>After reading, what seems like a lot of material, I'm still in doubt why
>DCT isnt used in audio-compression. Seeing as DCT assumes mirror
symmetry,
>my only idea for not validating DCT over MDCT is that with real-life
>signals you can rarely (if ever) expect a signal to have that property?
Is
>that correct or is there a better explanation.
>
>
>

Having read a little more, MDCT reduces spectral leakage by multipling a
Hann window (or some other sine-window). Does that mean that DCT doesnt
have spectral leakage?

eblade wrote:

> After reading, what seems like a lot of material, I'm still in doubt why
> DCT isnt used in audio-compression. Seeing as DCT assumes mirror symmetry,
> my only idea for not validating DCT over MDCT is that with real-life
> signals you can rarely (if ever) expect a signal to have that property? Is
> that correct or is there a better explanation.

Never having tried it, I think it might be too audible.

I am noticing more and more the little squares in digital
television, especially on fast changing scenes.
(When I first noticed it on the olympic logo going in
and out of a commercial break I thought it was a new special
effect.  Later I decided it was an artifact.)

The rules for what is inaudible and can be removed are somewhat
more complicated, but at the lower data rate you can do a lot
more processing.

-- glen

After reading, what seems like a lot of material, I'm still in doubt why
DCT isnt used in audio-compression. Seeing as DCT assumes mirror symmetry,
my only idea for not validating DCT over MDCT is that with real-life
signals you can rarely (if ever) expect a signal to have that property? Is
that correct or is there a better explanation.