Signals and Sounds
This demo illustrates how signals with different frequency components look and sound.
Click on the signal to hear the tone.
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This is a pure tone arising from a sinusoid. Synthetic music can be made by concatenating sine waves of different frequencies. More on this. |
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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. |
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This adds a harmonic to the tone. It should sound richer. |
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This adds a lot of harmonics of equal strength. You should hear the additional high frequency content when compared to the previous example. |
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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. |
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This has a lot of frequency content, sounds more like a buzzer! |
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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. |
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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.