Signals and Sounds
This demo illustrates how signals with different frequency components look and sound.
Click on the signal to hear the tone.
|This is a pure tone arising from a sinusoid. Synthetic music can be made by concatenating sine waves of different frequencies. More on this.|
|This should sound the same as the pure sine wave since your ear would not pick up a DC bias. If it doesn't sound the same, your speaker is probably saturating causing the singal to clip.|
|This adds a harmonic to the tone. It should sound richer.|
|This adds a lot of harmonics of equal strength. You should hear the additional high frequency content when compared to the previous example.|
|This should have slightly lower frequency content than the previous example due to the decreasing strength of the higher harmonics. It sounds a little less shrill.|
|This has a lot of frequency content, sounds more like a buzzer!|
|This is the result of a high frequency sinusoid (usually called the carrier signal) multiplying a low frequency sinusoid. The high frequency singal is the tone that you hear. The low frequency signal modulates the amplitude of the tone, thereby affecting its loudness in a sinusoidal pattern.|
|This chirp signal is essentially a sinusoid with a frequency that is increasing over time. You can hear the increasein pitch.|
These figures and wav files were generated using soundex.m.