Segher Boessenkool wrote:
> _very_ few. Every mdct sample is about 38 Hz wide, so you wouldn't even cut
> away the first (or zeroeth, whatever) sample.
There is no such thing as 'zeroeth' !
Remember the "when does the millenium start" problem ? :-)
> The reason ISO recommends highpass filtering is to cut away the DC portions,
> which mp3 can't directly represents (it is a combination of the 0'th and
> 575'th sample. The 575'th normally gets set to zero, especially if you're
> lowpass filtering).
>
> You get DC in a long block, if the sound contains some components < 19 Hz.
>
> DC leads to high-frequency echoes. (Some kind of phantom image of the true
> sound at lower freqs).
Hmm , can you explain why this happens ?
Doesn't seem logical to me, but I'm no mp3/mdct expert.
> Dag dag,
>
> Segher
david balazic
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