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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
Amplitude Measured in Decibels (dB) Loud noises have “bigger” vibrations ◦ Hitting a ruler hard vs hitting it softly
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
Speakers Basically work in reverse ◦ Based on voltage, generate vibrations
Sound of a Sine Wave “Pure” tone
Frequency Measured in Hertz (Hz) How fast it vibrates (cycles per second) ◦ Faster -> Higher Pitched ◦ Slower -> Lower Pitched
Fun Facts Humans: 20 – 20,000 Hz ◦ Younger people can hear higher frequencies! Dogs 20 – 45,000 Hz ‘Mosquito Frequency’ ringtone
Demo/Exporation Try different frequencies. Don’t hurt yourself!
Checkpoint #1 What we’ve learnt so far… ◦ Sound as a Sine Wave ◦ Amplitude ◦ Frequency
Actual Sound Do Voices and Music sound like that? ◦ No! Not one ‘pure’ sine wave, but multiple overlapping sine waves
Frequency Domain The different frequencies of a given sound
Different Instruments Audacity! ◦ Piano ◦ Trumpet ◦ Violin ◦ Bass
Checkpoint #2 What we’ve learnt so far… ◦ Sound as a Sine Wave ◦ Amplitude ◦ Frequency ◦ Multiple Sine Waves ◦ Frequency Domain
Filtering “Cut off” frequencies we do not want
Before and After FILTER!
Audacity Demo Filtering out an instrument Canon in D ◦ Violin, Cello, Guitar, Bass
Audacity Demo – Low Pass
Canon in D Four Instruments (Violin, Cello, Guitar, Bass) Try to get ◦ 1) only the bass ◦ 2) only the violin
Checkpoint #3 What we’ve learnt so far… ◦ Sound as a Sine Wave ◦ Amplitude ◦ Frequency ◦ Multiple Sine Waves ◦ Frequency Domain ◦ Filtering
Messing Around Record your voice on Audacity Apply filters, effects, anything you like Have fun!
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A sound is a wave and frequency determines pitch In your mind what is sound? Sound is an example of a mechanical wave and is produced by a vibrating object.
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Template by Bill Arcuri, WCSD Who Wants to Be a Millionaire?
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