Accuphase DP-75-V Brochure
PRECISION COMPACT DISC PLAYER
DP-75V
m Separate CD transport and processor sections m MDS type D/A
converter assures phenomenal conversion precision
m Compatib le with next-generation digital sources m Ultra jitter-free
PLL circuit topology m Two sets of digital inputs and outputs m Option
board slots allow adding digital input and output boards m Fully digital
control of CD mechanism m Balanced actuator drive circuitry
A new-generation CD player that reproduces even the most subtle musical
details Revolutionary MDS (Multiple Delta Sigma) converter with 24-bit
ultra high precision. Separate CD transport and processor sections. Ready
for handling input from new-generation digital sources such as SACD and
DVD-Audio. Fully digital control of CD mechanism.
The DP-75V incorporates the latest advances
in digital technology . Processing performance
was upgraded to handle the new generation
of super high resolution audio sources such
as SACD and DVD-Audio. Enhanced sound
quality is also available with existing CDs.
Although the DP-75V may look like a
conventional integrated Compact Disc play er,
it really consists of a separate transport
section and a digital processor each of which
can be used on its own.
The processor features a revolutionary MDS
(Multiple Delta Sigma) converter with superb
24-bit precision. This ensures ultra low
distortion and outstanding signal-to-noise
ratio. All other perf ormance aspects have also
been significantly improved. Digital inputs
allow the routing of external digital sources
through the
converter of the
DP-75V, for
playback of any
format source
with exceptional sound quality. To ensure
future upgradability , the unit has option board
slots that support the ADB 2 (Accuphase
Digital Bus 2) interface which accommodates
next-generation formats such as SACD and
DVD-Audio. The EXT DSP option board slot
allows connection of the DG-28 Digital
Equalizer for sound field compensation in the
digital domain.
The simple, refined design of the DP-75V
complements its technological prowess. The
overall result is music reproduction of such
clarity and detail definition that you will
discover a whole new dimension of enjoyment
even in long-familiar CDs.
Coax
Digital
Inputs
Digital
Outputs
Option
Slot 1
Option
Slot 2
Option
Slot 3
External
DSP
Option
(
DIO-OC1
RX
Opto
RX
Coax
RX
Opto
RX
Coax
Opto
RX
Coax
)
Opto
RX
DP-75V
CD Transport
Section
DAI
Decoder
Fig. 1 Block diagram of DP-75V processor
[Digital Processor Section]
Innovative MDS (Multiple Delta Sigma)
converter reduces distortion to theoretical
limits and assures outstanding S/N ratio
The output signal is generated by a newly
developed D/A converter
that provides
excellent performance and sound quality . The
MDS (Multiple Delta Sigma) principle employs
several delta sigma type converters in a
configuration, resulting in a dramatic
parallel
enhancement of precision.
The delta sigma
principle combines oversampling with noiseshaping (a kind of digital feedback) to project
the amplitude information of the digital signal
onto a time axis for precise conversion. Figure
2 shows several delta sigma converters that
are fed the same signal and whose outputs
are combined to arrive at the overall wav eform.
Signal
Conversion error
1
S
e
1
S
2
e
2
Sn-
1
en-
1
S
n
e
n
Digital
input
DAC
#1
#2
#1
n
#
Fig. 2 MDS type D/A converter principle
In the DP-75V six delta sigma converters are
operated in parallel, resulting in a
performance improvement by a f actor of 2.45
(=√6). An important charac-teristic of the MDS
MDS 24bit
D/A Converter ×6
Digital
Isolator
∆Σ
Digital Filter
Output
Level
MDS 24bit
D/A Converter ×6
∆Σ
Digital Filter
Output
Level
Ultra
Jitter Free
PLL
Master
Clock
Format
Converter
Digital
Isolator
3 Pole
Linear
Phase
Low Pass
Filter
3 Pole
Linear
Phase
Low Pass
Filter
MDS
output
S
e
Balanced
Buffer
Balanced
Buffer
0
0
principle is that the
performance benefits
are achieved
regardless of signal
frequency and signal
level. Thus noise at
very low signal levels, that was difficult to
contain with conventional delta sigma
converters, can now be drastically reduced.
The audible result is music reproduction
emerging from complete silence with an
impressive sense of clarity and nuance.
Ultra jitter-free PLL circuit
For synchronizing the operation of the D/A
converter with the digital audio interface (DAI),
a phase-locked loop (PLL) circuit is used
which generates a master clock to be used
as a system reference. As shown in Figure 3,
DAI input signal
Preamble
Preamble signal
detector
(pulse distortion removed)
Phase
comparator
Frequency
divider
Loop
filter
VCO
Fig. 3 Ultra jitter-free PLL cir cuit
the Ultra Jitter-Free PLL Circuit of the DP-75V
consists of a preamble detector and a voltagecontrolled oscillator (VCO) using a quartz
crystal element. The master clock produced
by this PLL circuit is free from the
effects of pulse distortion and jitter.
Unbalanced
Outputs
1
2
Left
Analog
Outputs
Separate processor section with
coaxial and optical input for
digital signals
A digital input allows the user to
Balanced
Output
enjoy the top-level performance of
the processor section with other
components that can supply a
digital signal. In addition, a digital
output lets the user connect a DAT
Unbalanced
Outputs
Balanced
Output
1
2
Right
Analog
Outputs
recorder, MiniDisc recorder, or
other component capable of
recording a digital signal, so the
output of the CD transport or the
signal from connected external
sources can be recorded. A direct
connection from
of the CD transport section
Digital Preamplifier DC-330 is also
possible.
Master clock output
(free from jitter and
pulse distortion)
the digital output
to the
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