White noise

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/white-noise

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the signal processing definition?A random signal with a constant power spectral density across all frequencies
2. What is the theoretical construct?An infinite-bandwidth signal with uniform intensity at every frequency
3. Why do people use white noise for sleep?White noise masks other sounds, giving a steady background that helps people concentrate or fall asleep. It covers up disruptive noises that might wake someone up.
4. How is white noise used in phones and the internet?Engineers use white noise to model the random noise in communication channels. This helps them design stronger signals that can still be understood over noisy connections.

Power Spectral Density (PSD): A function that describes how the power of a signal or time series is distributed over frequency.
Serially Uncorrelated: A sequence where each element is statistically independent of all preceding elements.
Additive White Gaussian Noise (AWGN): A common model for noise in communication systems, characterized by a flat spectrum and Gaussian distribution.