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Extracted text from Accuphase DP 77 Brochure (Ocr-read)
Page 1
SACD/CD Transport Section Features and Functions
Connection examples for effective use of SACD/CD transport
~Accuphase Original Digital Interface~
HS-Link: High Speed Link
DP-77 Block DiagramHS-Link Block Diagram
Connection to DC-300 for SACD/CD playback and digital
connection to DG-28 for sound field compensation
Digital connection to DC-330, DF-35 for multi-amped system
Coaxial digital
cableHS-Link cable
Coaxial digital
cable
HS-Link cable HS-Link cable
Assembly with transport outputs and digital inputs (optical,
coaxial)
HS-Link Output Board DO2-HS1 installed in DP-77
Rediscover what the Compact Disc is all about Integrated SACD/CD
player with MDS Plus type D/A converter. Transport section features single
lens/twin pickup high-speed access mechanism. Processor handles latest
formats such as 2.8224 MHz/1-bit and 192 kHz/24-bit. Separate construction
of transport and processor sections and respective connectors allow
independent use. HS-Link input/output board available as option.
The integrated SACD/CD player DP-77 is
based on the superior know-how gained
through the development of the separate type
player combo DP-100 and DC-101, using the
latest advances in digital technology. This
player lets you fully enjoy the wide frequency
range and amazing dynamics of the SACD
format. But the DP-77 also brings out hidden
musical qualities inherent in conventional CDs,
letting you hear even familiar recordings like
you've never heard them before.
The transport section of the DP-77 features a
dedicated DSP for the digital servo circuitry,
assuring highly precise processing of the digitalSACD signal recorded according to the DSD
principle. The highly critical laser pickup section
features a single lens/twin pickup high-speed
access mechanism to achieve totally accurate
signal readout. The processor section uses
the latest in sophisticated digital technology to
provide support also for 2.8224 MHz/1-bit and
192 kHz/24-bit sources. The D/A converter
section which has a crucial effect on sound
quality employs the MDS Plus principle, with
multiple strictly selected Delta Sigma
converters in a parallel configuration, assuring
unprecedented conversion precision.
The SACD/CD transport section and theprocessor section of the DP-77 are kept
entirely independent of each other, to achieve
optimum performance in each regard. This
manifests itself in utterly authoritative sound.
Thanks to transport outputs and digital
processor inputs, the two sections can be used
separately as well.
An optional HS-Link Board is available for
combination with the DC-330/DP-100 or for
high-quality sound field compensation with the
DG-28/DG-38, including wide-range sources.
Even multi-amping with the DF-35 is possible,
opening up a whole world of high-class audio
possibilities.
Digital servo with dedicated DSP assures
highly accurate signal pickup for SACD and
CD
Plays also regular CDs with impressive quality
Single lens/twin pickup mechanism mini-
mizes access time
Strong, precision-machined chassis with
resonance and vibration resistant
construction
"High Carbon" cast iron insulator feet with
superior damping characteristics further
enhance sound quality
Multi-function remote commander RC-28
supplied as standard equipment
Optional HS-Link output board for SACD/CD
transport section
Dedicated coaxial and optical connector for
CD signal output
The DP-77 provides output facilities of the
SACD/CD transport section to allow flexible
combinations. By installing an HS-Link
option board, the unit can be used with a
DC-330 for SACD/CD playback. From the
DC-330, the digital signal can be further
routed to the Voicing Equalizer DG-28/
DG-38, the Channel Divider DF-35, etc.
This offers a host of possibilities for
creating a multi-amplified system entirely
in the digital domain.
HS-Link is an ultra high-quality digital audio interface developed
by Accuphase using 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 simply outstanding.
Power amplifierPower amplifier
Power amplifier
Because DG-38 incorporates HS-Link,
direct connection with a HS-Link cable
is possible.
DI2-HS1
installedDIO2-DG1 installed in EXT DSP
slot (uses 2 slots)Analog output
DI2-HS1
installedDO2-HS1 installed in
OUTPUTS slotDI2-HS1 installedAnalog output (2-way
configuration) Using HS-Link, it is possible to keep the connection of
entirely in
the digital domain until directly before the power amplifier. The various components are
connected with HS-Link cable.
For 5-way con-
figuration and
higher: add-
itional DF-35
Page 2
Digital Processor Section Features and Functions
Ultra Jitter-Free PLL Circuit
[MDS Plus Type] D/A Converter
Supplied remote
commander RC-28
Functions include input
switching, output level
adjustment, direct play,
repeat, program, shuffle,
etc.Assembly with master clock generator,
DAI encoder/decoder, ultra jitter-free PLL
circuit, and other digital signal processing
circuits
Digital processor supports new generation formats with
high sampling rates such as 2.8224 MHz/1-bit and
192 kHz/24-bit
MDS Plus type D/A converter achieves stunning
performance and sound quality
Ultra jitter-free PLL circuit topology totally eliminates
pulse distortion
Fully separate processor section with coaxial and
optical digital inputs
Ultra high-speed digital coupler ensures effective
separation between digital and analog sections
Digital level control with adjustment range 0 dB to
-“60 dB
Balanced and unbalanced analog outputs
MDS (Multiple Delta Sigma) is a revolutionary design
which employs several delta sigma type converters
in a parallel configuration.
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:
accuracy, S/N ratio,
dynamic range, linearity, THD, etc.
In the MDS Plus type converter employed in the
DP-77, this principle has been further refined by
enhancing the current-to-voltage converter in the
signal adder section for even better stability and
top-notch performance.
The DP-77 uses four delta sigma converters inparallel, which results in an overall performance
improvement by a factor of 2 (= 4)
Assembly with MDS Plus D/A converter, analog
outputs, etc.
This original Accuphase development
employs a phase-locked loop (PLL)
circuit to extract a highly precise
master clock from the input signal to
be used as reference for D/A
conversion.
As shown in the diagram, the circuit
consists of a preamble detector and
a voltage-controlled oscillator (VCO)
using a quartz crystal element. The
master clock produced by this PLL
circuit is totally free from the effects
of pulse distortion and jitter.
MDS Plus type D/A converter principle
Note the ratio of signal level vs. conversion
error level: in the MSD output, the
conversion error is much smaller in relation
to the signal level. Digital
inputConversion error
(Signal)
MDS output Signal
(Conversion
error)DAI input signalPreamble
detector Preamble signal
(pulse distortion removed)
Phase
comparatorLoop
filter
Master clock
output Frequency
divider
Principle of ultra jitter-free PLL circuit