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当相同码流馈送至MPEG-1解码器时,解码器将只对码流的MPEG-1部分进行解码,而忽略所有附加的多声道信息。由此它将输出在MPEG-2编码器中经向下混合产生的两个声道。这种方式实现了与现有的双声道解码器的兼容性。也许更为重要的是,这种可分级的方式使得即使在多
When the same code stream is fed to the MPEG-1 decoder, the decoder will decode only the MPEG-1 portion of the code stream, ignoring all additional multi-channel information. It will therefore output two channels resulting from downmixing in the MPEG-2 encoder. This approach enables compatibility with existing two-channel decoders. Perhaps more importantly, this scalable approach makes even more