IIR滤波器在DTMF信号检测与识别中的研究  

IIR filter research in DTMF signal detection and identification

作　　者：宋贵科 林晓焕[1] 麻焕成 贾丽云[1] Song Guike Lin Xiaohuan Ma Huancheng Jia Liyun(Electronics and Information College, Xi＇ an Polytechnic University, Xi＇ an 710048, China)

机构地区：[1]西安工程大学电子信息学院,西安710048

出　　处：《国外电子测量技术》2016年第12期88-92,共5页Foreign Electronic Measurement Technology

摘　　要：根据戈泽尔算法的推导DTF可以看作是一个二阶IIR滤波器的零状态响应。利用IIR滤波器与戈泽尔算法相结合的方法来提高双音多频信号检测的准确性和稳定性,以期解决信号检测对专用解码芯片的依赖。研究中使戈泽尔序列分别通过IIR滤波器和通用滤波器,对比二者的输出结果。结果表明,IIR滤波器与戈泽尔算法相结合有助于提高双音多频信号检测的准确性和稳定性。通过DTMF信号检测的MATLAB的仿真,证明了将带有IIR滤波器的戈泽尔算法移植到DSP硬件上能够解决对专用解码芯片的依赖。According to the derivation of the DTF Goertzel,algorithm can be regarded as a zero state response of the two order IIR filter.In order to solve the dependence on special decoding chip of signal detection,it can be combined the IIR filter with the Goertzel algorithm to improve the accuracy and stability of DTMF signal detection.Goertzel sequence respectively through by IIR filter and universal filter,then compare the two outputs.The results show that the combination of IIR filter and the Goertzel contribute to improve the accuracy and stability of DTMF signal detection.Through the simulation of Matlab,it can be concluded that the Goertzel with IIR filter is transplanted to the DSP hardware can solve the dependence on special decoder chip.

关 键 词：DTMF信号 戈泽尔 IIR滤波器 MATLAB 

分 类 号：TN912[电子电信—通信与信息系统]