| English | eng-000 |
| voice-frequency | |
| 普通话 | cmn-000 | 声频 |
| 普通话 | cmn-000 | 音频 |
| English | eng-000 | acoustic frequency |
| English | eng-000 | acoustical frequency |
| English | eng-000 | audio frequency |
| English | eng-000 | note frequency |
| English | eng-000 | tone frequency |
| русский | rus-000 | тональная телеграфия |