1 / 24

Sound Sensation Lab

Sound Sensation Lab. SPARK Saturdays Hui Jun Tay & Ameya Kamat. Sound. Sounds are vibrations that propagate in air Think ripples in a pond, waves on a beach. Sine Waves. Amplitude. Measured in Decibels (dB) Loud noises have “bigger” vibrations

avital
Download Presentation

Sound Sensation Lab

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Sound Sensation Lab SPARK Saturdays Hui Jun Tay & AmeyaKamat

  2. Sound Sounds are vibrations that propagate in air Think ripples in a pond, waves on a beach

  3. Sine Waves

  4. Amplitude • Measured in Decibels (dB) • Loud noises have “bigger” vibrations • Hitting a ruler hard vs hitting it softly

  5. Microphone Loud sounds -> higher amplitude variation Louder sound hits the microphone -> higher voltage -> stronger signal Changes in pressure (due to vibration) correspond to changes in voltage

  6. Speakers • Basically work in reverse • Based on voltage, generate vibrations

  7. Sound of a Sine Wave “Pure” tone

  8. Frequency • Measured in Hertz (Hz) • How fast it vibrates (cycles per second) • Faster -> Higher Pitched • Slower -> Lower Pitched

  9. Fun Facts • Humans: 20 – 20,000 Hz • Younger people can hear higher frequencies! • Dogs 20 – 45,000 Hz • ‘Mosquito Frequency’ ringtone

  10. Demo/Exporation Try different frequencies. Don’t hurt yourself!

  11. Checkpoint #1 • What we’ve learnt so far… • Sound as a Sine Wave • Amplitude • Frequency

  12. Actual Sound • Do Voices and Music sound like that? • No! • Not one ‘pure’ sine wave, but multiple overlapping sine waves

  13. Overlap +

  14. Frequency Domain The different frequencies of a given sound

  15. Different Instruments • Audacity! • Piano • Trumpet • Violin • Bass

  16. Checkpoint #2 • What we’ve learnt so far… • Sound as a Sine Wave • Amplitude • Frequency • Multiple Sine Waves • Frequency Domain

  17. Filtering “Cut off” frequencies we do not want

  18. Before and After FILTER!

  19. Audacity Demo • Filtering out an instrument • Canon in D • Violin, Cello, Guitar, Bass

  20. Audacity Demo – Low Pass

  21. Audacity Demo – Low Pass

  22. Canon in D • Four Instruments (Violin, Cello, Guitar, Bass) • Try to get • 1) only the bass • 2) only the violin

  23. Checkpoint #3 • What we’ve learnt so far… • Sound as a Sine Wave • Amplitude • Frequency • Multiple Sine Waves • Frequency Domain • Filtering

  24. Messing Around Record your voice on Audacity Apply filters, effects, anything you like Have fun!

More Related