[georgia]

Dolby Stereo 1975 Cinema use. FL FR with C and RearMono matrixed
Dolby SR 1986 Cinema use. FL FR with C and RearMono matrixed
Dolby Surround 1986 First Home use. Analog. FL FR with C and RearMono matrixed
Dolby Pro Logic > 1986 Improved Dolby Surround. Upmix Stereo to Surround 4.0. FL FR C RearMono(x2)
Dolby Pro Logic II

2000 Improved Dolby Pro Logic. Upmix Mono(in Matrix mode) or Stereo to Surround 5.1 in either Matrix, Movie, Music, or Game mode.
FL FR C SL SR SUB

Dolby Pro Logic IIx
Upmix Stereo or Surround 5.1 to 6.1 or 7.1 in either Movie, Music, or Game mode.
FL FR C SL SR SUB and RearMono(x2)
Jazz, Hall & Stadium
Extra Decoders implemented by manufacturers.
These add effects like echo and delay to change sound.

Dolby Digital Adaptive Transform Coder 3 (AC3) 1992 Film
1995 Laser Disc
Discrete channel encoder/decoder. Pro Logic Decoder can be used for downmixed stereo inputs.
FL FR C SL SR SUB

Dolby Digital EX/Dolby Digital Surround EX 1999 6.1 or 7.1 (5.1 with Center Rear matrixed onto SL & SR)
FL FR C SL SR SUB RearMono(x1 or 2x)

Dolby Digital Plus
High bitrate. Currently uses 7.1 channels with support for more.

Dolby TrueHD Lossless encoder for High Definition Video Sound.
Eight full-range channels of 24-bit/96 kHz. Higher Bitrate than DD-Plus.

Dolby Digital Live On the Fly 5.1 encoder for Games.



cheers
geo