Technical description
OVERSAMPLING
TheaudiodataonCDsandDVDsisstoredatasampli ng
rate of44.1 or 48kHz i.e. for each second of m usic 44.100or48.000sampledvaluesareavailablefore ach channel.Inthe DVD 1235 Rtheaudiodatareadfromthe DVD or CD is „multiplied“ to a higher sampling rate (384kHz)beforeitisconvertedbackintoanalogue music signals.Thisprocessdeliversasignificantlybett er,more finelygraduatedsignaltotheconverter,whichcan then beconvertedwithcorrespondinglyhigherprecision.
The DVD 1235 Rprovidestwodifferentalgorithmsforup samplingCDaudiosignals:thestandardFIRfilter andthe short FIR filter. During playback you can switch be tween thematanytimeusingthe button.
TheshortFIRfilterproducesamoreaccuratesigna lpacket, andthereforesoundsslightlymoredynamic.
ThestandardFIRfiltersuppressesbackgroundnoise more effectively, and is primarily recommended for vocal and chambermusic.
The DVD 1235 Rthereforeprovidesameansofmatching the system’s reproduction characteristics to the requirements of the recording and your own personal preferences.
Standard OVS FIR filter
ThelongFIRfilteristhestandardoversamplingpr ocess indigitaltechnology,offeringextremelylinearfr equency response, very high damping, linear phase charac teristicsandconstantgroupdelays.Thedisadvanta geis
thepreandpostechoeswhichareaddedtothesig nal. These „time range errors“ tend to affect the music signal’sdynamics,precisionandnaturalness,andr educe spatialorientation.
OVS 1(short FIRfilter)
Shorteningthefilter(lowercoefficient)reducesth etime rangeerrors,albeitcombinedwithaslightlossof linearity inthefrequencyrangeanddampingperformance.
Frequency response and transient characteristics of the short FIR filter
Frequency response and transient characteristics of the long FIR filter
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