Absolute Threshold of Hearing
From Hydrogenaudio Knowledgebase
The Absolute Threshold of Hearing (ATH) is the volume level at which one can detect a particular sound 50% of the time. If one has a low absolute threshold, it means that he is able to detect small amounts of stimulation, and thus is more sensitive. If one has a high absolute threshold, then he requires more stimulation and thus is less sensitive.
The following are curves of the ATH for several age groups over frequency. Zwicker approximated these curves from experiments on a number of subjects:
ATH graph for different age-groups
The ATH is the simplest property of human hearing to exploit when designing a psychoacoustics model.
