[Mp4-tech] SBR: Time/frequency grid

[Devilal]

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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Mobile: +91-9986423985
email: devilal gmail.com
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