TC Electronic SYSTEM 6000 MKII Algorithm Manual

47
MD-4
delayinfluenced“wet”partofthesignal.Insidethe
algorithm,beforethelimiter,the“dry”and“wet”signalsare
summed.
When Trim and Band gains are all 0.0 dB, gain through
MD-4 in parallel mode is unity, provided the signal is below
the Threshold of compression.
Usershavesuggestedanalternativecalculationof
gain for Parallel Mode, namely to provide unity gain
with Trim at 0.0 dB, and all Band Gains at Off. If
you too prefer parallel compression to be purely
additive,walkthisway:SetTrimat+6.0dB,and
turn all Band Gains Off. This will cause gain to be
unity. Now, use the Band Gains to add gain. In this
case,+6dBwillbereachedwhentheBandGains
are at 0.0 dB. If the current way of setting gain in
Parallel Mode is changed in a future software
update, information will be provided to translate
presetsbasedonthe3.50gainstructure.
DXP mode
DXP Mode is a new five-band detail enhancer with an
integratedBrickwall2LimiteratitsOutput.DXPMode
was designed as an alternative to traditional dynamics
processing - to lift up low level subtleties rather than
boosting and limiting elements that are already loud.
As seen on the level diagram, an inactive processing
area is available above the Reference Level but below
the Threshold of Limiting, so material neither too soft, nor
too loud can be left unaltered. Consequently, DXP mode
offers a flexible tool for hi-res processing, which may be
used with good results even on sensitive material such
aclassicalorothertypesofacousticmusic.Usedon
spokenwordorsinging,DXPmodecanimprovespeech
intelligibility, and add extra character and expression.
Individual frequency bands may have different detail
enhancement applied, and DXP can be combined with MS
discrimination, for instance to lift up low level de-correlated
components(wide=S)suchasambience,ortotreatfully
correlatedcomponents(center=M)inacertainway.Preset
examplescanbefoundinEngineFactoryBank10,
decade5.
DXPprocessingdoesn’taddanythingtothesignalthat
isn’ttherealready.Itmerelymagnifiesthedetailsor
spectral components which previously may have been
masked.LikeNormalandParallelmode,resolutionofDXP
mode is 48 bit fixed point to maintain a processing margin
over the source material.
Fromauserspointofview,thismodeintroducesanew
parameter on each band, Steer, instead of Threshold.
Steer determines the slope and boost of that particular
band as shown in the level diagram. Bands hit unity gain (0
dB gain) at the Reference Level, so low level boosting only
takesplacebelowthatlevel,andisatthemaxbeloweach
band’sThreshold.Note:Unitygaindependsonthecrest
factor of the input signal. Reference Level should be set
approximately 2 dB lower if a unity gain point is determined
with a tone. Alternatively, Band Gains may be trimmed
down by the same amount.
If low level Steer gain brings up too much noise, a Defeat
function is available to revert to unity gain a certain number
of dB below the DXP threshold.
Example:
With the following settings:
- LimitThresholdsetat-3dBFS,
- ReferenceLevelat-12dBFS,
- DXP Threshold at -14 dB and
- Defeat at -20 dB,
therewillbeunitygainbetween-12dBFSand-3dBFS,
andfulllowlevelgainbetween-26and-46dBFS.The
slopewithwhichMD4revertstounitygainbelow-46dBFS
is determined by the Defeat Ratio.
Look Ahead Delay
Range:0to15ms
LookAheadDelayintroducesanaudiodelaytoallow
processingtotakeplaceatpreciselytherighttime.It
influencesthe5Bandsectionregardlessofitsmodeof
operation (Normal, Parallel and DXP plus gain Defeat). The
Brickwalllimiterattheoutputisindependentofthissetting,
andusesaitsownlookahead.
Eachofthe5bandshasitsownlookaheaddelay,which
canneverbelongerthantheLookAheadDelayparameter.
However,lookaheadintheindividualbandsmaybe
shorterthanthattopreventattacktooperate“aheadof
time”.Forexample,ifLookAheadDelayissetat10.0ms,
andAttackintheHiBandat3.0ms,thatparticularband
willonlyusealittlemorethan3msofthelookaheaddelay
it has at its disposal. The actual audio delay is of course
alwaysthesameinall5bands.
Tip:IfAttacktimesofdoubletheLookAheadDelayor
lessareusedinthe5Bandsection,thissettingmayhave
abiginfluenceonMD4’speakhandlingandtherefore
sound.However,iflongerAttacktimeshavebeenchosen,
LookAheadDelaywillnotmakemuchdifferencetothe
processing - besides from introducing a delay in the signal

TC Electronic SYSTEM 6000 MKII Specifications

General

Brand	TC Electronic
Model	SYSTEM 6000 MKII
Category	Computer Hardware
Language	English