电话拨号有两种,脉冲和音频,所谓音频也称双音多频(DTMF)信号的拨号方式,双音多频既是电话拨号时每按一个键,有两个音频频率叠加成一个双音频信号,十二个按键由八个音频频率区分(见双音多频图册)。
双音多频信号的发送与接收: (1) DTFM信号 双音多频(Dual Tone Multiple Frequency )此 种电话机在掀动某一号码时发出相应的双音多频 信号,使拨号速度比脉冲拨号信号增加十倍左右 (2)键盘的组成 键盘是DTMF发生...
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双音多频功能 DTMF
双音多频信号 DTMF ; DTMF Dual-Tone Multifrequency Signaling ; Dual Tone Multi-Frequency ; Tone Multifrequency Signaling
双音多频序列 DTMF ; dual-tone multi frequency
双音多频按键话机 DTMF Phone Set
双音多频制 dual-tone multifrequency system ; DTMF Dual-Tone Multifrequency System
双音多频应用 DTMF
双音多频接收机 dual tone multifrequency receiver
发送双音多频 DTMF
双音多频包 DTMF Package
This model offers SIP Specific Event Notification to transmit DTMF, and uses SUBSCRIBE and NOTIFY to realize the control to IP phone.
该模型利用事件通告机制来传送双音多频信号,通过SUBSCRIBE和NOTIFY两个消息来实现交换机对SIP终端的完全控制。
参考来源 - 基于事件通告的会话发起协议网络模型的研究·2,447,543篇论文数据,部分数据来源于NoteExpress
给出了双音多频发送电路的分立元件实现方法。
The realization of the DTMF circuit using discrete components was presented in this paper.
本文介绍一种DTMF(双音多频)通信方式的远程测控系统。
This paper presents a detection and control system in which the DTMF method is used to realize data communication.
该系统由以单片机at89c51和双音多频mt8870解码芯片为核心的系统硬件及软件组成。
It is composed of software and hardware, with single chip AT89C51 and DTMF decoding chip MT8870 as its cores.
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