PROEL DSO480 - Output Limiter and D-Max Limiter; Program Limiter; D-Max Clip Limiter

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ProgramLimiterand“D‐Max”Limiter
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TheDSO480 unitshavetwolevelsofdynamicprotectiononitsoutputs–atraditionalprogramlimiter,anda
newlyintroduced“D‐Max”limiter.
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Program Limiter
Highperformancedigitalli mitersareprovidedforeachoutputwithcontroloverattacktime,releasetimeand
thresholdparameters‐seepage29fordetails.Thislevelofcontrolallowstheusertobalancetherequired
subjectivequalityofthelimiteragainstthedriverprotectionrequirements.Itdoesalsomeanthatan
incorrectlysetlimitermaysoundawful!Inparti
cular,aswithalllimiters,usingtoofastanattackorrelease
timewillresultinexcessivelowfrequencydistortion.IntheDesign a Crossoversub‐menuthereis
anoptionforautomaticlimitertimeconstants.Usethisoptionifyouareunsurehowtosettheti
me
constantsmanually.PROELrecommendtheuseoftheautomaticsetting.
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InthismodethetimeconstantswillbeautomaticallysetfromtheHigh‐Passfilterfrequencyaccordingtothe
tablebelow.
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Thetimeconstantsaresetbythehighpassfilterfrequencyforthatchannel.
HighPassFilter AutoAttackTime ReleaseTime
<10Hz–31Hz 45mS x16(720mS)
31Hz–63Hz 16mS x16(256mS)
63Hz–125Hz 8mS x16(128mS)
125Hz–250Hz 4mS x16(64mS)
250Hz–500Hz 2mS x16(32mS)
500Hz‐1kHz 1mS x16(16mS)
1kHz–2kHz 0.5mS x16(8mS)
2kHz–32kHz 0.3mS x16(4mS)
“D-Max” Clip Limiter
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Themainlimitationwithtraditionaldynamicscontrolistheinability oftheprocessingtoreacttruly
instantaneouslytothesignal.Oneofthemostsignificantadvantagesofdigitalsignalprocessingover
analogueistheabilitytodelaytheaudiosignalpreciselyandwithoutextensivecomplexhardware.Theentire
domainofdigitalsignalpr
ocessingisbasedaroundthecombinationofdelaying,multiplying,andaccumulating
numbers(representingsamplesofaudio)toimplementallthefiltersanddynamicsprocessingwehavecome
toexpecttoday.
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Inthecaseofdynamicsprocessing,beingable todelayasignalallowstheprocessormoduletodelaythemain
signalinrelationtothesidechain(thesignalbe
ingmonitoredrelativetothethreshold),sothatitcan
compensateforpeakspriortothearrivalofthemainsignal.
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