observing beyond our senses: inquiry drives technology lesson 4 – signal & noise
Post on 12-Jan-2016
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Observing Beyond our Senses: Inquiry Drives Technology
Lesson 4 – Signal & Noise
Teacher Helping a Student What’s the Signal?What’s the Noise?
Commodities Traders in Chicago Signal?Is sound the only noise?
Urban Astronomer Viewing the StarsSignal?Noise?
Operational Definitions
• What is signal?
• What is noise?
How are these examples of noise similar to the previous examples?
How are they different?
Webcam Analog TV
Can Noise Exist in the Absence
of Signal?
How can we refine our operational definition of noise?
Signal?Noise?
How do calculations to obtain velocity
affect the noise?
Zoom in on a motionless Cart . . .
How does this noise compare to the last example?
Thermal Noise in ElectronicsRandom variations in current or voltage caused by the
random movement of the electrons carrying the current as they are jolted around by thermal energy.
Intended Signal
“Noisy” Electronic Device
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