[Mp4-tech] Compatibility of Mpeg-4 AAC.

[岡本光平]

Hello Everyone,
 I've read this brochure of "What's AAC?" on the mp4 Industry Forum page.
It declares the Mpeg-4 AAC as the "Most powerful audio codec..." , 
and lists as a reason that my country has chosen Mpeg-2 AAC for digital broadcast.
 Does this mean that the Mpeg-4 AAC covers the Mpeg-2 AAC entirely?
Is a Mpeg-4 AAC supported device able to encode/decode Mpeg-2 AAC content?
Regard,
Kohei Okamoto
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