| |||
| telephone frequency | |||
| voice frequency; speed frequency | |||
| voice-frequency | |||
| audio frequency; speech frequency | |||
|
Sprachfrequenz : 2 phrases in 2 subjects |
| Communications | 1 |
| Electronics | 1 |
| |||
| telephone frequency | |||
| voice frequency; speed frequency | |||
| voice-frequency | |||
| audio frequency; speech frequency | |||
|
Sprachfrequenz : 2 phrases in 2 subjects |
| Communications | 1 |
| Electronics | 1 |