[Mp4-tech] subbands in Mpeg4 AAC

[Shreya Pathak]

Hello Ashish,
      Are you sure that the scale factor bands and subbands same ?
   Because one more person in Hydrogenaudio.org/forums mentioned that both are different and number of subbands is equal to 1024(MDCT coefficients).
PLease reply back immediately.
Thanks and Regards
Shreya
On Wed, 12 Jan 2024 Ashish Malot wrote :
>Hi,
>     All the info is available in the standard. Anyway....
>1. No of subbands vary for Long, Short blocks and for different sampling
>freqs.
>2. Yes.
>3. Standard allows for all or chosen subbands (ur wish...). TNS is
>applied only to higher part of the spectrum so TNS is not ON for All the
>subbands. Refer standard.
>
>bye,
>Ashish Malot
>
>Shreya Pathak wrote:
>
> >
> > Hi,
> >   1)I wanted to how many subbands are there in Mpeg4 AAC.
> >   2) Are the subbands and scale factor bands same ?
> >   3) Can Joint stereo coding, PNS and TNS be applied to all subbands
> > or only some parts of subbands.
> > Please reply immediately.
> > Thanks and Regards
> > Shreya
> >
> >
> > [Image]
> >
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