Sampling (Open Sampling System)
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2)Youcansampleexternalaudiosourcesviathe
OASYS’inputjacks(see“Samplingmode”1and2,
above).Atthistime,youcanmixtheOASYS’own
performancewiththeaudiosignalsfromtheexternal
sourceandsamplethecombinedresult,oryoucan
monitortheperformanceoftheOASYS
while
samplingonlytheexternalsourcefromtheinputjacks.
3)InSequencermodewhenyousampleanexternal
audiosourcethat’splayingalongwiththesong
playback,notedatawillbeautomaticallycreatedina
tracktotriggerthissampleattheappropriatemoment
inthesong.Thismeansthat
youcansampleyourvocal
orguitarperformancewhileplayingbackthe
sequencer.ThisiscalledtheIn‐TrackSampling
function.
Sampling frequency and bit resolution
Asshowninthediagram,samplingreadsthelevelof
theanalogsignalatfixedintervalsalongthetimeaxis,
andstoresthelevelsinmemoryasdigitaldata.
The“fixedintervals”mentionedabovearegenerally
expressedasthe“samplingfrequency.”48kHz
(kilohertz)meansthatsamplingisperformed48,000
times
eachsecond,andthattheintervalis1
(second)/48,000(times)=approximately0.00002083
(seconds)=approximately0.02083mS(millisecond).
Thehigherthesamplingfrequencyis,theclosertothe
originalanalogsignalthewaveforminmemorywill
be.
Eachlevelisread,andconvertedintodigitaldata.The
accuracyatthistime
isdeterminedbythebit
resolution.Thisprocessconvertsananalogsignalwith
infiniteresolutionintoadigitalsignalwithfinite
resolution.With16bitresolution,eachlevelis
indicatedin65,536steps(thesixteenthpoweroftwo).
Thegreaterthebitresolutionis,the closertothe
originalanalogsignal
thewaveforminmemorywill
be.
48kHz16bitsamplingisthesamequalityasinaudio
devicessuchasDAT.ACDuses44.1kHz16bit
sampling,whichisaslightlylowersampling
frequency.
How Sampling mode is organized
ThissectiondescribeshowsamplingontheOASYSis
organized.(Seethediagrambelow)
Samples and Multisamples
Samples
Thedatathatisrecorded(sampled)intointernal
memoryorloadedfromafileisreferredtoasasample
orsamplefile.Samplesconsistoftheactualwaveform
data,andparametersthatspecifyhowthedatawillbe
playedback,suchasStart,LoopStart,andEnd
Address.Samplescan
beusedinmultisamplesand
drumkits.
TheOASYScanholdamaximumof4,000samplesin
itsinternalmemory.
TheOASYScanshareasinglewaveformamong
multiplesamples.Thisallowsyoutocreatemultiple
sampleswithdifferentplaybackaddressesfromthe
samewaveformwithoutwastinginternalmemory.For
example,
supposethatyouhavewaveformdatathat
recordsavoicesaying“One‐Two‐Three.”Thissingle
pieceofwaveformdatacouldbesharedbythree
samples,withtheplaybackofsampleAproducing
“One‐Two‐Three,”sampleBproducing“One‐Two,”
andsampleCproducing“Two‐Three.”
Formoreinformation,see
“Copy”onpage 681ofthe
ParameterGuide.
ampled digital
aveform
Time
Level
Level
Time
nalog waveform
16 bit
=65,536 leve
of data
48 kHz
= 48,000 times every second
= 0.0208 mS cycle
CD-R/RW Drive Audio Input
(Audio CD)
(Ripping)
ADC
Sample 0000 ... 3999
RAM (memory):
DAC
Insert Effects
(Master Effects)
Disk
Multisample 000 ... 999
AUDIO INPUT jack
Analog/digital
convertor
Analog signal
Analog signal
Digital signal
Used by combinations
and songs
Resampling
Program, combinations and
songs
AUDIO
OUTPUT
jack
RAM (internal memory)
WAVE File
Digital/analog
convertor
Analog signalDigital signal
Program
ConceptualdiagramoftheOpenSamplingSystem
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