Accuphase DP 65 V Brochure

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MMB COMPACT DISC PLAYER

DP- 65 V

0 Totally separate CD transport and processor sections 0 MMB type D/A
converter assures amazing conversion precision 0 Two sets of digital inputs
and outputs .Jitter-tree highrpertormance digital demodulator 0 Option
board slots allow adding digital Inputs and Outputs 0 Fully digital control of
CD mechanism 0 Balanced actuator drive circuttry

COMPACT

DIGITAL Auniu

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The DP-65V may look like a conventional Compact
Disc player from the outside, but it really consists
of an entirely separate transport section and digital
processor combined in one unit.This product fully
reflects Accuphase's extensive experience with
high-class separate components for CD
reproduction.

The D/A converter in the processor section
features the high-precision MMB principle
developed by Accuphase. Four D/A converters
selected according to strict sound quality criteria
are connected in parallel, resulting in dramatically
improved linearity, THD, dynamic range, and
signal-to-noise ratio. Digital inputs allow use of this
ultimate D/A conversion system also with external
components. Since a digital output carrying the
signal from the CD transport is also provided. the
Digital Voicing Equalizer DG-28 can be easily
inserted into the signal path.

The CD transport side of
the DP-65V is
impressive as well. For
example, it uses fully
digital circuits for
mechanism control.This
allows optimizing servo
performance for each
individual disc. assuring improved operation
stability and a drastic reduction in error rate. The
laser pickup Is an ultra-compact type with
integrated RF amplifier, and all actuators are driven
by balanced circuits which do not conduct any
current to the ground line. The tray lock feature
firmly secures the tray during playback, eliminating
mechanical resonances. which maintains the high
purity of the digital signal.

The digital output makes it easy to directly supply
the digital Signal from the CD transport to the
Digital Preamplifier DCBOO. Other possible
applications include connection of a digital
recorder such as a DAT or MD unit. for direct
recording of the signal in the digital domain. Option
board slots on the rear panel (compatible with the
range of boards available for the DC-300 and DG-
28) allow increasing the number of inputs and
outputs, to accommodate a variety of components.

Display example for processor

[Digital Processor Section]

MMB Type DIA Converter Achieves 20-Bit
Linearity and Ultra Low Noise

The D/A converter uses the amazing MMB
(Multiple Multi-Bit) principle which delivers
performance and sound quality previously thought
unattainable it consists of four strictly selected 20-
bit D/A converters connected in parallel. This
revolutionary approach yields a dramatic
improvement in every important performance
aspect.

As can be seen from the illustration, the high-
speed output of an 8«times oversampling digital
filter is connected in parallel to the individual
converters Immediately after D/A conversion, the
output of the converters is combined while still in
high-speed form. But ratherthan simply linking the

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converter elements in parallel, the MMB circuit
drives each converter separately. so that it can
develop its full potential. Special attention was
devoted to phase response at high trequencres.
Parts selection, layout and wiring patterns were
optimized to achieve perfect phase matchingThe
end result is performance which sets new
standards regarding linearity and absence of
distortion and noise.

An important characteristic of the MMB principle
is the fact that it improves performance regardless
of signal level and frequency. The converter

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therefore maintains excellent linearity even at
extremely low levels that present insurmountable
problems for conventional converter designs.The
audible advantages are immediately apparent as
more precise localization of sound sources and a
heightened sense of space and ambience. As
illustrated by the performance chart, linearity of
digital input vs analog output is maintained from
the highest signal level down to minute levels as
low as -110 dB (the theoretical limit of 16-bit CD
sources is -96 dB).

Totally Separate Processor Section With
Coaxial and Optical Input for Digital Signals

A digital input allows the user
to enjoy the top~leve|
performance of the processor Wm.
section also with other
components that can supply
a digital signal, such as
another CD transport unit.
DAT recorder. MiniDisc DigIIaIInPulcomecmrs

Integrated CD player features totally separate CD transport and processor
section. MMB type D/A converter assures amazing conversion precision.
Fully digital control of CD mechanism allows real-time optimization of
servo parameters. Two sets of coaxial and optical digital inputs and outputs
plus option board slots provide total flexibility.

recorder etc. For utmost flexibility, the input can
handle both optical and coaxial connections.
Internal processing of audio data is designed to
manage all data from these inputs in 24-bit format.

Jitter-Free High-Performance Digital
Demodulator

Demodulation of the digital signal is carried out by a
058412 chip (made by Crystal Semiconductor).This
device not only has extremely low inherent jitter. it
also is capable of absorbing any jitter components
present in the input signal. Since the chip can handle
digital signals up
to a width of 24
bits. the advanta-
ges of the MMB
principle are
realized with any
type of program
source.

ZD-Bit. B-Times Oversampling Digital Filter
The purpose of a digital filter is to multiply the
sampling frequency by an integer, thereby moving
any spurious noise components far outside the
audible range.

The filter in the DP-65V is manufactured by NPC
and offers statevot-the-art characteristics in all vital
aspects, such as absence of group delay, passband
ripple, and
attenuation. The
filter approaches
the theoretical
limits of perfor-
mance. The
d e e m p h a s i s
stage features an HR (Infinite Impulse Response)
design to assure precise gain and phase
characteristics.

d-Pole Analog Filter With Hand-Selected
Components

To reduce noise in the upper frequency range and
achieve high S/N ratio. a 4-pole Buttenrvorth design
is used for analog filtering. The cutoff frequency
point is optimized to keep phase shifts in the
passband range at an absolute minimum. Strict
selection of all filter components assures sonic
purity and total musical accuracy.

| Level Control Prevents Sound Quality
Deterioration
The 20-bit MMB D/A converter in the DP-65V has
a 4~bit margin, which allows precise level
attenuation down to -40 dB without any loss in
signal quality.

Provisions for Direct Connection of Digital
Voicing Equalizer DG-28

Because the CD transport section and digital
processor section in the DP-65V are entirely
separate, the DIGITAL Voicing Equalizer DG>28
can be inserted into the signal path, to allow sound
field control of the signal entirely in the digital
domain.