基于MSP430单片机的DTMF信号识别系统设计  

Design of DTMF Signal Recognition System Based on MSP430 MCU

作　　者：杨迪一 董军堂[1] YANG Diyi;DONG Juntang(School of Physics and Electronic Information,Yan’an University,Yan’an 716000,China)

机构地区：[1]延安大学物理与电子信息学院,陕西延安716000

出　　处：《延安大学学报（自然科学版）》2022年第3期61-65,共5页Journal of Yan'an University：Natural Science Edition

基　　金：陕西省能源大数据智能处理省市共建重点实验室研究基金项目(IPBED11,IPBED16);陕西省自然科学基金项目(2021JQ-635);延安大学青年科研计划项目(YDQ2020-08);延安大学产学研合作培育项目(CXY202105);延安大学继续教育教学改革研究项目(YDYJ2020-21)。

摘　　要：DTMF信号的识别通常采用专用芯片来完成,存在占用PCB面积大、成本高、功耗大等问题,为了解决这些问题,提出了利用嵌入式控制器MSP430实现对DTMF信号的识别方法和系统设计。音频DTMF信号经过调理电路后输入MSP430单片机内部的ADC,在定时器控制下进行采样,得到DTMF信号的数字量。采用Goertzel算法分别计算出8个频点的幅值,根据最大功率点的行频和列频,识别出按键信息。通过设计和制作相关电路,借助MATLAB仿真结果调整参数,设计了利用Goertzel算法的DTMF信号识别程序系统。实验结果显示系统达到了技术指标的要求,实现了MSP430单片机对DTMF信号的采集与识别。该系统具有结构简单、成本低、功耗小、不额外占用PCB面积等优势,具有一定的实用价值。The identification of DTMF signals is usually completed by special chips,which have problems such as large PCB area occupation,high cost,and high power consumption.Therefore,employing embedded controller MSP430 is proposed to design recognition methods and system for DTMF signals.The audio DTMF signal is input to the ADC inside the MSP430 microcontroller after the conditioning circuit,and is sampled under the control of the timer to obtain the digital quantity of the DTMF signal.The Goertzel algorithm is used to calculate the amplitudes of 8 frequency points respectively,and the key information is identified according to the row frequency and column frequency of the maximum power point.By designing and making related circuits and adjusting parameters with the help of MATLAB simulation results,a DTMF signal recognition program system using Goertzel algorithm is designed.The experimental results show that the system meets the requirements of technical indicators,and realizes the acquisition and identification of DTMF signals by MSP430 microcontroller.The system has the advantages of simple structure,low cost,low power consumption,and does not occupy additional PCB area,demonstrating.

关 键 词：DTMF MSP430G2553 信号检测 GOERTZEL算法 单片机 

分 类 号：TN911.23[电子电信—通信与信息系统]