基于增强型Goertzel滤波的DTMF算法研究及检测系统实现
发布时间：2019-02-17 08:41
【摘要】：双音多频(DTMF)技术在频段上的复用可以增加水声通信技术中单位时间内传递的信息量,在通信效率上相比于单音频通信技术有明显提升。所以双音多频技术在水声通信中的进步能够为海洋领域的发展提供坚实的基础,具有较好的研究价值和应用前景。本文通过研究双音多频通信中相关目标频点与其频点因数变换之间的数值关系,以传统Goertzel算法的滤波原理为基础,深入分析数字滤波中导致频谱偏移、失真的窗形截短和频谱泄露问题,对Goertzel滤波算法进行有效功率谱频点的校正和频谱泄露的线性补偿。设计并实现一种基于双音多频增强型Goertzel滤波算法的动态信息检测系统。本论文的主要工作包括：1)提出一种频谱校正的增强型Goertzel滤波算法。该算法以传统Goertzel算法为基础,本文分析非整数频点因数在Goertzel算法递归迭代中的可行性,通过对目标频点的校正对功率谱计算过程进行优化,提高对双音多频信号流软件解码过程中目标频点功率谱幅值的可识别度,并通过软件仿真和硬件系统实验对此进行了验证。2)提出一种频谱泄露补偿型Goertzel滤波算法。该算法在频谱校正的增强型Goertzel滤波算法的基础上引入与目标频点对应的功率谱失真问题,在分析数字采样和窗形截短对双音多频信号频谱泄露的叠加影响后,提出分级泄露频点的的线性补偿算法,对频谱校正的增强型Goertzel滤波算法在功率谱泄露上进行修正,通过软件仿真和硬件系统实验证实目标频点功率谱幅值的可识别度在双音多频信号解码过程中的提高。3)设计并实现一种基于双音多频增强型Goertzel滤波算法的动态信息检测系统。在本系统的设计中提出由甲板单元和水下主机单元构成的主机部分以及由信标分机和管道内部检测单元构成的分机部分的设计结构,明确各部分详细的设计方案并进行实现。通过实验对比可以得出改进的Goertzel算法检测效果由于传统算法以及硬件解调方案。
[Abstract]:The multiplexing of dual-tone and multi-frequency (DTMF) technology in frequency band can increase the amount of information transferred in the unit time of underwater acoustic communication technology, and the communication efficiency is obviously improved compared with that of single audio communication technology. Therefore, the progress of dual-tone multi-frequency technology in underwater acoustic communication can provide a solid foundation for the development of ocean, and has good research value and application prospect. In this paper, we study the numerical relationship between the frequency points of the target and the frequency factor transformation in the dual-tone multi-frequency communication. Based on the filtering principle of the traditional Goertzel algorithm, we deeply analyze the spectrum offset caused by the digital filtering. The problem of window truncation and spectrum leakage of distortion is used to correct the effective power spectrum frequency points and compensate the spectrum leakage linearly for the Goertzel filtering algorithm. A dynamic information detection system based on dual-tone multi-frequency enhanced Goertzel filtering algorithm is designed and implemented. The main work of this thesis is as follows: 1) an enhanced Goertzel filtering algorithm for spectrum correction is proposed. Based on the traditional Goertzel algorithm, this paper analyzes the feasibility of the non-integer frequency factor in the recursive iteration of the Goertzel algorithm, and optimizes the power spectrum calculation process by correcting the target frequency points. The recognition degree of power spectrum amplitude of target frequency point in the process of software decoding of dual-tone multi-frequency signal stream is improved, and it is verified by software simulation and hardware system experiment. 2) A spectrum leakage compensated Goertzel filter algorithm is proposed. Based on the enhanced Goertzel filtering algorithm for spectrum correction, the power spectrum distortion problem corresponding to the target frequency point is introduced. After analyzing the superposition effect of digital sampling and window truncation on the spectrum leakage of dual-tone multi-frequency signals, A linear compensation algorithm for hierarchical leakage frequency points is proposed. The enhanced Goertzel filtering algorithm for spectrum correction is modified on power spectrum leakage. Software simulation and hardware system experiments show that the recognizability of target power spectrum amplitude is improved in the decoding process of dual-tone multi-frequency signal. 3) Design and implementation of a dual-tone multi-frequency enhanced Goertzel filter algorithm State information detection system. In the design of the system, the design structure of the host part composed of the deck unit and the underwater main engine unit and the extension part composed of the beacon extension and the pipeline internal inspection unit is put forward, and the detailed design scheme of each part is made clear and realized. The experimental results show that the improved Goertzel algorithm is based on the traditional algorithm and the hardware demodulation scheme.
【学位授予单位】：北京工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.3
本文编号：2424978
[Abstract]:The multiplexing of dual-tone and multi-frequency (DTMF) technology in frequency band can increase the amount of information transferred in the unit time of underwater acoustic communication technology, and the communication efficiency is obviously improved compared with that of single audio communication technology. Therefore, the progress of dual-tone multi-frequency technology in underwater acoustic communication can provide a solid foundation for the development of ocean, and has good research value and application prospect. In this paper, we study the numerical relationship between the frequency points of the target and the frequency factor transformation in the dual-tone multi-frequency communication. Based on the filtering principle of the traditional Goertzel algorithm, we deeply analyze the spectrum offset caused by the digital filtering. The problem of window truncation and spectrum leakage of distortion is used to correct the effective power spectrum frequency points and compensate the spectrum leakage linearly for the Goertzel filtering algorithm. A dynamic information detection system based on dual-tone multi-frequency enhanced Goertzel filtering algorithm is designed and implemented. The main work of this thesis is as follows: 1) an enhanced Goertzel filtering algorithm for spectrum correction is proposed. Based on the traditional Goertzel algorithm, this paper analyzes the feasibility of the non-integer frequency factor in the recursive iteration of the Goertzel algorithm, and optimizes the power spectrum calculation process by correcting the target frequency points. The recognition degree of power spectrum amplitude of target frequency point in the process of software decoding of dual-tone multi-frequency signal stream is improved, and it is verified by software simulation and hardware system experiment. 2) A spectrum leakage compensated Goertzel filter algorithm is proposed. Based on the enhanced Goertzel filtering algorithm for spectrum correction, the power spectrum distortion problem corresponding to the target frequency point is introduced. After analyzing the superposition effect of digital sampling and window truncation on the spectrum leakage of dual-tone multi-frequency signals, A linear compensation algorithm for hierarchical leakage frequency points is proposed. The enhanced Goertzel filtering algorithm for spectrum correction is modified on power spectrum leakage. Software simulation and hardware system experiments show that the recognizability of target power spectrum amplitude is improved in the decoding process of dual-tone multi-frequency signal. 3) Design and implementation of a dual-tone multi-frequency enhanced Goertzel filter algorithm State information detection system. In the design of the system, the design structure of the host part composed of the deck unit and the underwater main engine unit and the extension part composed of the beacon extension and the pipeline internal inspection unit is put forward, and the detailed design scheme of each part is made clear and realized. The experimental results show that the improved Goertzel algorithm is based on the traditional algorithm and the hardware demodulation scheme.
【学位授予单位】：北京工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.3
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