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High-end integrated SA-CD/CD player - High-grade SA-CD/CD
drive combined with exquisite disc tray and ultra-quiet disc loading
mechanism ensures smooth operation. Innovative MDSD (Multiple
Double Speed DSD) digital signal processing circuitry is con gured
as moving average lter for straight D/A conversion. Completely
separate con guration of transport and processor sections, each
equipped with a set of HS-Link, coaxial, and optical connectors.
The reference-level separate-type combo DP-800/
DC-801 and the integrated DP-700 with their exclusive
mechanism developed in-house by Accuphase have
garnered high praise and acclaim the world over. The
new DP-600 is positioned as a companion model to the
DP-700, benefi ting from its sophisticated know-how,
but it is also a high-end integrated SA-CD player in its
own right. Extensive listening tests were conducted
to ensure optimum reproduction quality. As with all
Accuphase players so far, a conscious decision was
made not to support multi-channel formats but rather
focus on obtaining the ultimate in musical fi delity from
two-channel SA-CD music sources.
The high-grade SA-CD drive mechanism in the
DP-600 is the ultimate tool for extracting the
information on SA-CD discs one hundred percent. It
not only keeps internal vibrations of rotating parts to
a minimum, but is also highly impervious to external
vibrations. This ensures that the digital signal remains
in a highly pure and accurate state. A dedicated DSP
chip controls the digital servo, allowing the digital
signal encoded on the SA-CD in DSD (Direct Stream
Digital) format to be processed with utmost accuracy.
The high-speed access mechanism with its single-
lens/twin laser diode combines optimum precision
with lightning-swift operation.
In the digital processor section, ground-breaking
MDSD (Multiple Double Speed DSD) technology
is used, with an ultra-high-speed FPGA (Field
Programmable Gate Array) and multiple DACs driven
in parallel to handle the delayed DSD signal. After D/A
conversion, summation of the multiple data results
in an ingenious moving-average fi lter circuit that
implements straight D/A conversion of the DSD signal.
An important characteristic of MDSD is the use of
MDS++ D/A converters which keep conversion errors
to an absolute minimum. The MDSD circuit acts as a
high-cut fi lter that virtually eliminates high-frequency
quantization noise.
DG-48 connection example
The DG-48 can be connected between the transport outputs and digital inputs
of the DP-600 (using HS-Link, coaxial, or optical connection). This allows sound
field compensation of the signal from the CD transport in the digital domain.
Features and Functions of Transport Section
n High-grade SA-CD/CD drive Highly rigid and precise construction with sturdy, heavyweight chassis to absorb external
vibrations
Traverse Mechanism with fl oating design Massive bridge cover
Non-resonant design and low center of gravity further reduce vibrations
High-quality disc tray extruded
from an aluminum block, plus
super-quiet smooth disc loading
mechanism
n
SA-CD/CD transport outputs
ultra pure digital signal
n Single-lens/twin pickup high-
speed access mechanism
n Support for text data display
n
Accuphases proprietary
digital audio interface HS-
Link (carries both SA-CD and
CD signal)
High-grade SA-CD/CD drive
Bridge
Traverse
mechanism
Disc tray Mechanism
base
DP-600 Block DiagramHS-Link Block Diagram
Viscous dampers
HS-Link cable
HS-Link: Supports transmission of both SA-CD and CD signals
Coaxial/optical fi ber: CD signals only
Accuphase Exclusive Digital Interface HS-Link: High Speed Link
HS-Link is an ultra high-quality digital audio interface
developed by Accuphase using latest digital signal
transmission technology. It supports send/receive
verifi cation for copyright protection. The LVDS (Low Voltage
Differential Signaling) principle allows a single dedicated
HS-Link cable to transmit all audio data with utmost fi delity,
including 2.8224 MHz/1-bit and 192 kHz/24-bit signals.
Digital
Inputs
HS-Link
Coaxial
Optical HS-Link
Decoder
Coaxial
Receiver
Optical
Receiver
Interface
Decoder
VolumeVolume
Up-sampler
Up-samplerDelay Delay
Delay Delay
D/A Conversion D/A Conversion
Motor
&
DriverCD
Optical
Head SA-CD
Optical
HeadDigital
Signal
Processor
RF
Signal
Processor
Digital
Servo
ProcessorInfrared
Receiver
Key
MatrixOptical
TransmitterCoaxial
Transmitter Clock
Generator
Master
Control
Computer Digital Audio
Interface
Encoder
DisplayLV D S
Driver/
Receiver
HS-Link
Coaxial
Optical
Transport
Outputs
Left
Analog
Outputs
Right
Analog
Outputs
5-Pole
Butterworth
Low-Pass Filter
5-Pole
Butterworth
Low-Pass Filter
5-Pole
Butterworth
Low-Pass Filter
5-Pole
Butterworth
Low-Pass Filter
5-Pole
Butterworth
Low-Pass Filter
5-Pole
Butterworth
Low-Pass Filter
Unbalanced
UnbalancedBalanced
Balanced Digital
Audio
SignalTIA/EIA-644
LV D S
Driver/Receiver
HS-Link
Encoder
Security
ControlRJ-45
Connector
RJ-45
ConnectorHS-Link
Decoder
Security
Control
TIA/EIA-568A CAT.5
STRAIGHT CABLE
TIA/EIA-644
LV D S
Driver/ReceiverDigital
Audio
Signal
From
Remote Commander
MDSD (Multiple Double Speed DSD) System
MDSD (Multiple Double Speed DSD) System
PCM Signal PCM Signal DSD Signal
DSD Signal
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n Supplied remote commander
RC-100
Gives access to various functions
including direct play, repeat, pro-
gram play, input switching,
and level control.
Innovative Digital Signal Processing: MDSD (Multiple Double Speed DSD)
Digital Input
DSD signal
mReduces noise during volume processingm Shifts the effective fi lter frequency upwards
Digital volume processing
Volume Upsampler
×2 2.822 MHz/1-bit 5.6448 MHz/1-bit
5.6448 MHz/1-bit
Delay
Device
Delay
Device
Delay
Device
Delay
Device
Delay
Device Delayed by
1 clock cycle
Normal Phase
Output
Reverse Phase
Output
Moving-Average Filter Circuit
DAC output
Linearity
(Digital input vs. analog output)
I (Current) - V (Voltage)
Converter
The DSD signal from the input is upsampled by a factor of 2,
resulting in a sampling frequency of 5.6448 MHz/1-bit.
After volume processing, the circuit performs D/A conversion
using a highly ingenious moving-average fi lter principle.
In the DP-600, this involves five delay devices and six
MDS++ type D/A converters. The signal is delayed (shifted)
progressively by one clock cycle to produce six signals which
are sent to separate D/A converters for direct D/A conversion.
The converted signals are then summed.
Since conversion errors are kept to an absolute minimum
by the use of MDS++ type DACs, the MDSD principle
results in a 6-pole high-cut fi lter with perfectly linear phase
characteristics.
MDS++ D/A Conversion System
Current
SummingVoltage
Summing
Digital Input (dB) Analog output (dB)