APU

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The MCPX contains an APU (Audio Processing Unit).

  • SSL = Stream Segment List
  • SGE = Scatter Gather Entry
  • PRD = Physical Resource Descriptor (Same thing as SGE?!)

Global Processor (GP)

  • GPS = GP Scratch (?)
  • GPF = GP Frames (?)

Encode Processor (EP)

  • EPS = EP Scratch (?)
  • EPF = EP Frames (?)

Voice Processor (VP)

  • VPV = VP Voices
  • VPSGE = VP SGEs
  • VPSSL = VP SSLs

Voice lists

  • 2D
  • 3D
  • MP

Voice structure

This is 0x80 bytes

Pitch calculation

p = 4096 * log2(f / 48000)
f = pow2(p / 4096) * 48000

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