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Extracted text from Accuphase DP 78 Brochure (Ocr-read)
Page 1
An SA-CD/CD player of the highest order - Processor section supports high-
quality formats such as 2.8224 MHz/1-bit and 192 kHz/24-bit. Further improved
MDS++ D/A converter. Transport section features dedicated DSP for digital
servo and single lens/twin pickup high-speed access mechanism. Separate
construction of transport and processor sections and respective connectors allow
independent use. HS-Link input/output boards available as option.
The Accuphase separate type player combo DP-100 and
DC-101 incorporating HS-Link connectivity is recognized
both in Japan and overseas as the ultimate setup for
SA-CD playback. It is the standard against which all others
have to be measured. And now, the superior technological
know-how gained through the development of this combo
has found another manifestation in the integrated SA-CD/
CD player DP-78. Incorporating the latest advances in
digital technology, the DP-78 is destined to take its place
at the top of its class. By concentrating solely on two-
channel sources both in the SA-CD and CD format, the
DP-78 lets you fully enjoy the best that orthodox music
reproduction has to offer.
Ever since its introduction in 1999, the SA-CD catalog of
hybrid discs has been expanding. With its 2.8224 MHz/
1-bit format, the SA-CD stores four times as much
information as a conventional CD at 44.1 kHz/16-bit. This
allows it to realize dramatically superior physical
performance as manifested by wider frequency response
and dynamic range. The DP-78 is equipped to make full
use of this impressive potential. It will let you rediscover
the deep joy and satisfaction that a truly outstanding
musical experience can offer. But the DP-78 not only
handles the SA-CD format with impeccable finesse, it will
bring out the best from conventional CD sources as well.
Be prepared for a wholly new encounter with your entire
musical catalog.
The SA-CD/CD transport section and the processor
section of the DP-78 are kept entirely independent of each
other, to achieve optimum performance in each regard.
The transport features a single lens/twin pickup high-speed
access mechanism, combined with a digital servo
controlled by its own DSP. This advanced approach
assures highly accurate processing of the digital signal
and excellent support for high-sampling-frequency sources
including 2.8224 MHz/1-bit and 192 kHz/24-bit. The
DAC - a key component for determining sound quality -
incorporates a further refined version of the acclaimed
MDS principle, called MDS++. As a result of this non-holds-
barred approach, the DP-78 projects a sound stage of
unprecedented realism and sheer musical perfection.
Digital
Audio
Signal
Digital
Audio
Signal TIA/EIA-644
LVDS
Driver/Receiver
TIA/EIA-644
LVDS
Driver/Receiver
Security
Control RJ-45
Connector
RJ-45
Connector Security
Control
HS-Link
Decoder
HS-Link
Encoder
SA-CD / CD
CD
Optical
Head
Motor
&
DriverDigital
Signal
ProcessorCP-1201
EncoderCP-1201
Driver
RF
Signal
Processor DSPΓ2
Digital
Servo
ProcessorClock
Generator
Infrared
ReceiverKey
Matrix
Display Master
Control
Computer
Option 1
Option 2 Linear Phase
Low-Pass
Filter
Linear Phase
Low-Pass
Filter Ultra
Jitter-Free
PLL
Interface
DecoderOptical Coaxial
OpticalCoaxialUnbalanced
Balanced
Unbalanced
Balanced
Digital
Inputs
Option
SlotsLeft
Analog
Outputs
SA- CD
Optical
Head
Transport
Outputs
Right
Analog
Outputs
DAC DACΓ6
D/A Conversion System
Buffer
Buffer DAC DACΓ6
MDS ++
D/A Conversion System MDS ++
TIA/EIA-568A CAT.5
STRAIGHT CABLE
High
Low DC-330 DF-45
DP-78
nDigital servo with dedicated DSP assures highly accurate signal pickup for SA-CDs and CDs
nPlays also regular CDs with outstanding quality
nSingle lens/twin pickup mechanism minimizes access time
nSupport for text data display including disc title and artist name information
nStrong, precision-machined chassis with resonance and vibration resistant construction
nSA-CD/CD transport output via optional HS-Link Output Board DO2-HS1 (see connection example
below)
SA-CD/CD Transport Section Features and Functions
nHigh Carbon cast iron insulator feet with
superior damping characteristics further
enhance sound quality
nMulti-function remote commander
RC-100 supplied as standard equipment
nDedicated coaxial and optical connectors
for CD signal output
`Assembly with master
clock generator, DAI
encoder/decoder, ul-
tra jitter-free PLL cir-
cuit, and other digital
signal processing cir-
cuitry
Transport section outputs
Accuphase Original Digital Interface
HS-Link: High Speed Link
Digital connection for multi-amped system
Using HS-Link, it is possible to keep the connection of DP-78 Ε
DC-330 Ε DF-45 entirely in the digital domain until directly before
the power amplifier. The various components are connected with
HS-Link cable.
DO2-HS1
installed
DI2-HS1
installedDO2-HS1 installed in
OUTPUTS slotFor 5-way con-
figuration and
higher: to addi-
tional DF-45Analog output
(2-way configuration) HS-Link cable
HS-Link cable
Power amplifier
Power amplifier
Connection example for effective use of SA-CD/CD transport
DP-78 Block DiagramHS-Link Block Diagram
HS-Link is an ultra high-quality digital audio interface developed by
Accuphase using the latest digital signal transmission technology. It
supports send/receive verification for copyright protection. The LVDS
(Low Voltage Differential Signaling) principle allows a single dedicated
HS-Link cable to transmit signals using advanced digital audio formats
such as 2.8224 MHz/1-bit or 192 kHz/24-bit. Because digital audio
data are transmitted with utmost fidelity, the sound quality achieved
by HS-Link is outstanding.
Page 2
Other Functions and Features
DAC 1
DAC 2
DAC 3
DAC 4
DAC 5
DAC 6
S1
e1 S2
e2
Sn-1
en-1
S0 (Signal)
e0
Sn
en
DAC
#1
DAC
#n-1
DAC #2
DAC
#n
-140-140-130-120-110-100-90-80-70-60-50-40-30-20-100
-120 -100-90-80-70 -50-40-30-20-10 0
Analog Output
Digital Input [dB]
[dB] LINEARITY
(Conversion
error)
(Normal phase output)
(Reverse phase output) I (current)/V (voltage)
converter
Current adder Voltage adderSubtraction DAC output
(Normal phase output)
(Reverse phase output)
Further Refined MDS++ D/A Converter
The output signal is produced by an MDS++ Type D/A converter which
boasts ultimate performance and impeccable sound quality. MDS
(Multiple Delta Sigma) is a revolutionary design which employs several
delta sigma type converters in a parallel configuration for greatly
improved accuracy.
As is evident from the illustration, combining the output signal from
individual converters causes mutual cancellation of conversion errors,
resulting in a notable improvement in all relevant aspects of conversion
performance: accuracy, S/N ratio, dynamic range, linearity, and THD.The DP-78 uses six Analog Devices AD1955 delta sigma converters
in parallel, which affords an overall performance improvement by a
factor of 2.4 (-6).
The MDS++ type converter in the DP-78 (block diagram shown below)
features improved operation of the I-V (current-to-voltage) circuit and
uses a combination of current adding and voltage adding, to reduce
the load on the current adder. This results in better stability and further
improved performance. Music emerges from a totally silent background
and is reproduced with incredibly accurate spatial imaging.
Digital
inputSignal
Note the ratio between signal
and conversion error. In the
MDS output, the error is very
small in relation to the signal.
MDS output
Conversion error
Delta sigma type D/A converter
n nn n
n Block diagram of MDS++ converter
n nn n
nSupplied remote commander RC-100
Functions include input switching, output
level adjustment, direct play, repeat,
program, shuffle, etc.
n nn n
nMDS type
D/A converter
principleLinearity
(Digital input vs. analog output)