SPU

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Overview[edit | edit source]

Sound Processing Unit of the PlayStation.

  • Supports ADPCM sources with up to 24 channels
  • Sampling rate of up to 44.1 kHz
  • 512 KB RAM
  • PCM audio source
  • Supports MIDI sequencing
  • Digital effects include:
    • Pitch modulation
    • ADSR-Envelope
    • Looping
    • Digital reverb

All versions except CXD2941R require 4 MBits / 512 KBytes of external DRAM. CXD2941R has this RAM internally.

Revisions[edit | edit source]

Dedicated SPU[edit | edit source]

  • CXD2922Q (PU-7, PU-8-11)
  • CXD2925Q (PU-8 from -21 and up, PU-16, PU-18, PU-20)

DSP + CD-decoder + CD-decoder's RAM + SPU + audio-DAC[edit | edit source]

  • CXD2938Q (PU-22, PU-23, PM-41 up to PM-41-61)

DSP + CD-decoder + CD-decoder's RAM + SPU + SPU's RAM + audio-DAC[edit | edit source]

  • CXD2941R (PM-41-71, PM-41-82)
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