Sound Sensation Lab SPARK Saturdays Hui Jun Tay & Ameya Kamat.
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Transcript of Sound Sensation Lab SPARK Saturdays Hui Jun Tay & Ameya Kamat.
![Page 1: Sound Sensation Lab SPARK Saturdays Hui Jun Tay & Ameya Kamat.](https://reader030.fdocuments.in/reader030/viewer/2022032702/56649cc15503460f94988595/html5/thumbnails/1.jpg)
Sound Sensation LabSPARK Saturdays
Hui Jun Tay & Ameya Kamat
![Page 2: Sound Sensation Lab SPARK Saturdays Hui Jun Tay & Ameya Kamat.](https://reader030.fdocuments.in/reader030/viewer/2022032702/56649cc15503460f94988595/html5/thumbnails/2.jpg)
SoundSounds are vibrations that propagate in airThink ripples in a pond, waves on a beach
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Sine Waves
![Page 4: Sound Sensation Lab SPARK Saturdays Hui Jun Tay & Ameya Kamat.](https://reader030.fdocuments.in/reader030/viewer/2022032702/56649cc15503460f94988595/html5/thumbnails/4.jpg)
AmplitudeMeasured in Decibels (dB)Loud noises have “bigger” vibrations
◦Hitting a ruler hard vs hitting it softly
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MicrophoneLoud sounds -> higher amplitude
variation
Louder sound hits the microphone -> higher voltage -> stronger signal
Changes in pressure (due to vibration) correspond to changes in voltage
![Page 6: Sound Sensation Lab SPARK Saturdays Hui Jun Tay & Ameya Kamat.](https://reader030.fdocuments.in/reader030/viewer/2022032702/56649cc15503460f94988595/html5/thumbnails/6.jpg)
SpeakersBasically work in reverse
◦Based on voltage, generate vibrations
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Sound of a Sine Wave“Pure” tone
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FrequencyMeasured in Hertz (Hz)How fast it vibrates (cycles per second)
◦Faster -> Higher Pitched◦Slower -> Lower Pitched
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Fun Facts
Humans: 20 – 20,000 Hz◦Younger people can hear higher
frequencies!Dogs 20 – 45,000 Hz
‘Mosquito Frequency’ ringtone
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Demo/ExporationTry different frequencies.Don’t hurt yourself!
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Checkpoint #1
What we’ve learnt so far…◦Sound as a Sine Wave◦Amplitude◦Frequency
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Actual SoundDo Voices and Music sound like that?
◦No!
Not one ‘pure’ sine wave, but multiple overlapping sine waves
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Overlap
+
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Frequency DomainThe different frequencies of a given sound
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Different Instruments
Audacity!◦Piano◦Trumpet◦Violin◦Bass
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Checkpoint #2
What we’ve learnt so far…◦Sound as a Sine Wave◦Amplitude◦Frequency◦Multiple Sine Waves◦Frequency Domain
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Filtering
“Cut off” frequencies we do not want
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Before and After
FILTER!
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Audacity Demo
Filtering out an instrument
Canon in D◦Violin, Cello, Guitar, Bass
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Audacity Demo – Low Pass
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Audacity Demo – Low Pass
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Canon in D
Four Instruments (Violin, Cello, Guitar, Bass)
Try to get ◦1) only the bass◦2) only the violin
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Checkpoint #3
What we’ve learnt so far…◦Sound as a Sine Wave◦Amplitude◦Frequency◦Multiple Sine Waves◦Frequency Domain◦Filtering
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Messing Around
Record your voice on AudacityApply filters, effects, anything you
likeHave fun!