Observing Beyond our Senses: Inquiry Drives Technology Lesson 4 – Signal & Noise.

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Observing Beyond our Senses: Inquiry Drives Technology Lesson 4 – Signal & Noise

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Transcript of Observing Beyond our Senses: Inquiry Drives Technology Lesson 4 – Signal & Noise.

Page 1: Observing Beyond our Senses: Inquiry Drives Technology Lesson 4 – Signal & Noise.

Observing Beyond our Senses: Inquiry Drives Technology

Lesson 4 – Signal & Noise

Page 2: Observing Beyond our Senses: Inquiry Drives Technology Lesson 4 – Signal & Noise.

Teacher Helping a Student What’s the Signal?What’s the Noise?

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Commodities Traders in Chicago Signal?Is sound the only noise?

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Urban Astronomer Viewing the StarsSignal?Noise?

Page 5: Observing Beyond our Senses: Inquiry Drives Technology Lesson 4 – Signal & Noise.

Operational Definitions

• What is signal?

• What is noise?

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How are these examples of noise similar to the previous examples?

How are they different?

Webcam Analog TV

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Can Noise Exist in the Absence

of Signal?

How can we refine our operational definition of noise?

Page 8: Observing Beyond our Senses: Inquiry Drives Technology Lesson 4 – Signal & Noise.

Signal?Noise?

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How do calculations to obtain velocity

affect the noise?

Zoom in on a motionless Cart . . .

How does this noise compare to the last example?

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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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