刚果（金

[中文适用范围]： 本文档指定了一种统一语音和音频编解码器，该编解码器能够编码具有任意混合语音和音频内容的信号。该编解码器的性能与专门针对语音或一般音频内容编码的最佳已知编码技术相当或更优。该编解码器支持在高比特率下进行的单声道和多声道编码，并提供感知透明的质量。同时，它能够在保留完整音频带宽的同时，在非常低的比特率下实现非常高效的编码。 [外文原描述]： This document specifies a unified speech and audio codec which is capable of coding signals having an arbitrary mix of speech and audio content. The codec has a performance comparable to, or better than, the best known coding technology that might be tailored specifically to coding of either speech or general audio content. The codec supports single and multi-channel coding at high bitrates and provides perceptually transparent quality. At the same time, it enables very efficient coding at very low bitrates while retaining the full audio bandwidth. This document incorporates several perceptually-based compression techniques developed in previous MPEG standards: perceptually shaped quantization noise, parametric coding of the upper spectrum region and parametric coding of the stereo sound stage. However, it combines these well-known perceptual techniques with a source coding technique: a model of sound production, specifically that of human speech.