ABSTRACT
Regardless of the ambient noise level, mobile phones always ring at a preset volume, causing inconvenience for users. This study aimed to find the appropriate ringtone volumes for different frequencies and for various noise levels. This study implemented the key concepts of signal detection theory to achieve the objective of this study. An experiment was conducted with 30 participants, using the forced choice tracking method. In the experiment, the signal was a pure tone and the noise was white noise. There were two factors: the ambient noise level (70 and 80dB) and the frequency of a signal (500, 1000, and 4000Hz). The results showed that the ringtone volume should be 10~15dB louder when the ambient noise level increases from 70dB to 80dB. In addition, the subjects were most sensitive to the pure tone with a frequency of 500Hz.
