Interactive Audio Special Interest Group IASIG.org
I3DL2
MIDI.org

System Sound Channels Type Audio RAM
NES 5 4 analog + 1 pcm 2k
Turbo Grafix 16 6 FM 8k
Sega Genesis 6 5 FM + 1 FM or pcm 8k
SNES 8 sampling 64k
Neo Geo 15 7 sampling + 8 FM 64k
Jaguar N/A ( software ) sampling, FM, AM2 M
Playstation 24 sampling 512k
Saturn 40 32 sampling + 8 FM 540k
Nintendo 64 N/A ( software ) sampling 9/2 M
Dreamcast 64 sampling 2 M
Playstation2 48 sampling 2 M
Xbox 256 sampling 64 M

LinearPCM (uncompressed audio, 8channels 24bit 96kHz, max 6144kBit/s)
ATRAC3plus (256kbps [Hi-SP], 64kbps [Hi-LP], 48kbps)
ATRAC3 (132kbps, 105kbps, 66kbps)

Dolby formats
Dolby digital 1.0 (1 channel - mono)
Dolby digital 2.0 (2 channel - stereo)
Dolby surround 4.0 DS (2 channel - 4 virtual channel)
Dolby Pro Logic (4 channel)
Dolby Pro Logic IIx (2 channel - virtual 7.1 surround channel)
Dolby digital 5.0 (5 channel)
Dolby digital 5.1 (5 channel + 1 bass channel)
Dolby digital 5.1 EX (5 channel + 1 bass channel - 6 + 1 virtual channel)
[Virtual dolby surround]

DTS - Digital Theatre Systems (max 768-1536kBit/s)
DTS 5.1 (5 channel + 1 bass channel)
DTS 5.1 ES (5 channel + 1 bass channel - 6 + 1 virtual channel)
DTS 6.1 ES discrete (6 channel + 1 bass channel)
SDDS Sony Dynamic Digital Sound

Codecs
MPEG 1 (Expert Group)
layer 1
layer 2 MP2 (7 channel + 1 bass channel)
layer 3 MP3
MPEG 2 AAC (Expert Group)
MPEG 4

AAC
ATRAC (Adaptive Transform Accoustic Coding) - used with MiniDisc
Dolby AC-3 / QDesign
DivX Difital Video Express

HDA High definition audio (intel, 32bit multi-channel, Dolby Pro Logic IIx)

Xvid
MP3 Fraunhofer
MP3 Lame - www.mitiok.cjb.net
MP3 Pro - www.mp3pro.ws
Ogg Vorbis - www.vorbis.com
Real Audio - www.real.com
Windows Media Audio WMA
TwinVQ