Specifications

File Format B-9
Block Type 8
This is a special block that carries only the digitized sound attributes. It MUST precede
Block Type 1. Usually, this block precedes the stereo or high speed digitized sound
data.
The Block Header is organized as follows:
BYTE bBlockID; // == 8
BYTE nBlockLen[3]; // 3-byte block length
WORD wTimeConstant; // 2-byte Time Constant
BYTE bPackMethod; // Packing Method
BYTE bVoiceMode; // mono or stereo
The header is followed immediately by Block Type 1.
Here is a discussion of various fields:
bBlockID
The Block Type identifier is 8.
nBlockLen
Length of the block (in bytes), excluding the
bBlockID
and
nBlockLen
fields.
The value is 4.
wTimeConstant
This is a 2-byte field which indicates the
Time Constant
of the digitized
sound data in the Block Type 1. The calculation of the Time Constant is
the same as described on Block Type 1, but the whole word of the result
is stored here.
For a 44 100Hz sampling rate mono digitized sound, the Time Constant is
calculated as follows:
Time Constant = 65536 - (256 000 000 / 44 100)
= 59732 (0E95H)