• Adobe After Effects

  radio waves syncronized to audio

  Posted by Mcmohawk on March 20, 2006 at 9:32 pm

  hi,

  im trying to create some radio waves that are syncronised to a music track, as in one comes in at the start of each bar. ive tried setting the frequency of the waves using a calculation with the bpm of the track, but this doesnt seem to work. are there any other ways of doing this?

  Rob Webster replied 20 years, 1 month ago 5 Members · 6 Replies
• 6 Replies

• 

  Joey Foreman

  March 20, 2006 at 9:41 pm

  Trapcode has a plug-in for this called Sound Keys.
• 

  Zander

  March 20, 2006 at 9:45 pm

  well your in luck it’s a pre made filter under render render radio waves

  there you will have your radio waves
  (create a solid first and apply the effect to this)
  then take your audio file, control click (right click on a pc) and select keyframe assitent then convert audio to key frames
  a new layer will open up twirl this layer open as well as effects so you can see left chanel right chanel both chanels

  from here, go back to your radio wave solid, press e to reveal effects twirl down the radio wave effect and then in there twirl down wave motion and option click (alt if your on a pc) on the stop watch for frequency.

  when the expression controls open youl see a pick whip which looks kinda like an @ sign. click this pic whip button and drag your mouse the the “both slider” under your audio keyframes.

  your done have fun!

  hope you can make heads or tales of this
• 

  Mcmohawk

  March 20, 2006 at 11:16 pm

  cheers

  if i use the keyframe assistant>conert audio to keyframes, it gives me a value depending on the amplitude, which then dosent seem to make any sense when i use the expression to link to the radio waves frequency. is there a way to edit the expression to link it to the tempo of the song or does this only interpret the amplituse?
• 

  Jim Kanter

  March 20, 2006 at 11:34 pm

  The amplitude of the audio is representative of the rhythm so if the waveforms are strong and distinct enough it should work fine.

  Jim Kanter,
  Digital Film Institute
  http://www.dfilminst.com
• 

  Mcmohawk

  March 21, 2006 at 12:05 am

  ok, ill try using that, but how do i change the value of the amplitude to relate to waves per second?
• 

  Rob Webster

  March 21, 2006 at 9:45 pm

  To help beat isolation, it may be possible to pull the audio into an audio editor, and EQ the audio to highlight beat frequencies and make them stronger, making it easier to get the radio waves to behave as you want. Then you can reimport your original audio later. SoundKeys is easiest, but if you don’t want to purchase that, then give AE the best audio you can – not the best sounding for the final video, but the best for extracting the data you need.

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