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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

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Sound Sensation Lab

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  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!

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