信息技术 通用数字音频-可视系统 第3部分:外形:技术域

[中文适用范围]： ISO/IEC 16500 的这一部分“轮廓：技术领域”描述了与 ISO/IEC TR 165001 中定义的轮廓相关的系统功能和 DAVIC 工具。ISO/IEC 16500 的这一部分的目标是指导实施者了解 ISO/IEC 16500 中与每个轮廓中系统实施相关的部分，并展示各种工具之间的关系。本规范的另一个目标是说明必须实施哪些特定的 DAVIC 工具才能实现可互操作的系统组件。由于系统组件成本和服务收入之间的潜在权衡可能会因地理位置和时间等因素而有很大差异，因此这种权衡被视为超出了 DAVIC 的范围，因此需要参与系统实现的各方就工具集的更详细的“微观分析”达成一致。通过实施特定地理区域内的增强广播服务所使用的所有已定义的 DAVIC 工具，可以设计出与该区域内的增强广播服务等完全可互操作的 STB。为了协助上述微观分析活动，与特定轮廓相关的 DAVIC 工具按以下方式构建。一组 DAVIC 工具（ISO/IEC 16500 的子条款/条款）共同实现完整的系统功能（例如，同步多媒体信息的可靠传输），并将它们分组。该组被称为“系统功能”。对于每一组，都给出了总体信息性描述，并在表格中详细列出了所包含的 DAVIC 工具。如果适用，还会指出工具的依赖关系。从轮廓的用户和市场领域（参见 ISO/IEC TR 16501）得出的功能要求完全映射到上述系统功能列表。 [外文原描述]： This part of ISO/IEC 16500 on "Contours: Technology Domain" describes the system functions and DAVIC tools relevant to the Contours defined in ISO/IEC TR 165001. A goal of this part of ISO/IEC 16500 is to guide implementers to those parts of ISO/IEC 16500 which are relevant for the implementation of the systems in each Contour and to show the relation between the various tools. Another goal of this specification is to state which specific DAVIC tools have to be implemented to realize interoperable system components. As the underlying trade-off between system component cost and service revenue may vary considerably, e.g., by geographical location and time, this trade-off is deemed to be outside of the scope of DAVIC and hence a more detailed "micro profiling" of the tool set needs to be agreed upon between the various parties involved with the realization of a system. An STB that is fully interoperable with, for example, Enhanced Broadcast Services within a certain geographical area, can be designed by implementing all defined DAVIC tools used by the Enhanced Broadcast Services in that area. In order to assist the above mentioned micro-profiling activity the DAVIC tools relevant to a specific Contour have been structured in the following way. A collection of DAVIC tools (sub/clauses of ISO/IEC 16500) which together realize a complete system function (e.g., the reliable transmission of synchronized multimedia information) are grouped together. The group is identified as "system function". For each of these groups an overall informative description is given and a table listing in detail the included DAVIC tools. For the tools dependencies are indicated if applicable. The functional requirements derived from the User & Market Domain of a contour (see ISO/IEC TR 16501) are fully mapped to the above list of system functions.