Technical term used in computing, audio engineering, and acoustics to refer to frequencies within the range of human hearing (roughly 20 Hz to 20 kHz).
This circuit operates in the audio frequency range.
可聴周波数以上の音を超音波と呼ぶ。
Sounds above the audio frequency range are called ultrasonic waves.
Compound of 可聴 (kachō, 'audible') and 周波数 (shūhasū, 'frequency'). The term is a direct technical translation of the English 'audio frequency'.