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== Overview ==
== Overview ==
Sound Processing Unit of the PlayStation.
All versions except CXD2941R require. 4 MBits / 512 KBytes of external DRAM CXD2941R has this RAM internally.
 
* 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 ==
== Revisions ==
=== Dedicated SPU ===
=== Dedicated SPU ===
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* CXD2925Q (PU-8 from -21 and up, PU-16, PU-18, PU-20)
* CXD2925Q (PU-8 from -21 and up, PU-16, PU-18, PU-20)


=== DSP + CD-decoder + CD-decoder's RAM + SPU + audio-DAC ===
=== DSP + CD-controller + CD-controller's RAM + SPU + audio-DAC ===
* CXD2938Q (PU-22, PU-23, PM-41 up to PM-41-61)
* 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 ===
=== DSP + CD-controller + CD-controller's RAM + SPU + SPU's RAM + audio-DAC ===
* CXD2941R (PM-41-71, PM-41-82)
* CXD2941R (PM-41-71, PM-41-82)
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