双音多频DTMF技术在DSP系统的实现 小组成员 ： 郭亮 宁宪 李创 刘恒宇 刘明超 王卓 墨书铭 莫磊 2011-4-5 目录 双音多频DTMF技术在DSP系统的实现 ........................................... 1 abstract ............................................................................................ 3 双音多频 ....................................................................................... 4 DDTMF在VOIP中的解决方案 ....................................................... 4 Ou t of Band DTMF(RFC 2833) ........................................................ 5 1 、 DTMF信号的产生 ............................................................... 7 2 DTMF信号的检测 ...................................................................... 8 2.2 DTMF检测器流程 ................................................................. 8 3 性能分析 ................................................................................ 8 参考 .............................................................................................. 9 abstract ual tone multi-frequency signals (DTMF), telephone system, telephone and the switch signaling between a user, usually used to send the called number. In the use of dual tone multi-frequency signal before the telephone system using a series of intermittent pulses to transmit the called number, known as pulse dialing. Sent simultaneously to the two telephone switch frequency signal, sending key messages. A total of eight frequency audio signal is divided into 2 groups of 4, any two combinations can represent a total of 16 keys, each representing 0-9, #, *, etc. buttons. 双音多频 双音多频DTMF（Dual Tone Multi Frequency）信令，逐渐在全世界范围内使用在按键式电话机上，因其提供更高的拨号速率，迅速取代了传统转盘式电话机使用的拨号脉冲信令。近年来DTMF也应用在交互式控制中，诸如语言菜单、语言邮件、电话银行和ATM终端等。通过软...
