H1 - PURE TONE IN THE FREQUENCY DOMAIN

For the teacher

Explore a pure tone in the frequency domain.

A pure tone is a sinusoidal sound with a well defined frequency f.

Clicking the link on the left side you will listen to a pure tone.

Now we want you to explore this sound in the frequency domain. To carry out this activity you will need a Spectrum Analyzer. We suggest you to install,

• Advanced Spectrum Analyzer PRO (on Android devices);
• SpectrumView Free (on Apple devices).

The spectrum analyzer will 'listen' to the sound you are playing and will draw a plot (Intensity vs Frequency) showing all the frequencies detected in the sound. We will call this plot, frequency plot or spectrum. For example, if a frequency f1 is present, you will surely see a point like the one in the plot on the left. The intensity I1 will be proportional to the volume of the tone with frequency f1.

If you are using the Android App, remember to uncheck the Logarithmic Scale in Settings.

To begin your investigation on pure tones fill the following form.

To use the Form in your class and collect privately your results, make a copy of the Google Form on your computer, then submit it, as an owner, to your students.