文件名称:DTMF
- 所属分类:
- 单片机(51,AVR,MSP430等)
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- 上传时间:
- 2013-04-07
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- 2.58mb
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- 0次
- 提 供 者:
- 赵*
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DTMF(Dual Tone Multi Frequency)信号是音频电话的拨号信号。由美国AT&T贝尔实验室研制, 双音多频信号编码技术易于识别,抗干扰能力强,发号速度快,且比用modem进行远程传输的方法更为经济实用,因此这种拨号方法取代了传统的脉冲拨号。
电话中的双音多频信号有两种用途:一是用于双音多频信号的拨号,去控制交换机接通被叫的用户电话机;二是利用双音多频信号遥控电话机各种动作,如播放留言,语音信箱。这些都离不开DTMF信号的产生。
有详细的需求分析 功能说明 流程图及代码。
-DTMF (Dual Tone Multi Frequency) signal tone phone dialing signal. Developed by AT & T Bell Laboratories, dual-tone multi-frequency signal coding techniques are easy to identify, anti-interference ability and the number issued faster, more economical and practical than the modem for remote transmission, this dialing method to replace the traditional pulse dialing. Telephone dual tone multi-frequency signal has two purposes: one for dual tone multi-frequency signal a dial to control the switch is turned on the called subscriber telephone second is the use of dual tone multi-frequency signal remote telephone various action, such as playing a message, voice mail. These are inseparable from the generation of DTMF signals. Detailed needs analysis of flow chart and code.
电话中的双音多频信号有两种用途:一是用于双音多频信号的拨号,去控制交换机接通被叫的用户电话机;二是利用双音多频信号遥控电话机各种动作,如播放留言,语音信箱。这些都离不开DTMF信号的产生。
有详细的需求分析 功能说明 流程图及代码。
-DTMF (Dual Tone Multi Frequency) signal tone phone dialing signal. Developed by AT & T Bell Laboratories, dual-tone multi-frequency signal coding techniques are easy to identify, anti-interference ability and the number issued faster, more economical and practical than the modem for remote transmission, this dialing method to replace the traditional pulse dialing. Telephone dual tone multi-frequency signal has two purposes: one for dual tone multi-frequency signal a dial to control the switch is turned on the called subscriber telephone second is the use of dual tone multi-frequency signal remote telephone various action, such as playing a message, voice mail. These are inseparable from the generation of DTMF signals. Detailed needs analysis of flow chart and code.
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DTMF.docx