新一代数字音频广播DAB+的音频处理方案分析与测试

The Analysis of Audio Processing in New Generation DAB+

随着数字多媒体广播的不断发展,数字音频广播DAB(Digital AudioBroadcasting)对其使用了近二十年的音频处理方案进行了升级,使用了更先进的MPEG-4 HE-AAC v2,升级后的广播系统称DAB+。与原DAB系统相比,DAB+在低码率下具有更高的效率。该文分析了HE-AACv2的基本原理,阐述了DAB+的特点与应用,最后对新一代接收机的硬件设计进行了实时测试与验证。

With the development of Digital Multimedia Broadcast,Digital Audio Broadcast （DAB） upgrades its core audio codec process which has been in application for nearly twenty years,introducing the more advanced HE-AAC v2.The upgraded system named DAB plus （DAB＋）.Compared with the previous DAB system,DAB＋ performed more efficiently at a lower bitrate. The paper gives an analysis of the basic audio decoding principle of HE-AAC v2,and describes the characteristic and application of the DAB＋ system, and at last shows the test and verification on the new hardware design of the new generation receiver.