opus - Feb 2010 - compute_ebands

Hi All,

Is the following loop in function compute_ebands meant to work out the
nearest celt frequency bin to a bark critical band? ?If so why an
offset is required to be considered? Thanks in advance if somebody can
explain it.

Thanks,
Hamid

   /* Spacing follows critical bands */
   for (i=0;i<high;i++)
   {
      int target = bark_freq[lin+i];
      eBands[i+low] = (2*target+offset+res)/(2*res);
      offset = eBands[i+low]*res - target;
   }

The offset is there because what's even more important than getting the
nearest
frequency bin is getting the right *width* for the band.

   Jean-Marc

Quoting Hamid Zare Doust <hzdoust at googlemail.com>:
> Hi All,
>
> Is the following loop in function compute_ebands meant to work out the
> nearest celt frequency bin to a bark critical band? ?If so why an
> offset is required to be considered? Thanks in advance if somebody can
> explain it.
>
> Thanks,
> Hamid
>
>    /* Spacing follows critical bands */
>    for (i=0;i<high;i++)
>    {
>       int target = bark_freq[lin+i];
>       eBands[i+low] = (2*target+offset+res)/(2*res);
>       offset = eBands[i+low]*res - target;
>    }
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>