摘要
世界数字广播(Digital Radio Mondiale,DRM)是数字调幅广播的国际标准,其信息媒介为音频信号。介绍DRM系统中广泛采用的MPEG-4高级音频编解码(Advanced Audio Coding,AAC)标准及相关算法,包括心理声学模型、滤波、量化、无噪声编码及时域噪声整形的实现原理,分析音频解码的基本流程。在工程应用阶段,为了优化硬件接收器的设计方法,利用C++语言编写接收器软件,用于模拟硬件设备的功能。经测试,该软件工具能够有效解码DRM音频信息。
Digital Radio Mondiale(DRM)is an international standard for digital amplitude modulation broadcasting in which the information medium is audio signals.This paper introduces MPEG-4 Advanced Audio Coding(AAC)standard and related algorithms widely used in DRM system,including the implementation principle of psychoacoustic model,filtering,quantization,noiseless coding and time domain noise shaping,and analyzes the basic flow of audio decoding.In the engineering application stage,in order to optimize the design method of the hardware receiver,the receiver software is written in C++language to simulate the function of the hardware device.After testing,the software tool can decode DRM audio information effectively.
作者
张乐萌
ZHANG Lemeng(Qujing 691 Station of Yunnan Radio and Television Bureau,Qujing 655000,China)
出处
《电视技术》
2024年第5期31-34,共4页
Video Engineering
