OUTCOME
By the end of the lesson you will interpret and use a frequency response curve and use and explain the phon.
Loudness is subjective and not always related to intensity alone. Humans are more sensitive to some frequencies more than others. The Phon is an equivalence loudness measurement.
LEARNING TASKS
Explain
1. What is the range of human hearing?
2. What is loudness measured in?
3. Explain how the phon works
Explore and Elaborate
Prac: Frequency response test
Evaluate
Make sure you answer all the questions from the practical activity
Try
Revision Qs 23.12
Qs 26-28
Reading for next lesson p.23-25