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Page history last edited by James de Winter 10 years, 5 months ago

You can also use Audacity to generate tones and then combine them.


The GENERATE TONE facility can be used to make tones and the QUICK MIX to combine them.

I believe that there are some materials as part of the 21C science course that use this idea for AM and FM


How to show beats on Audacity

  • Generate --> Tone (440Hz, I suggest 5s is enough)
  • Project --> New Audio Track
  • Generate --> Tone (441Hz, I suggest 5s is enough)
  • Play each on in turn - they are virtually indistinguishable
  • You can zoom in (see image below) to show the difference
  • Play them together, the beats jump out and slap you on the face.


Combine them to a single trace and see the beats

  • Click CONTROL+A to select both tracks 
  • The waveforms combineand the beats are visually obvious




The two tracks - can you spot the difference?



Well, ok you can if you really zoom in



The post 'Quick Mix' - Beats are obvious






Thanks to Andy Pugh




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