| 全球数字广播系统音频编码器的软件实现 |
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| 引用本文： | 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 |
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| 作者姓名： | 卢尧 安建平 吕品 |
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| 作者单位： | 北京理工大学,电子工程系,北京,100081;中国科学院,软件研究所GSL实验室,北京,10080 |
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| 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)。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。
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| 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 |
| 文章编号： | 1002-8331（2007）12-0100-04 |
| 修稿时间： | 2006-05-01 |
Software implementation of audio encoder applied in DRM system |
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| LU Yao,AN Jian-ping,LV Pin. Software implementation of audio encoder applied in DRM system[J]. Computer Engineering and Applications, 2007, 43(12): 100-103 |
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| Authors: | LU Yao AN Jian-ping LV Pin |
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| Affiliation: | 1.Electronic Engineering Department, BIT, Beijing 100081, China ;2.GSL,Institute of Software, Chinese Academy of Science, Beijing 100080, China |
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| Abstract: | DRM(Digital Radio Mondiale) is a digital audio broadcasting system for the frequency below 30 MHz.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. |
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| Keywords: | digital broadcasting system advanced audio coding Modified Discrete Cosine Transformation(MDCT) audio encoder |
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