全球数字广播系统音频编码器的软件实现

计算机工程与应用 ›› 2007, Vol. 43 ›› Issue (12): 100-103.

全球数字广播系统音频编码器的软件实现

卢尧安建平吕品

北京理工大学电子工程系通信教研室中国科学院软件研究所通用软件实验室

收稿日期:2006-05-12 修回日期:1900-01-01 出版日期:2007-04-20 发布日期:2007-04-20
通讯作者: 吕品

The Software Implementation of Audio Encoder Applied in DRM System Based On PC

Received:2006-05-12 Revised:1900-01-01 Online:2007-04-20 Published:2007-04-20

摘要/Abstract

摘要： 全球范围的数字广播系统DRM（Digital Radio Mondiale），是一种针对30MHz以下频段的数字声音广播系统。和传统广播系统相比，DRM数字广播系统在声音质量上是模拟调幅广播无法比拟的。这其中的关键之一在于DRM系统引入了新的信源编解码技术——MPEG-4标准的AAC（Advanced Audio Coding，先进音频编码）。本文在分析符合DRM标准的AAC音频编码器原理基础上，提出了一种改进的离散余弦变换算法，并在PC上实现了基于该算法的AAC音频编码器。实验表明，该软件编码器能够满足DRM系统实时性要求。

关键词: 数字广播系统, 先进音频编码, 改进离散余弦变换, 音频编码器

Abstract: DRM ( Digital Radio Mondiale) is a digital audio broadcasting system for the frequency below 30MHz. The voice quality in the DRM system is much higher than that in the analogue AM broadcasting system because new encoding and decoding technologies are used in the DRM. In DRM standard, AAC is the first choice for source coding. So the research of AAC encoder and decoder is the demanding task in DRM system. In this paper, a Modified Discrete Cosine Transformation algorithm is provided, based on the analysis of the principle of AAC encoder in accord with the DRM standard, and this algorithm is implemented based on PC. Experimentations indicate that this software encoder can satisfy the real-time requirement.

Key words: digital broadcasting system, advanced audio coding, MDCT, audio encoder

卢尧安建平吕品. 全球数字广播系统音频编码器的软件实现[J]. 计算机工程与应用, 2007, 43(12): 100-103.