Sierra DPCM: Difference between revisions

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* Company: [[Sierra Entertainment]]
* Company: [[Sierra Entertainment]]


This is a set of DPCM codecs used in [[Sierra Audio]] and [[VMD]].
This is a set of DPCM codecs used in [[Sierra Audio]], [[VMD]], and [[RBT]] files.
 
=== Old DPCM ===
Decoding of DPCM is very simple: read nibble, get corresponding delta value from table and update current sample value.
 
Delta table:
 
  { 0,  1,  2,  3,  6, 10, 15, 21,
  -21,-15,-10, -6, -3, -2, -1, -0}
 
=== New DPCM ===
New scheme differs from old one by delta table (note the order of its second part):
 
  { 0,  1,  2,  3,  6,  10,  15,  21,
  -0, -1, -2, -3, -6, -10, -15, -21}
 
=== 16-bit DPCM ===
TODO
 
[[Category:Audio Codecs]]
[[Category:DPCM Audio Codecs]]
[[Category:Game Formats]]
 
 
 
=== Old DPCM ===
Decoding of DPCM is very simple: read nibble, get corresponding delta value from table and update current sample value.
 
Delta table:
 
  { 0,  1,  2,  3,  6, 10, 15, 21,
  -21,-15,-10, -6, -3, -2, -1, -0}
 
=== New DPCM ===
New scheme differs from old one by delta table (note the order of its second part):
 
  { 0,  1,  2,  3,  6,  10,  15,  21,
  -0, -1, -2, -3, -6, -10, -15, -21}
 
=== 16-bit DPCM ===
TODO
 
[[Category:Audio Codecs]]
[[Category:DPCM Audio Codecs]]
[[Category:Game Formats]]
 
 
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=== Old DPCM ===
Decoding of DPCM is very simple: read nibble, get corresponding delta value from table and update current sample value.
 
Delta table:
 
  { 0,  1,  2,  3,  6, 10, 15, 21,
  -21,-15,-10, -6, -3, -2, -1, -0}
 
=== New DPCM ===
New scheme differs from old one by delta table (note the order of its second part):
 
  { 0,  1,  2,  3,  6,  10,  15,  21,
  -0, -1, -2, -3, -6, -10, -15, -21}
 
=== 16-bit DPCM ===
TODO
 
[[Category:Audio Codecs]]
[[Category:DPCM Audio Codecs]]
[[Category:Game Formats]]
 
 
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=== Old DPCM ===
=== Old DPCM ===

Latest revision as of 23:22, 13 February 2020

This is a set of DPCM codecs used in Sierra Audio, VMD, and RBT files.

Old DPCM

Decoding of DPCM is very simple: read nibble, get corresponding delta value from table and update current sample value.

Delta table: 

 { 0,  1,  2,  3,  6, 10, 15, 21,
 -21,-15,-10, -6, -3, -2, -1, -0}

New DPCM

New scheme differs from old one by delta table (note the order of its second part): 

 { 0,  1,  2,  3,  6,  10,  15,  21,
  -0, -1, -2, -3, -6, -10, -15, -21}

16-bit DPCM

TODO

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