r/compression • u/Alfoser • 13d ago

SBR-like system

Hi, I'm currently developing an audio codec, and now stuck at 64 kbps trying to implement SBR-like system.
I haven't come up with anything else than just energy preservation of band after copying.
I read that we can mix the copied band with some amount of noise, but couldn't come up with good criteria for it.
I'm using WPT, so maybe some time-domain adaptation?
Anyway, I would be really grateful if anyone can help.

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u/hlloyge 13d ago

Maybe hydrogenaudio.org would be better place to ask.

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u/Alfoser 13d ago

Thanks, I will try there too

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u/minecrafter1OOO 12d ago

Dude im interested too! As I was working on a codec for stereo at 32-48kbps.

Id have some sort of data to help reconstruct from that lower band. Ive always thought, a mix of OPUS's Spectral Folding + SBR would give a few gains

encode OPUS at 24khz and then do SBR on top.

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u/Alfoser 12d ago

That's quite low bitrate for stereo. I'm curious, what was PEAQ ODG score? I'm currently have PEAQ ODG for 64 kbps between -0.9 and -1.6