信息技术.音视频对象编码.第3部分:音频

[中文适用范围]： ISO/IEC 14496-3（MPEG-4 音频）是一种新型音频标准，它集成了多种不同类型的音频编码：自然声音与合成声音、低比特率传输与高质量传输、语音与音乐、复杂音轨与简单音轨，以及传统内容与交互式及虚拟现实内容。通过标准化 individually sophisticated 的编码工具以及一种新颖、灵活的音频同步、混音和下载后制作框架，MPEG-4 音频标准的开发者为数字音频的交互式新世界创造了新技术。与 ISO/IEC 和其他组织之前创建的音频标准不同，MPEG-4 不针对单一应用（如实时电话或高质量音频压缩）。相反，MPEG-4 音频是一种适用于所有需要使用高级声音压缩、合成、操作或播放的应用的标准。随后的子部分规定了多个领域的最先进编码工具；然而，MPEG-4 音频不仅仅是其各部分的总和。随着此处描述的工具与 MPEG-4 标准的其余部分集成，实现了基于对象的音频编码、交互式演示、动态音轨和其他类型新媒体的令人兴奋的新可能性。由于使用一套工具来覆盖广泛应用的需求，互操作性是依赖 MPEG-4 音频标准的系统的自然特征。使用特定编码器的系统——例如使用 MPEG-4 语音编码工具集的实时语音通信系统——可以轻松地与其他系统共享数据和开发工具，即使是在不同领域，例如使用 MPEG-4 语音编码的语音邮件索引和检索系统。能够解码 MPEG-4 音频自然音频配置的多媒体终端，其音频功能涵盖了当今及未来可用的整个音频功能频谱。 [外文原描述]： ISO/IEC 14496-3:2009 integrates many different types of audio coding: natural sound with synthetic sound, low bitrate delivery with high-quality delivery and lossless coding, speech with music, complex soundtracks with simple ones, and traditional content with interactive and virtual-reality content. By standardizing individually sophisticated coding tools - as well as a novel, flexible framework for audio synchronization, mixing and downloaded post-production - ISO/IEC 14496-3:2009 creates adequate technology for a new, interactive world of digital audio. ISO/IEC 14496-3:2009, unlike previous audio standards created by ISO/IEC and other groups, does not target a single application such as real-time telephony or high-quality audio compression. Rather, it applies to every application requiring the use of advanced sound compression, synthesis, manipulation or playback. ISO/IEC 14496-3:2009 specifies state-of-the-art coding tools in several domains. As these tools are integrated with the other parts of ISO/IEC 14496, new possibilities for object-based audio coding, interactive presentation, dynamic soundtracks, and other sorts of new media are enabled. Since a single set of tools is used to cover the needs of a broad range of applications, interoperability is a natural feature of systems that build on ISO/IEC 14496-3:2009.