[Tremor] Reg : Frame size and memory

[Dhanabal]

I have a few questions regarding frame size and memory.

1.Why is that only frame sizes 256  and 2048 are used mostly even though frame size can vary from 64 to 8192.
2. What might be the max input buffer size to hold a frame with max i/p bitrate.
3. What is the maximum possible size of a codebook?
Answers to these questions would help me a lot. Thanks in advance.

-Thanks and Regards
Dhanabal
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