Mihnea 2014-4-12

There are five variables (dynamics, tempo, pitch, keymode and timbre) each with a different importance when it comes to finding the mood of a song.

It is supposed to contribute towards understanding how features of an audio signal influence actual music (tempo, pitch, etc.). It is a final year project.

The if statement part is stupid but I couldn't explain it any other way.

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Answer 1

Image Analyst 2014-4-12

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在 MATLAB Online 中打开

As you can see by now, you're making yourself clear and no one knows what you mean. I just thought I'd add my guess to the mix. Create a weighted value, then threshold it.

value = weight1 * dynamics + ...
        weight2 * tempo + ...
        weight3 * pitch + ...
        weight4 * keymode + ...
        weight5 * timbre;
if value > someThreshold
  % Do something.
else
  % Do something else.
end