Technical Information
JMB v 1.0 – 8th Dec 2003
V4 Presets and Usage
Introduction.
This document is intended as an introduction to the style of DSP Presets in 861v4 & G68, for customers
who are already familiar with earlier Meridian processors such as the 561, 568 or earlier 861 versions.
861v4, 861v3.5 and G68 share the same decoder modes and DSP presets. This is at the point in time
where they incorporate THX UltraII Cinema and Dolby PLIIx.
Basic Preset structure - why have we changed it?
In older products a Preset was linked directly to a type of audio stream. E.g. “Digital” was a Preset for
Dolby Digital multichannel streams only, “Dig THX” added THX extensions to the basic Dolby Digital
mode.
Adding extra processing modes, such as Dolby PLII and THX Surround EX, was beginning to make the
range of options quite complicated - particularly in the GUI, where the user is presented with all of the
possible options at once.
For these reasons the processing performed in the 861 and G68 is split into two parts, the decoder and
the mode. The mode is what the user sees as a ‘Preset’, the decoder is automatic and does not require
any settings or adjustment.
This presents a uniform set of options, based on how many channels of audio are actually on the source
medium.
Decoder
Speakers
Dolby Digital 2.0
DTS 2.0
MPEG 2.0
2-channel PCM
2-channel analogue
Direct
Music
Trifield
Ambisonics
Super Stereo
Music Logic
Mono
TV Logic
PLIIx Music
PLIIx Movie
PLIIx THX
Decoder
Speakers
Dolby Digital 5.1
DTS 5.1
MPEG 5.1
Multichannel PCM
Multichannel analogue
Discrete
Cinema
THX
PLIIx Mov6
PLIIx Mus6
THX EX
THX UltraII
THX Music
The decoder mechanism.
861 and G68 both automatically select the decoder based on whatever stream is coming in, be it Dolby
Digital, DTS, MPEG or PCM. The stream display exists in the same form as previous processors. E.g.
“DVD AC3 3/2.1 48k”
Meridian Audio Limited, Stonehill, Stukeley Meadows, Huntingdon, Cambs PE29 6EX
Tel +44 1480 445678 Fax +44 1480 445686
http://www.meridian-audio.com/
