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Extracted text from Accuphase DP 500 Brochure (Ocr-read)
Page 1
Dedicated high-end CD player for ultimate musical fi delity - New
high-rigidity, high-precision drive mechanism optimized for
CD reproduction. Processor section features MDS
++ type D/A
converter with four parallel DACs. Independent construction of
transport section and digital processor. One set each of coaxial
and optical connectors for digital input and transport output.
The Compact Disc format with its 20-year history offers an unsurpassed wealth of
musical treasures. Audiophiles the world over therefore covet the Accuphase lineup of
high-end dedicated CD players. As the latest entry in this category, the DP-500 features
a CD drive mechanism for the fi rst time developed in house, of course with our famous
dedication to quality and attention to detail. Combine this with the latest digital signal
processing technology, and the result is a breathtaking CD player that will make you
rediscover the joys of music.
The CD mechanism in the DP-500 was developed with a simple yet demanding aim:
extract the information encoded on the CD one-hundred percent. Using all of its
accumulated know-how and expertise, Accuphase has created an extremely rigid and
ultra precise transport mechanism that attains new levels of performance.
The processor section employs four strictly selected high-performance delta-sigma
devices operating in parallel, forming a further refi ned MDS++
D/A
conversion system. The analog fi lter, which has a signifi cant infl uence on
sound quality, is a so-called Direct Balanced Filter that provides totally
separate analog low-pass fi ltering (5-pole Butterworth) for the balanced
and unbalanced signal paths. This brings out the full musical potential of
the CD. The outstanding sound and high performance of the D/A converter
section can be accessed also by external equipment. A set of optical and
coaxial digital inputs accepts digital signals from other components, for
processing with the highest musical accuracy.
Coaxial input
indication
Optical input
indication
Focus Coil
&
Tracking Coil
Optical
Head
Spindle Motor
Sled Motor
Disc Clamp
& Tray Motor
RF Signal
Processor
Spindle
Servo
Controller
Focus & Tracking
Servo Controller
EFM Decoder
& Error
Corrector
Clock
Generator
Master Control
ComputerDisplay
Driver
Infrared Receiver Key
Matrix
From Remote CommanderDisplay
DIGITAL SECTION
Digital Audio
Interface Encoder
Digital Audio
Interface Decoder Coaxial
Transmitter
Optical
Transmitter
Pulse Amp
Optical
ReceiverCoaxial
Optical
Coaxial
Optical Transport
Outputs
Digital
Inputs
ANALOG SECTION
Left
Analog
Outputs
Right
Analog
Outputs
Unbalanced
Balanced
Unbalanced
Balanced 5-Pole
Low-Pass Filter
5-Pole
Low-Pass Filter
5-Pole
Low-Pass Filter
5-Pole
Low-Pass Filter
5-Pole
Low-Pass Filter
5-Pole
Low-Pass Filter MDS++
D/A Conversion
System
MDS++
D/A Conversion
System
Block diagram of DP-500
MDS++
D/A converter
MDS (Multiple Delta Sigma) is a revolutionary design which employs
several delta sigma type converters in a parallel confi guration. In the
combined output of these multiple converters, conversion errors cancel
each other out, resulting in a drastic improvement in all relevant aspects
of converter performance
such as accuracy, S/N
ratio, dynamic range, lin-
earity, and THD. In the
DP-500, four delta sigma
type PCM1796 convert-
ers (made by Texas In-
struments) are driven in
parallel. Compared to a
single converter, this re-
sults in an overall perfor-
mance improvement by a
factor of 2 (= -4).
As shown in the diagram,
the MDS++
features an
enhanced current-to-
voltage (I/V) converter
for processing the D/A
converter output current.
A combination of cur-
rent summing and volt-
age summing is used,
resulting in even better
stability and top-notch
performance. The music
emerges from a totally
silent background, with
breathtaking detail resolution and accurate spatial information.
Signal
Conversion errorNote the ratio between signal
and conversion error. In the
MDS output, the error is very
small in relation to the signal.
(Signal)
Digital
input
MDS type D /A converter principle
MDS output
Block diagram of MDS++
converter in DP-500
(Normal phase
output)
(Reverse phase
output)I (current) /
V (voltage) converter
Current summing Voltage summingSubtractionDAC output (Conversion
error)
Linearity (digital input vs. analog output)
Analog output
LINEARITY
Digital input
Page 2
Transport section features newly developed high-rigidity, high-precision CD drive
In order to extract the minute bits of information from the rapidly
spinning disc and decode these accurately into a digital signal of
high purity, vibrations emanating from the rotating medium as well as
external mechanical vibrations must be minimized. At the same time,
the prevention of resonances is also highly important.
In the DP-500, the CD drive base is mounted fi rmly to a strong metal
frame, forming a highly rigid chassis construction. Conversely, the
traverse mechanism, an integrated structure consisting of the optical
assembly including laser pickup and rotating parts, is designed
for extremely light weight and isolated by a fl oating suspension arrangement from the mechanism base. Specially selected material
is used for viscous damping, supporting the traverse mechanism at
four points.
A large, sturdy bridge-type cover is joined to the mechanism base
for reinforcement. The entire CD drive assembly is directly mounted
to the bottom chassis, which in turn features four large cast iron
insulator feet with superior damping characteristics. The result is a
unit with a low center of gravity and excellent protection against all
kinds of adverse infl uences from vibrations. Perfectly stable and quiet
operation produces a signal of utmost accuracy.
Sturdy chassis absorbs external vibrations
Highly rigid and precise construction
Traverse mechanism with fl oating design and viscous
damping
Integrated design with large bridge joined to mechanism
base
Low center of gravity and effi cient vibration control
High-quality CD tray made of extruded aluminum, plus
quiet and smooth disc loading mechanism
High Carbon cast iron insulator feet with superior
damping characteristics further enhance sound quality
CD transport section features and functions
Fully digital control of CD mechanism
Laser pickup with integrated RF amplifi er for drastically
reduced noise interference
Balanced drive circuitry for actuator control
eliminates interaction with other
circuits
Power-on play feature
allows automatic
playback
Disc trayHigh-rigidity, high-precision dedicated
CD drive
Supplied remote commander RC-100 Provides access to direct play,
input source selection, level
control, repeat play, pro-
gram play and other
functions
.
Traverse mechanismBridge
Mechanism base
Viscous dampers