Re: QDM* IMDCT

Mike Melanson wrote:

>Hi,
>	I did a little digging in QDesign tonight and found an interesting
>function. I'm no expert on the matter, but I think this may be one of them
>IMDCT doohickeys that are so prevalent in perceptual audio codecs. Can
>anyone "skilled in the art" (as they say in the patent literature) confirm
>or deny, compare or contrast with known IMDCTs? Note that I may have a few
>functional details mixed up, so don't take it as authoritative (and a few
>detals are missing at the end right now).
>
>	Have fun...
>--
>	-Mike Melanson
>  
>

Hmm, that would make quite sense, with the DCT you would get only real 
numbers to
work with. A simple thing for an encoder using DCT would be to do some 
kind of noise
masking in the frequency domain and RL-code the zeros between the 
relevant signals.


/Benjamin



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