audio frequency; audible frequency
Technical term used in acoustics, audio engineering, and electronics. AF is a common abbreviation.
The range of audio frequencies is generally considered to be from 20 Hz to 20 kHz.
This device amplifies audio frequencies.
可聴周波 is the native Japanese term for audio frequency, whereas ＡＦ is the English-derived abbreviation favored in audio engineering contexts.
Compound of 可聴 (kachō, 'audible') and 周波 (shūha, 'frequency'). The exact historical derivation is uncertain, but the term follows standard Sino-Japanese technical word formation.