[Mp4-tech] SBR: Time/frequency grid

[Andreas Schneider]

Hello Devilal,
the SBR time frequency grid determines how an SBR frame is subdivided in 
time and frequency direction. It allows to signal different SBR energy 
values within one frame.
A more detailed overview of the meanings of the SBR frame classes can be 
found in 4.6.18.3.3
Regards,
Andreas
mp4-tech-bounces lists.mpegif.org wrote on 05.01.2024 11:51:40:
> The standard says: The time/freq grid part of the bitstream payload 
> describes the number of SBR envelopes and noise floors as well as 
> the time segment associated with each SBR envelope.
> 
> I don't understand what exactly is the time/frequency grid and how 
> is helps in SBR. 
> I could not understand the significance of the SBR frame classes 
> FIXFIX, FIXVAR....
> 
> 
> -- 
> Regards,
> Devilal 
> 
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--
Andreas Schneider
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