| |||
複頻式訊號 (The signaling system used in telephones with touchtone keypads, in which each digit is associated with two specific frequencies) | |||
| |||
双音调多声频; 双音复频 | |||
| |||
双音多频 | |||
English thesaurus | |||
| |||
Dual Tone Multiple-Frequency (The signaling system used in telephones with touchtone keypads, in which each digit is associated with two specific frequencies) | |||
| |||
DTMF |