Accuphase DP-500 Brochure
m Newly developed high-rigidity, high-precision CD drive m MDS++
type D/A converter m Jitter-free high-performance digital demodulator
m Direct Balanced Filter with separate analog low-pass fi ltering for
balanced and unbalanced signal paths m Two sets of digital inputs
m Two sets of transport outputs m Fully digital control of CD mechanism
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
Coaxial input
indication
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.
Focus Coil
&
Tracking Coil
Optical
Head
Spindle Motor
Sled Motor
Disc Clamp
& Tray Motor
Digital Audio
Interface Encoder
Digital Audio
Interface Decoder
++
MDS
D/A Conversion
System
RF Signal
Processor
Spindle
Servo
Controller
Focus & Tracking
Servo Controller
Master Control
Computer
Key
Matrix
From Remote Commander
EFM Decoder
& Error
Corrector
Display
Driver
Infrared Receiver
Transmitter
Transmitter
Pulse Amp
5-Pole
Low-Pass Filter
5-Pole
Low-Pass Filter
5-Pole
Low-Pass Filter
Coaxial
Optical
Optical
Receiver
Clock
Generator
Display
Optical input
indication
DIGITAL SECTION
Coaxial
Optical
Coaxial
Optical
ANALOG SECTION
Unbalanced
Balanced
Transport
Outputs
Digital
Inputs
Left
Analog
Outputs
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, linearity, and THD. In the
DP-500, four delta sigma
type PCM1796 converters (made by Texas Instruments) are driven in
parallel. Compared to a
single converter, this results in an overall performance improvement by a
factor of 2 (= √4).
As shown in the diagram,
the MDS++ features an
enhanced current-tovoltage (I/V) converter
for processing the D/A
converter output current.
A combination of current summing and voltage 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.
Digital
input
(Normal phase
output)
(Reverse phase
output)
Analog output
LINEARITY
Linearity (digital input vs. analog output)
Signal
Conversion error
Note the ratio between signal
and conversion error. In the
MDS output, the error is very
small in relation to the signal.
MDS type D/ A conver ter principle
I (current) /
V (voltage) converter
(Signal)
(Conversion
error)
MDS output
Digital input
DAC output
++
MDS
D/A Conversion
System
5-Pole
Low-Pass Filter
5-Pole
Low-Pass Filter
5-Pole
Low-Pass Filter
Block diagram of DP-500
Unbalanced
Balanced
Right
Analog
Outputs
Subtraction
Current summing Voltage summing
Block diagram of M DS++ converter in DP-50 0
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