音频信号监测系统的设计与实现

发布时间：2018-06-09 01:13

本文选题：音频监测 + 音频采集　；参考：《电子科技大学》2014年硕士论文

【摘要】：随着广电技术的发展,广播电台处理音频信号的数量和规模不断增加,听众对广播音频信号的质量和性能也提出了更高的要求,并且广电总局规定广播电台必须对音频信号进行实时的监测与分析,如果仅仅依靠人工监测远远不能满足音频信号监测的要求,基于这些考虑设计一种可以对音频信号进行实时监测分析和自动报警的监测系统对广播电台来说具有重要的意义。目前大部分的监测系统主要侧重于分布式的监测和常见参数的测量,不便于搭建监测系统并且监测参数未考虑人耳的主观听觉感受。本论文结合计算机通信技术、音频信号处理技术设计实现了一种音频信号监测系统,该监测系统引入了与人耳的主观听觉感受相关的响度监测,并且可实现音频信号的分布式与集中式监测。具体的工作内容和创新点包括以下几个方面:1.音频监测系统的总体方案设计。本文分析了常见的音频监测系统的设计方案,根据监测系统的监测音源、监测指标和应用场合的需求,采用了基于嵌入式平台的网络化音频信号监测系统的设计方案,该设计方案可以实现对音频信号的本机与远程的实时监测。2.音频监测系统的硬件电路设计。监测系统的硬件电路设计实现了音频采集模块、音频测量模块、系统主控模块和数据通信模块。音频采集模块利用专用芯片实现了专业级模拟音频信号和数字音频信号的数据采集和状态获取。数据通信模块采用集成MAC+PHY的物理层芯片扩展的方法将监测系统接入以太网。音频测量模块实现了基于DSP的音频指标参数的实时测量分析。系统主控模块实现了基于ARM的监测系统的功能模块实时控制。3.音频监测系统的软件程序设计。软件设计包括音频测量模块和系统主控模块相关的程序。音频测量模块实现音频信号的幅度、相位监测的基础上引入了与人的主观听觉感受相关的响度测量与分析。系统主控模块移植了嵌入式Linux操作系统,设计实现了音频采集模块和以太网通信电路的驱动程序,从而实现了音频信号参数和状态的网络化的监测。通过以上几部分设计,本系统可以对广播级的模拟音频信号和数字音频信号进行幅度、相位、响度和通道信息的实时测量分析,对各种错误音频状态进行报警,借助于监测终端可实现对音频信号的网络化监测。
[Abstract]:With the development of radio and television technology, the number and scale of audio signal processing by radio station is increasing, and the audience has put forward higher requirements for the quality and performance of broadcast audio signal. Moreover, the State Administration of Radio, Film and Television stipulates that radio stations must carry out real-time monitoring and analysis of audio signals. If manual monitoring alone is far from meeting the requirements of audio signal monitoring, Based on these considerations, it is of great significance to design a monitoring system that can monitor and analyze audio signals in real time and automatic alarm. At present, most of the monitoring systems mainly focus on distributed monitoring and the measurement of common parameters, which is not convenient to build the monitoring system and does not take into account the subjective auditory perception of human ears. In this paper, an audio signal monitoring system based on computer communication and audio signal processing is designed and implemented. The system introduces the loudness monitoring related to the subjective auditory perception of human ear. And it can realize the distributed and centralized monitoring of audio signal. Specific work content and innovation include the following aspects: 1. The overall design of audio monitoring system. This paper analyzes the design scheme of the common audio monitoring system. According to the monitoring sound source, monitoring index and the requirement of the application situation, the design scheme of the network audio signal monitoring system based on embedded platform is adopted. This design scheme can realize the real-time monitoring of audio signal both locally and remotely. Hardware circuit design of audio monitoring system. The hardware circuit design of the monitoring system includes audio acquisition module, audio measurement module, system main control module and data communication module. Audio acquisition module uses special chip to realize data acquisition and state acquisition of professional analog audio signal and digital audio signal. The data communication module connects the monitoring system to Ethernet by extending the physical layer chip of integrated MAC PHY. The audio measurement module realizes the real-time measurement and analysis of audio parameters based on DSP. The main control module of the system realizes the real-time control of the function module of the monitoring system based on arm. The software program design of audio monitoring system. Software design includes audio measurement module and system control module related programs. Based on the audio signal amplitude and phase monitoring, the audio measurement module introduces the loudness measurement and analysis related to human subjective auditory perception. The main control module of the system has transplanted embedded Linux operating system, designed and implemented the driver of audio acquisition module and Ethernet communication circuit, thus realized the network monitoring of audio signal parameters and status. Through the design of the above several parts, the system can measure and analyze the amplitude, phase, loudness and channel information of the analog audio signal and the digital audio signal in the broadcast level in real time, and alarm all kinds of false audio state. The network monitoring of audio signal can be realized by means of monitoring terminal.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN912.3

【参考文献】