| 1. | Dual - tone multifrequency system dtmf
双音多频制 |
| 2. | Dual - tone multifrequency system
双音多频制 |
| 3. | Dtmf : dual tone multi - frequency
双音多频 |
| 4. | Dual tone multi - frequency dtmf
双音多频 |
| 5. | Dtmf dual tone multifrequency
双音多频 |
| 6. | Dual - tone multi - frequency
双音多频 |
| 7. | Dual tone multifrequency
双音多频 |
| 8. | A method used by the telephone system to communicate the keys pressed when dialling
双音多频：电话系统拨号时通过按键按下的事件来通讯。 |
| 9. | In chapter , dtmf signal ' s generation and detection is discussed and implemented by ti c54x assemble
第三章研究了数字双音多频信号的产生和检测技术，并使用tic54x汇编语音进行实现。 |
| 10. | Telephone circuit produce dtmf signal , receive ring signal and perform speech function . dtmf receiver lets it becomes binary code for mcu to read . analog circuit process speech signals between phone and gsm modem
固话电路提供产生的双音多频信号及振铃和通话功能，双音多频收号电路将dtmf信号变成二进制码，便于mcu的识别和处理。 |
