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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 player,
it really consists of a separate transpor t
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 performance aspects have also
been significantly improved. Digital inputs
allow the routing of exter nal digital sources
through the
conver ter 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. [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 conver ters in a
parallel
configuration, resulting in a dramatic
enhancement of precision.
The delta sigma
principle combines oversampling with noise-
shaping (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 conver ters that
are fed the same signal and whose outputs
are combined to arrive at the overall waveform.
In the DP-75V six delta sigma converters are
operated in parallel, resulting in a
performance improvement by a factor of 2.45
(=Ö6). An impor tant charac-teristic of the MDSprinciple 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,
the Ultra Jitter-Free PLL Circuit of the DP-75V
consists of a preamble detector and a voltage-
controlled oscillator (VCO) using a quartz
cr ystal element. The master clock produced
by this PLL circuit is free from the
effects of pulse distor tion and jitter.
Separate processor section with
coaxial and optical input for
digital signals
A digital input allows the user to
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
recorder, MiniDisc recorder, or
other component capable of
recording a digital signal, so the
output of the CD transpor t or the
signal from connected external
sources can be recorded. A direct
connection from
the digital output
of the CD transpor t section
to the
Digital Preamplifier DC-330 is also
possible.
Fig. 1 Block diagram of DP-75V processor
Fig. 2 MDS type D/A converter principle Fig. 3 Ultra jitter-free PLL circuit
Unbalanced
Outputs
Left
Analog
Outputs
1
2
Balanced
Output 3 Pole
Linear
Phase
Low PassFilter
Balanced
Buffer
Option
Slot 1 Digital
Inputs
Option
Slot 3 Option
Slot 2
Coax
RX
Opto
RX
Opto
RX
Opto
RXCoax
CoaxMaster
Clock DAI
Decoder
Ultra
Jitter Free
PLL
Format
Converter Output
Level
Digital
Isolator
MDS 24bit
D/A Conver ter ×6
Opto
RX
Coax
RX
External
DSP
Option
(
DIO-OC1)
Digital
Outputs Digital Filter
Output
Level
Digital Filter
MDS 24bit
D/A Conver ter ×6
Digital
Isolator
Unbalanced
Outputs
Right
Analog
Outputs
1
2
Balanced
Output 3 Pole
Linear
Phase
Low PassFilter
Balanced
Buffer
DS
DS
DP-75V
CD Transport
Section
DAC
#1
#2 S 1 e1 S2
e2
Sn-1
en-1
S0
e0
Sn
en
#1
#
n
MDS
output Digital
inputSignal
Conversion error
VCO
DAI input signal Preamble
detector Preamble signal
(pulse distortion removed)
Phase
comparator Loop
filter
Frequency
divider
Master clock output
(free from jitter and
pulse distortion)
