ISO/IEC 23003-1:2007 信息技术 MPEG音频技术 第1部分：MPEG环绕立体声

标准编号：ISO/IEC 23003-1:2007

中文名称：信息技术 MPEG音频技术 第1部分：MPEG环绕立体声

英文名称：Information technology — MPEG audio technologies — Part 1: MPEG Surround

发布日期：2007-02

标准范围

ISO/IEC 23003-1:20 07（MPEG环绕声）是用于多声道音频压缩的高效技术。MPEG环绕声不是执行各个音频输入声道的离散编码，而是将多声道音频信号的空间图像捕获到用于从发送的下混信号合成高质量多声道表示的紧凑参数集合中。MPEG环绕声扩展了用于编码两个或更多个声道的传统技术，其在压缩效率和用户益处方面提供了几个显著的优点。首先，它允许以比特率传输多声道音频，迄今为止，比特率已用于传输单声道音频。其次，通过其底层结构，多声道音频信号以向后兼容的方式传输，即。e.该技术可用于升级立体声或单声道音频内容（无线电频道、互联网流、音乐下载等）的现有分发基础设施。）以提供多声道音频，同时保持与现有接收器的完全兼容性。MPEG环绕声的关键特征是:与底层压缩方案无关。MPEG环绕声可以灵活地将几乎任何音频压缩方案（包括PCM）扩展到多声道。立体声耳机上的高质量双耳（虚拟环绕）表现。此外，可以在MPEG环绕编码器中启用双耳处理，支持传统立体声播放设备上的虚拟环绕。MPEG环绕声生成的立体声下混音可以被渲染为与传统矩阵环绕声系统兼容。此外，MPEG环绕声提供了一种“增强矩阵模式”，比竞争的环绕声技术实现了更高的质量。对于典型的MPEG环绕解码操作模式，低功率解码变体是可用的。除了典型的立体声到5.1声道操作，MPEG环绕声可以扩展到其输入和输出声道的数量。此外，在解码时，信道配置可以与再现能力相匹配。MPEG环绕声的比特率开销是灵活的，允许从低比特率应用如因特网无线电到高质量应用如数字电视广播的可伸缩性。

ISO/IEC 23003-1:2007 (MPEG Surround) is efficient technology for multi-channel audio compression. Rather than performing a discrete coding of the individual audio input channels, MPEG Surround captures the spatial image of a multi-channel audio signal into a compact set of parameters that are used to synthesize a high quality multi-channel representation from a transmitted downmix signal. MPEG Surround extends traditional techniques for coding of two or more channels in a way that provides several significant advantages in terms of compression efficiency and user benefits. Firstly, it allows the transmission of multi-channel audio at bitrates, which so far have been used for the transmission of monophonic audio. Secondly, by its underlying structure, the multi-channel audio signal is transmitted in a backward compatible way, i.e. the technology can be used to upgrade existing distribution infrastructures for stereo or mono audio content (radio channels, Internet streaming, music downloads, etc.) towards the delivery of multi-channel audio while retaining full compatibility with existing receivers.

Key features of MPEG Surround are:

• Agnostic to the underlying compression scheme. MPEG Surround is flexible to extend virtually any audio compression scheme including PCM, towards multi-channel.
• High quality binaural (virtual surround) representation on stereo headphones. Additionally, the binaural processing can be enabled in the MPEG Surround encoder, supporting virtual surround on legacy stereo playback devices.
• The MPEG Surround generated stereo downmix can be rendered compatible to legacy matrix surround systems. In addition, MPEG Surround offers an "Enhanced Matrix Mode" which achieves a higher quality than competing surround sound technologies.
• For the typical MPEG Surround decoding operation modes, a low power decoding variant is available.
• Next to typical stereo to 5.1 channel operation, MPEG Surround is scalable to its number of input and output channels. Furthermore, upon decoding, the channel configuration can be matched to the reproduction capabilities.
• The bit rate overhead for MPEG Surround is flexible, allowing scalability from low bitrate applications such as Internet radio to high quality applications such as digital TV broadcasting.

标准预览图