Kurzweil PC3LE8 Specifications download pdf (Page 80)

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Program Mode

The Program Editor

Algorithm Basics

Eachofthe59availablealgorithmsrepresentsapresetsignalpath. WithournewDynamic

V.A .S.T.feature,youcaneditanypresetsignalpathandmakeyourown,uniquealgorithms,but

thatwillbeexplainedfurtheroninthissection.Takealook atAlgorithm1 inthediagrambelow.

It’soneofthesimplestalgorithms.

TheDSPfunctionsarerepresentedbytherectangularblocks.Thelinesconnectingtheblocks

togetherindicatestheflowofthedigitalsignalfromlefttoright;theyrepresentwhatwecallthe

“wire”ofthealgorithm:theactualphysicalpaththatthesignalfollowsthrough

thealgorithm.

SelectingdifferentalgorithmscanbecomparedtoconnectingdifferentDSPfunctionswith

differentwiringdiagrams.

Thinkoftheleftsideofeachblockasitsinput,andtherightsideasitsoutput.Dependingonthe

algorithm,thesignalmaysplitintotwowires,enablingpartofthesignal

tobypasscertain

portionsofthealgorithm.Splitwiresmayrejoinwithinthealgorithm,ortheymaypassallthe

waythroughassplitsignals.Ifthelastblockhastwowiresatitsoutput,wecallitadouble‐

outputalgorithm.Ifithasonewire,it’sasingle‐output

algorithm,eveniftherearetwowiresin

earlierportionsofthealgorithm.

Eachblockofthealgorithmrepresentsacertainfunctioninthesignalpath.Ineverynon‐

cascadedalgorithm(seeAltInputforAlgorithms(CascadeMode)below),thesignalflowsfirst

throughaone‐stageDSPfunctionthatcontrols

thepitchofthesamplesinthekeymap(this

functionisrepresentedasablocklabeledPITCHintheupperright‐handcornerofthedisplay).

Infact,thefirstDSPfunctionineachalgorithmalwayscontrolspitch,eventhoughitdoesn’t

applyineveryinstanceand,aswillbe

explainedlaterinthissection,itisbypassedincascaded

algorithms.Similarly,thelastDSPfunctionalwayscontrolsthefinalamplitudeofthesignal

(thisfunctionisrepresentedasablocklabeledAMPintheupperright‐handcornerofthe

display).

Thenumberoffunction‐parametersaDSPfunctioncan

havedependsontherelativesizeofits

function‐blockontheAlgorithmpage(fourslotsisthelargestblocksize.)Forinstance,a

function‐blockthatisthreeslotslongcanhaveuptothreefunction‐parameters,whereasa

function‐blockthatistwoslotslongcanhaveupto

twofunction‐parameters.Foreachfunction‐

parameter,there’sacorresponding“subpage”onboththeDSPCTLandDSPMODpages.Onthe

DSPCTLsubpages,therearefineadjustandhard‐wiredparameterswithwhichyoucanmake fixed

adjustmentstothefunction‐parameter.OntheDSPMODsubpages, thereareprogrammable

parametersthat

youcanassigntoanycontrolsourceintheControllerListtomodulatethe

function‐parameter.Theaboveitalicizedparameter‐typesaredescribedinCommonDSPControl

Parameters on page 6‐29.Moreinformationonthe subpagescanbefoundinTheDSPControl

(DSPCTL)Page on page 6 ‐33 andTheDSPModulation(DSPMOD)Page

on page 6‐35.

Highlightinganyofthefunction‐blocksontheALGpageandpressingtheEditbuttontakesyou

totheDSPCTLpage.

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Kurzweil PC3LE8 Specifications Page 80

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