> It is actually not so bad. The filter banks create some leakage,
> so the i'th coefficient is not a perfect cosine wave, but it
> is more or less like this:
>
>
> 576 coefficients representing 576 samples.
> 0th coefficient is the constant mode (frequency = 0)
> 575 coefficient is the highest frequency. At 44.1kHz, this is 22.05kHz.
>
> So the frequency of the i'th coefficient is:
>
> (sampling_rate/2)*(i/575)
>
> For example, 44.1kHz scalefactor 1 contains MDCT coefficients 0,1,2,3,
> which is 0-115Hz. For short blocks, change 575 to 191.
Ok, but how do you know wich coefficient goes in wich scalefactor? I didn't
succeeded in finding it in the code, so I tryed with the C7 and C8 ISO
tables, but it doesn't works, as I don't have 576 coefficients.
Btw, it seems that my formula for the ATH doesn't work for frequencies lower
than 300Hz
Regards,
Gabriel Bouvigne - France
[EMAIL PROTECTED]
icq: 12138873
MP3' Tech: www.mp3tech.org
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