A complex tone can be created by starting with a pure tone, called the fundamental frequency, and adding frequencies that are multiples of this first frequency.
The average of hearing threshold levels at a group of predetermined frequencies, commonly 500, 1000, 2000, and 4000 Hz, is referred to as a pure tone average (PTA). This number provides a quick picture of a person's hearing capacity in each ear.
Starting with a pure tone at the desired pitch, such as 220 Hz, we can then generate a complicated tone. The note is then given harmonic additions to alter its tonal quality. These additions can make the sound "richer," "brighter," or "more mellow," or any other attributes we associate with musical tones.
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