frequency & amplitude introductory presentation. opening activity in clap on, clap off, we used...
TRANSCRIPT
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Frequency & AmplitudeIntroductory Presentation
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Opening Activity
In Clap On, Clap Off, we used the LEGO Sound Sensor to control when our robot moved and stopped.
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Opening Activity
Answer the Following:
1. What is sound?
2. How does it travel?
3. How do we measure sound?
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Review
Sound Sound is traveling energy which takes the form of regions of compressed air, soil, or whatever it’s traveling through.
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Review
We measure sound by some of its properties such as:
• Wavelength• Frequency• Amplitude
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Review: Wavelength
WavelengthIf someone were talking to you, Wavelength would be the distance between the regions of compacted air that their voice is creating.
Wavelength Wavelength Wavelength Wavelength
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Review: Frequency
FrequencyFrequency is a measure of how many of the compacted regions, or wavelengths, pass a certain point over an interval of time.
Point
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Review: Frequency
Frequency
The more wavelengths that pass in a set amount of time, the higher the frequency. The fewer wavelengths that pass in a set amount of time, the lower the frequency.
Low Frequency
High Frequency
1.5 wavelengths
3 wavelengths
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Review: Frequency
We perceive frequency as the pitch of a sound. Thus, frequency determines how high or low a specific sound is.
high notes = high frequency
low notes = low frequency
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Review: Frequency
So would a soprano sing high frequency notes or low frequency notes?
If you listened to a bass player would you be hearing high frequency sounds or low frequency sounds?
High frequency sounds
Low frequency sounds
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Review: Amplitude
AmplitudeAmplitude, commonly referred to as volume, is a measure of how hard the compacted regions of energy are pushing into what’s in front of them.
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Review: Amplitude
Amplitude
The harder they push they louder the sounds.
The softer they push, the quieter the sound.
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Review: GraphingAs a refresher on how to graph results, examine the chart below created with the included data.
Recorded Measurement
Trial 1 20
Trial 2 50
Trial 3 70
Trial 4 30
Data collected from experiment Data within a chart
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Reminder
One last thing!Make sure you have speakers connected to
your computer, otherwise your robot won’t have anything to listen for.
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Now you have the necessary knowledge to get started in the Frequency & Amplitude Activity.
Good Luck!