[Vorbis] Floor 1 Decode

[sameen eajaz]

Dear All,

Floor 1 decoder uses FLOOR_fromdB_LOOKUP table. The purpose of this table
is not clear to me. It is also not explicitly explained in the vorbis
specification.

As i have understood is that it is used to dequantise the "Y" values
which are decoded from the bitstream during curve synthesis. Is this
correct ?

If so why does the table have only 256 elements ? This would imply that
the "Y" value decoded from the bitstream should has a range from "0" to
256. ? Does the encoder ensure this ?

In section 1.3.2.8 of the vorbis specification "However, floor vector
values can span ~140dB (~24 bits unsigned)" .  What is this referring to
? Is it the final ( dequantised ) floor vector ?

warm regards,

Sameen

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