Nature of Sound
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| Frequency | show 🗑
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| show | 20-20,000 Hz, if enough amplitude
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| show | 220 Hz
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| show | cycles per second
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| amplitude | show 🗑
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| vibration is... | show 🗑
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| show | frequency and amplitude
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| What happens in your ears when you change altitude driving up a canyon? | show 🗑
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| How does your voice make sound? | show 🗑
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| show | vary in a regular fashion
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| show | mechanism called an edge (creates an edgetone)
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| show | blow harder to speed up the air flow
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| How does an edge tone work? | show 🗑
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| show | A flexible, thin, springy reed at one end of a tube vibrates. The reed opens and closes like vocal folds. Finger holes change length of the tube. Reed vibrates at a speed that matches tube length.
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| show | Blow into them with pursed lips -> lips vibrate at one end of tube.
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| What are partials? | show 🗑
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| show | Different tube lengths result in different lip speeds. Any tube will only resonate at certain frequencies. Brass instruments need additional tube lengths for different sets of partials to be played.
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| show | Pressing valves re-routes air to different length tube paths
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| show | Strings are coupled to a resonating box, and are VIBRATED by plucking or bowing. Change string length to change pitch (long=low, short=high)
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