The first set of examples consists of sine wave tones. A sine wave is the simplest possible audio signal. Every sound that you hear can be considered as consisting of a collection of sine waves of different frequencies, amplitudes and phase relationships.

In audio, we commonly use a 1 kHz (1 kilohertz = 1000 Hz) tone as a reference because it is subjectively halfway in the audio frequency band:

The lowest frequency that we normally consider to be in the audio range is 20 Hz.

You probably will not be able to hear a 20 Hz tone, not unless you have loudspeakers with an exceptionally good low frequency response. If there is distortion in your system, you may be able to hear frequencies that are multiples of 20 Hz, but these are generated by the distortion. They are not present in the file.

The upper limit of the audio range is normally considered to be 20 kHz. However, few people can hear frequencies that high.

Here are a few high-frequency tones that will allow you to test the upper limit of your hearing. You should adjust the level so that the 1 kHz file is comfortable to listen to.

If you can hear all of these tones, well done! It is likely however that the upper frequency limit of your hearing is less than this. Now you know roughly where your limit lies. Expect it to get lower as you get older.

Download the audio files...