With the introduction of HE AAC (also known as aacPlus) into several new broadcasting systems, the topic of how to best encode new and transcode pre-existing metadata such as dynamic range control (DRC) data, program reference level and downmix coefficients into HE AAC has gained renewed interest. This paper will discuss the means of carrying metadata within HE AAC and derived standards like DVB, and present studies on how to convert metadata persistent in different formats into HE AAC. Listening tests are employed to validate the results.
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