信息技术.音频-可视对象的编码.第23部分:音频符号的表示法

[中文适用范围]： 本国际标准定义了符号音乐表现技术。通过将符号音乐表现技术大写，可以得出首字母缩略词“SMR”。音乐的符号表现是一种逻辑结构，基于代表视听事件的符号元素、这些事件之间的关系以及与如何呈现和同步这些事件与其他媒体类型相关的方面。音乐的符号表现形式有很多种，包括圣歌、古典音乐、爵士乐和 20 世纪风格的不同风格的符号；打击乐符号；以及为儿童和视障读者简化的符号格式。MPEG-4 SMR 不会标准化其中一种或多种表现形式，而是一种可扩展语言，允许这些表现形式和许多其他表现形式共享音乐表现的共同底层结构。MPEG-4 SMR 允许将符号音乐元素与现有标准化 MPEG 技术可以表示和呈现的视听事件同步。 SMR 技术由不同的工具组成，其规范性描述在第 7 至 12 条中。 ― SMR 比特流：SMR 比特流的语法和语义。 ― 符号音乐扩展格式（SM-XF）：SMR 格式的语法和语义。 ― 符号音乐同步信息（SM-SI）：SMR 元素与其他视听元素之间的同步信息的语法和语义。 ― 符号音乐格式化语言（SM-FL）：应用于 SMR XML 格式进行渲染的渲染规则的语法和语义。 ― 配置文件的 SMR 对象类型：用于定义配置文件的 SMR 对象类型。 [外文原描述]： ISO/IEC 14496-23:2008 specifies Symbolic Music Representation (SMR). A symbolic representation of music is a logical structure based on: symbolic elements representing audiovisual events, the relationship between those events, and aspects related to how those events can be rendered (visually as music notation or audibly) and synchronized with other media types. The Symbolic Music Representation enables the development of new applications in several domains of entertainment, edutainment, infotainment, etc., from education and distance learning, to rehearsal and musical practice at home, from consumer electronics like set-top boxes for interactive TV to personal computers and mobiles systems. The SMR may be used to represent many kinds of symbolic music including different styles of Chant, Renaissance, Classic, Romantic and 20th Century styles, Korean notation, simplified notations for children, Braille, etc.. ISO/IEC 14496-23:2008 specifies Symbolic Music Extensible Format (SM-XF) an XML based language used to encode musical scores as main scores, single parts and the associated lyrics; Symbolic Music Formatting Language (SM-FL) an XML based language used to define the rendering rules that are applied to the SM-XF format for rendering it; Symbolic Music Synchronization Information (SM-SI) a binary format describing the synchronisation information between the SMR elements and the other audiovisual elements; syntax and semantics of the SMR bitstream.