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

Published byLucy Black Modified over 9 years ago

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Presentation on theme: "Observing Beyond our Senses: Inquiry Drives Technology Lesson 4 – Signal & Noise."— Presentation transcript:

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

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

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

4 Urban Astronomer Viewing the Stars Signal? Noise?

5 Operational Definitions What is signal? What is noise?

6 How are these examples of noise similar to the previous examples? How are they different? Webcam Analog TV

7 Can Noise Exist in the Absence of Signal? How can we refine our operational definition of noise?

8 Signal? Noise?

9 How do calculations to obtain velocity affect the noise? Zoom in on a motionless Cart... How does this noise compare to the last example?

10 Thermal Noise in Electronics Random 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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