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Beat Frequency

By • Feb 25th, 2019 • Category: Billiard Tips

Free Billiard Video –

Demonstration of amplitude modulation “beat frequency” caused by adding to sinusoidal audio waveforms of similar freuencies.

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13 Responses »

  1. YouTube usually has the other effect, doesn’t it?

  2. this helped me study!

  3. You’re welcome.

  4. seeing is believing. thank you dr. dave.

  5. You got it.

    Dr. Dave

  6. Oh, hang about. Would it be that the third graph is now 501 + 500 / 2 = 500.5 Hz? Me slow. 😉

  7. Ah, I see… sort of. What I’m trying to get with my teeny brain is this; there is the what they apparently call the envelope which is that beat frequency, the changing volume, but there is also a component that is the two parent frequencies added divided by two. Where is the latter? Much obliged.

  8. The time scale is different in the 3rd graph, as compared to the 1st and 2nd.

  9. Is the third graph what we’re hearing? It looks like higher than 500 Hz.

  10. I’m glad the video helped.

    Beat on, brother.

  11. thank you, this is really helpful. I was having trouble imagining how beat is. I get the definition and how it happened but I didn’t exactly know WHAT exactly it is until I watched this vid.

  12. I’m in mechanical engineering, but I teach mechatronics.

    The demo was done with an audio tool on the Mac. My TA created it, and I don’t know for sure what he used … I’ll ask him. This could certainly be done with LabView or Simulink.

    Pool and billiards physics is a passion and hobby of mine, but it is also one of my main “research” areas.

    Dr. Dave

  13. So are you in physics or electrical engineering? I’m a PhD student in electrical engineering myself.

    This is a great demo of beat. I especially like the frequency response at the bottom. What program was this made in? Kind of looks like Matlab & Simulink…but not quite.

    I’m also curious about how you got into studying pool and billiards. Is that work you do on the side or the focus of your main research?

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