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I have the following Mathematica animation:

Animate[Plot[k*x^2, {x, -2, 2}, 
  PlotRange -> {{-2, 2}, {-10, 10}}], {k, -2, 2, 0.1}]

I also have a sound file in the same Mathematica file, which is A VERY SHORT music clip, in "wav" format. The clip is about 32 seconds long. Now I want to integrate this sound file into the above animation:

The following command will do the job, but it will make the animation WAY TOO sluggish, and almost useless:

Animate[Plot[k*x^2, {x, -2, 2}, PlotRange -> {{-2, 2}, {-10, 10}}, 
  Epilog -> {EmitSound[snd]}], {k, -2, 2, 0.1}]

Could you please suugest a better way of doing it? Thank you very much!

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How long is the .wav file? Do you need it to play continuously during animation or only at the beginning/end ? – Vitaliy Kaurov Sep 9 '12 at 3:47
1  
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1 Answer

up vote 5 down vote accepted

This is one way to control the sound emission. Import a short .WAV file:

sound = Import[ "ExampleData/rule30.wav" ]

enter image description here

Now make sound only when your animation control reaches some value - k=0 or k=1 in this case:

Animate[If[k == 0 || k == 1, EmitSound[sound]];
 Plot[k*x^2, {x, -2, 2}, PlotRange -> {{-2, 2}, {-10, 10}}],
 {k, -2, 2, 0.1, AnimationRate -> 1, AnimationRunning -> False}]

enter image description here

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Dear Mr. Vitaliy Kaurov, Thank you very much for your help. It works. I still have a question related to your answer. I will ask you later. I was slightly confused about the use of semicolon (;) after the EmitSound[sound]] command, and all that is included within the Animate command. I have never used such within an Animate command. I will try to understand it myself - if not perhaps I can ask you again. Still, thank you so much! Tim – – Tim Sep 9 '12 at 5:31
3  
PS: You had asked how long is the wav file. Mine was about 32 seconds long. Using your method, it plays again and again without a problem. A second question is that can I cut off the music for certain values of k, and again restart it when k equals the previous values? I was just wondering. What is the Mathematica command to make a sound silent, in other words? Thanks in advance – Tim Sep 9 '12 at 5:34
@Tim , I will ponder about your question a bit. Meanwhile it maybe worth posting it as a separate question. Because it is a good question and also maybe someone already knows the answer. – Vitaliy Kaurov Sep 9 '12 at 6:49

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