The dielectric coefficients of hematite ores measured in audio frequency range are always large in value, and show that hematite is a special dielectric.

在声频范围内测得赤铁矿介电系数值较大，说明它是一种特殊的电介质。

youdao

The handset incorporates audio technology that optimizes the frequency range based on a user's age, making it easier to hear the voice of the person on the other end of the call.

ENGADGET: Fujitsu, Orange partner on senior-friendly Stylistic S01 smartphone