Marantz CD 94 CDA 94 Brochure

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maranll®

CD PLAYER D/A CONVERTER

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maranll®

With the partnership of the
00-94 Compact Disc Player
and GOA-94 Digital-to-
Analogue Converter. Marantz
presents true digital audio
equipment for audiophiles.
Equipment dedicated to the
digital audio requirements of
today and tomorrow. Both
incorporate two Merantz
features which add to the
fidelity of the reproduced
sound: 16-bit D/A conversion
with 4 times oversampling,

and optical coupling.

iii-BIT 4 TIMES
OVERSAMPLING

In digital audio SOund reproduction
the digital Signal irom the Compact
DISC (or lrom Digital Audio Tape or
Satellite broadcast) is converted
into a musrc Signal in the digital-to-
arlalogue lD/Ai converter. The
critical pan of the D/A converter. t0r
top quality sound. rs the low-pass
filter. Marantz D/A converters use a
digital litter. unlike many other
converters which use complicated
and problematic nrnth or higher
order analogue tillers.

In the Mararitz litter, the sampling
frequency (which puts the. digital
samples back into their correct time
scale) :5 run at tour times normal
speed - 176.4kHz instead ot
44.1kH2 for Compact Disc
lntermodulatlon distortion (between
the sampling "amend; and the
audio lrequency bandl IS also
pushed up tour times in ireguenoy -
tar away from the audio lreouencres
it could otherwuse diston,

Now. instead of the very sharp
analogue tiller used in other linear
D/A converters lusrng 44,1kHz
sampling) a very gentle 3rd order
Bessel tiller can be used. The result
is Virtually no nnging, which means
Virtually no distortion or phase error.

- - MI
i...

TRANSlENT RESPONSE Or NOlSE RESPONSE OF l6 BIT
16 arr 4 TTMES 4 TIMES 0V? RSAMPUNC
UVERSAMFUNG

NOlSE RESPONSE Of
CONVENYIONA: SYSTEMS

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This technique, known as four times
oversampling, is used in all Marantz
CD players. and the CDA~94 D/A
convener,

iii-BIT DIGITAL-T0-
ANALOGUE CONVERSION

Heweusty Marantz has used a D/A
converter chip which otters lull 16-bit

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TRANSIENY RESfONSE OF
COM/FNTIONA; SYSTEMS

Tl

lMPULSE assmnsr
crwvmnnnm sws was
s .t scans.
resolution in combination wrth a
digital tiller/3rd Order Bessel litter
described above. even though it
was a 14-bit Chip.

A new generation ot lull 16-bit chips
are now being employed wrth the
oversampling and littering
techniques - the Z tiller - which
already mark Marantz CD players
out lrom the rest.

VLSI 5 FOR l6 8 it TIMES OVERSAJFLINC
Dit'iliAl FIJI-"H

The new 16-bit Very Large Scale
Integrated Circurt lVLSI) has tighter
channel balance. an even tlatter
lreouency response rtrve times
tighter than the prevaous
specmcalron). at least SdB more
dynamic range and much imprcwed
drstortron performance.

The 16-bit converters no longer
regurre horseshaprng. A very wrde
dynamic range of tOddB (wrder than
that recorded in the studio!) taster
transrent response and very high
DhaSe linearity is the result,

OPTICAL COUPLING

tn the new arena oi multiple digital
audio sources - now that Digital
Audio Tape and Satellite broadcasts
are about to join Compact Disc -
there is the need lorsignat transter
at the digital level. And the highly
ellicient way to make this transier is
by optical coo ing. Optical
coupling 36 5 digital signals. not
as electric currents, but as light;
from an optml sender. along an
optical fibre cable. to a photodiode
receiver.

The technique has a number of
advantages over conventional
electnml connections using
750nm coaxial cable.

Because of the wide bandwidth.
there is much less transmission
distortion. Signal losses are very
small. and the signals are immune
to electrostatic or electromagnetic
interference A very clean. noise-tree
digital signal arrives at the receiving
an .