Sound waves are compression waves in air that cannot be seen.
Physicists and sound engineers use several different types of graphs and charts to represent sound waves.
A waveform graph depicts pressure over time. A frequency spectrum breaks a complex wave down into its
component frequencies and shows their relative amplitudes. A spectrogram chart depicts both frequency
and loudness as a function of time. Sound waves can also be represented mathematically as a sum of sine waves using
Fourier’s theorem. In this lesson you will use an interactive simulation and a spectrogram tool
to explore sound waves
and their representations.
