|Sine (1000 Hz, -3 dBFS)|
The most fundamental sound is the sine wave, characterized by a single frequency without any harmonics. A sine wave can be easily recognized by ear, as it sounds very pure, almost like a whistle.
In 1822, French mathematician Joseph Fourier discovered that any waveform could be broken up as a combination of sine waves with different amplitude and frequencies. The discipline of reducing a complex waveform to a combination of sine waves is called Fourier analysis, and is fundamental to audio processing!
As sine waves are made up by a single frequency, they are best suited to test audio systems at a given frequency.
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