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by TD-Linux
3287 days ago
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Opus does something similar in the frequency domain, but much simpler. It just copies codewords (minus energy) from lower bands to higher bands. It also lets you signal the energy of the copied bands (something you wouldn't have access to if reconstructing blindly). See "band folding" here: https://people.xiph.org/~xiphmont/demo/celt/demo.html |
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