广播电视信号的频谱识别的实验研究

发布时间：2018-12-11 05:57

【摘要】：正确鉴别广播电视的信号成分对于监测广播电视节目播出质量具有重要作用。可以通过信号分析或者频谱分析的方法来鉴别广播电视的信号成分。然而,随着数字通信技术和互联网的迅速发展,广播电视信号的频谱变得越来越复杂,如何快速分析电视信号已成为实现广播电视信号分析的最主要挑战。广播电视信号不仅仅是一种单一的信号,它是多种信号(比如FM、数字信号、模拟信号等等)的混杂体。传统的信号分析主要是对信号的频谱进行分析(把复杂波形经过傅里叶变换分解为若干单一的谐波分量来研究,以获得信号的频率结构以及各谐波和相位信息)。传统的频谱分析需要较长的计算时间,不能满足如今快节奏发展的社会需求,必须寻求更快的频谱区分方法来准确分辨信号成分。本文在分析电视信号过程中以解决上述问题为重点,并完善其他方面的性能,主要工作如下：(1)采用TCP端口通讯方案从频谱仪上获取频谱数据；设计频谱仪通信程序来控制频谱仪从而使得对频谱仪的控制不再受地域限制,可远距离进行频谱仪控制功能,加强了便利性；(2)采用两种获取频谱数据的方式(程序获取和直接操作频谱仪获取),保证了频谱数据的准确性；(3)算法采用Linux下C语言的实现方法,使得频谱分析过程有很强大的可移植性,不再局限于系统和平台的不同；(4)研究频谱分析的一般分析法,并将一般分析法与电视信号的理论知识结合,验证了算法的正确性；(5)设计的频谱仪通信程序和频谱分析程序的整个过程使得分析整段频谱并取得结果的时间不超过5秒；(6)综合上述设计方案,选择德力频谱仪为附件,完成频谱分析算法程序和频谱仪通信程序软件的设计,对所设计的方案进行了实现和验证。本文设计的频谱仪分析算法具备良好的可移植性和操作性,可进行远距离控制和分析频谱,从而使得频谱分析不再受距离和系统的限制,可以广泛的应用在相关的广播电视信号的嵌入式软件系统中。
[Abstract]:It is important to correctly identify the signal components of radio and television to monitor the broadcast quality of radio and television programs. Radio and television signal components can be identified by signal analysis or spectrum analysis. However, with the rapid development of digital communication technology and Internet, the spectrum of radio and television signals becomes more and more complex. How to analyze television signals quickly has become the main challenge to realize radio and television signal analysis. Radio and television signal is not only a single signal, it is a hybrid of many signals (such as FM, digital signal, analog signal, etc.). The traditional signal analysis is mainly to analyze the frequency spectrum of the signal (decomposing the complex waveform into several single harmonic components by Fourier transform to obtain the frequency structure of the signal and the information of each harmonic and phase). The traditional spectrum analysis needs longer computing time, which can not meet the social demand of rapid development. Therefore, it is necessary to find a faster spectrum identification method to accurately distinguish the signal components. This paper focuses on solving the above problems and improving the performance of other aspects in the process of analyzing TV signal. The main work is as follows: (1) the spectral data are obtained from the spectrum instrument by TCP port communication scheme; The communication program is designed to control the spectrometer so that the control of the spectrometer is no longer limited by the region, and the control function of the spectrometer can be carried out over a long distance, which enhances the convenience. (2) the accuracy of spectrum data is ensured by two ways of obtaining spectrum data (program acquisition and direct operation spectrum data acquisition); (3) the algorithm uses C language under Linux, which makes the spectrum analysis process more portable and no longer limited to the difference of system and platform. (4) the general analysis method of spectrum analysis is studied, and the correctness of the algorithm is verified by combining the general analysis method with the theoretical knowledge of TV signal. (5) the whole process of the communication program and spectrum analysis program of the designed spectrometer makes the whole spectrum analysis and the result less than 5 seconds; (6) the program of spectrum analysis algorithm and the communication program of spectrum analyzer are designed, and the scheme is realized and verified. The spectrum analyzer analysis algorithm designed in this paper has good portability and maneuverability. It can be used for remote control and spectrum analysis, so that spectrum analysis is no longer restricted by distance and system. It can be widely used in the embedded software system of radio and television signals.
【学位授予单位】：南京大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN943

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