信息技术.视听对象编码.第26部分:音频一致性

[中文适用范围]： 本部分规定了如何设计测试以验证压缩数据和解码器是否符合ISO/IEC 14496-3中规定的要求。在本部分的ISO/IEC 14496中，未专门涉及编码器。如果编码器生成的压缩数据符合ISO/IEC 14496-3中规定的句法和语义比特流负载要求，则可以称其为ISO/IEC 14496编码器。压缩数据和解码器的特性是针对ISO/IEC 14496-3定义的。压缩数据特性定义了压缩数据中利用的标准子集。例如，应用的采样率和比特率参数的值或范围。解码器特性定义了所应用解码过程的属性和能力。属性的一个例子是应用的算术精度。解码器的能力指定了解码器可以解码和重构的压缩数据，通过定义可解码压缩数据中可利用的标准子集。如果压缩数据的特性在解码器能力指定的标准子集内，则压缩数据可以被解码器解码。描述了测试压缩数据和解码器是否符合ISO/IEC 14496-3中定义的要求的程序。给定所声称的特性集合，必须满足的要求完全由ISO/IEC 14496-3确定。本部分的ISO/IEC 14496总结了这些要求，将其交叉引用到特性，并定义了如何测试与这些要求的符合性。给出了构建测试以验证解码器符合性的指南。提供了一些根据这些指南实现的压缩数据示例，作为本文件的电子附录，通常与其未压缩的对应物（参考波形）一起提供。 [外文原描述]： ISO/IEC 14496-26:2010 specifies how tests can be designed to verify whether compressed data and decoders meet requirements specified by ISO/IEC 14496-3. In ISO/IEC 14496-26:2010, encoders are not addressed specifically. An encoder may be said to be an ISO/IEC 14496 encoder if it generates compressed data compliant with the syntactic and semantic bitstream payload requirements specified in ISO/IEC 14496-3. Characteristics of compressed data and decoders are defined for ISO/IEC 14496-3. The compressed data characteristics define the subset of the standard that is exploited in the compressed data. Examples are the applied values or range of the sampling rate and bitrate parameters. Decoder characteristics define the properties and capabilities of the applied decoding process. An example of a property is the applied arithmetic accuracy. The capabilities of a decoder specify which compressed data the decoder can decode and reconstruct, by defining the subset of the standard that may be exploited in the decodable compressed data. Compressed data can be decoded by a decoder if the characteristics of the compressed data are within the subset of the standard specified by the decoder capabilities. Procedures are described for testing conformance of compressed data and decoders to the requirements defined in ISO/IEC 14496-3. Given the set of characteristics claimed, the requirements that must be met are fully determined by ISO/IEC 14496-3. ISO/IEC 14496-26:2010 summarises the requirements, cross references them to characteristics, and defines how conformance with them can be tested. Guidelines are given on constructing tests to verify decoder conformance. Some examples of compressed data implemented according to these guidelines are provided as an electronic annex to this document usually together with their uncompressed counterparts (reference waveforms).