IRE (unit)

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/ire-unit

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 primary application?Measurement of composite video signal amplitudes
2. What is the etymology?Acronym for the Institute of Radio Engineers
3. What does IRE stand for and why is it used in TV signals?IRE stands for Institute of Radio Engineers. It gives a common scale to measure TV brightness and timing, so all TVs and broadcasts match.
4. How many IRE units does a normal TV signal use from black to white?In NTSC, the signal goes from about 7.5 IRE for black to 100 IRE for white, a total of 140 IRE peak‑to‑peak.

Composite Video Signal: A video signal that transmits luminance, chrominance, and synchronization information within a single channel.
Luminance: The component of a video signal that represents brightness information.
Chrominance: The component of a video signal that represents color information.
Blanking Interval: Periods within a video signal where no picture information is transmitted, used for retrace and synchronization.