Frequency Inversion in MP3
- From: "coolup" <coolup012@xxxxxxxxxxxxx>
- Date: 31 Oct 2005 04:33:24 -0800
hi All
In MP3 encoder algorithm, after the PQMF filtering, there is a step in
which the odd samples in odd subbands are multiplied by
-1. After this the MDCT is applied. Does any one here have any idea why
this is done.
I think it will invert the frequencies, that is lower
frequencies become higher and vice versa. But why is it done I don't
understand. Thanks for any replies.
.
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