||This applet demonstrates beats, the result of combining two
waves of slightly different frequencies. Ideally, you will be
able to notice the slight difference between the two sounds so
that when you play the combined wave, you'll know that there
will be beats.
Here are step by step instructions for using the Beats
Next time, listen to each separate wave before listening to the
combined wave. Choose 440 Hz for Frequency #1 and 441 Hz for
Frequency #2. Click the "Hear It" button underneath
Frequency #1 and listen carefully to its pitch. Then, click the
"Hear It" button under Frequency #2 and try to detect
a difference from the first one. You'll find that it is nearly
impossible to hear a difference. Musicians face this problem all
the time when tuning their instruments to a reference pitch. By
listening to both sounds at the same time, the musician can tell
if the separate sounds are the same. If there is a beat, the
frequencies are not the same. If there is no beat, they are the
same and the musician's instrument is in tune.
- Choose a frequency level (between 437 and 443 Hz) for
- Choose a different level for Frequency #2.
- Click the "Hear It" button underneath the bottom
box by "Combined Wave" and listen for the beats.
You should hear a "wah-wah" sound -- that's the