The phon is a unit of loudness level for pure tones. Its purpose is to compensate for the effect of frequency on the perceived loudness of tones.
例句与用法
1.
Smile whenever you pick up the phon , for the caller will be able to notice it 无论什么时候打电话，拿起话筒的时候请微笑，因为对方能感觉到！
2.
The sound level produced from your booth shall be limited to no more than 80 phons , as measured at a point 2 meters away from the border line of the booth 自己展间的产生音量规定值为：从离开展间边界线2 m的地方进行测量，测定值在80phon以下。
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