m Fully digital signal processing Voicing Equalizer m

m Fully digital signal processing Voicing Equalizer m
m Fully digital signal processing Voicing Equalizer m 40bit floating
point DSP devices m Separate digital filters for Voicing and Equalizer
sections m Wide-format color LCD panel allows direct writing of
response curve with stylus pen m 20 pattern memory m Real-time
spectrum analyzer m Analog connection possible via option boards
Create your ideal listening environment with a stroke of the pen
Digital Voicing Equalizer makes this dream a reality. Separate sound field
compensation (Voicing) and sound field creation (Equalizer) functions
implemented using powerful DSP devices and advanced signal processing
technology. Large, wide-format color display panel allows use of a stylus
pen to directly draw or modify a curve. Connection to analog components
possible using option boards.
What is a "Voicing Equalizer"?
This somewhat unusual term was chosen to symbolize the advanced capabilities
of the DG-38. While this product is a full-fledged high-precision graphic equalizer in
its own right, it also incorporates a sophisticated system for automatic sound field
compensation. It divides the audible frequency range into distinct bands (voices),
and lets the user choose a target response curve that is then expressed (voiced)
by the unit through a process of precise measurement and adjustment steps. The
result is full control over frequency response characteristics at the listening position.
Through creative use of the capabilities offered by the DG-38, the scope of sound
reproduction in the home environment can be significantly enhanced. Get ready to
experience a new dimension of music enjoyment.
When wishing to reproduce high-quality
program sources with optimum fidelity,
the characteristics of the entire
reproduction chain including the speakers
as well as the listening room itself have to
be taken into consideration. The Digital
Voicing Equalizer DG-38 was created with
this fact in mind. It embodies Accuphase's
highly advanced knowledge of digital
signal processing technology for audio
applications. Latest high speed DSP chips
as well as HS-Link input and output
capability make the DG-38 perfectly
suited to handle all high-quality program
sources including SACD.
Functionally, the DG-38 is divided into two
equalizing modules. The first is the
VOICING module designed to provide
sound field compensation, and the
second is the EQUALIZER module that
lets the user creatively and actively shape
the sound field. These central DSP
functions are handled by four 40bit floating
point SHARC processors from Analog
Devices. The
display of the
DG-38 is a
large, wideformat color
LCD that is
configured as a
touch panel. It lets you simply draw a
desired frequency curve with the supplied
stylus pen and immediately hear the
results. Control of other functions is also
easily accomplished with this panel. A
spectrum analyzer function has been
newly incorporated, providing a visual
representation of the spectral content of
any source in real time.
The DG-38 can be connected to other
digital Accuphase components such as
the DP-100/DC-101, DC-330, DP-85, and
DP-77 via the HS-Link interface. Analog
components can be accommodated by
installing suitable analog input/output
option boards.
DG-38 Features
n Fully digital Voicing Equalizer with 40bit floating point
DSP devices for digital signal processing.
n 192 kHz/24 bit input/output interface
n Two equalizing modules: sound field compensation
(VOICING) and sound field creation (EQUALIZER)
n Large, wide-format color LCD panel (154 × 58 mm)
n Touch panel and supplied stylus pen
• Allows direct drawing of response curve on
• Cursor keypad can be called up for pinpoint
operation and touchup
Call up cursor pad to select frequency and adjust level
by moving cursor right and left or up and down.
• Control functions by tapping or dragging symbols
displayed on screen
n 20 memory slots to store entire patterns including
target curve, pre-compensation curve, postcompensation curve, equalizer curve etc. Data sets
can be given a name and called up or modified at
any time.
Call up input panel for character
input or editing
n RS-232 connector for interfacing with a computer
n Sound field measurement microphone AM-28
Supplied stylus pen can be used to draw any
desired response curve.
n Supplied Remote
Commander RC-30
Fig. 1 DG-38 Block Diagram
Controls input selector,
equalizer on/off, memory
recall, memory number
Two main circuit as semblies with four high
speed 40bit floating
point DSP chips, Ultra
Jitter-Free PLL circuit,
tone generator, HSLink en-coder/decoder,
connectors etc.
Sound field compensation (voicing)
Sound field creation (Equalizer)
Because the DG-38 incorporates both measurement and adjustment functions,
accurate sound field compensation can be carried out easily. 68 IIR type
filters with 1/6 octave spacing are used for measuring the sound field, and
the resulting data provide the basis for accurate compensation.
This screen gives access to various functions including microphone setup,
target curve setup, auto compensation, display of frequency response
before and after compensation, and calling up or saving frequency response
When power to the DG-38 is turned on, the Equalizer screen shown here appears.
In this mode, the user can create a desired sound field by drawing a frequency
response curve. This can be done with the supplied stylus pen directly on the
display screen. A cursor keypad is also available, for manually creating the curve
or making adjustments. The values set using this screen are automatically read
and applied by the digital filters.
The DG-38 has four main
operation modes:
"Voicing", "Equalizer",
"Analyzer", and
Four buttons on the front
panel are used to select
the respective mode.
The equalizer filter section uses 74 IIR + FIR hybrid type filters with 1/6 octave
spacing. Because the digital filters for sound field compensation and sound field
creation are separate, equalization can be further modified after the sound field
compensation (voicing) curve has been established.
Spectrum analyzer
The spectral content of the input signal can be displayed on a spectrum
analyzer screen with 1/3 octave spacing, 35 bands, and real-time operation.
This function is entirely separate from the adjustment functions of the unit,
allowing you to monitor peak levels in real time. Comparison of Voicing and
Equalizer on/off condition and checking of right/left frequency distribution
are also possible.
This screen lets you make environment and function settings, such as
selecting the Voicing/Equalizer modes, controlling levels, left/right balance,
screen brightness and contrast, screen data send etc.
Functions are activated directly on the screen with the stylus pen.
Advanced compensation functions
VOICING application examples
The DG-38 automatically measures the sound field and provides accurate compensation based on target characteristics representing
the ideal sound field. Compensation may be performed using ) a preprogrammed standard reference curve, * an automatically
created target curve, or +a freely created curve.
A dedicated sound field measurement microphone with
controlled frequency response is supplied with the
The microphone is a 1/4-inch
type back-electret condenser
type with ultra-thin diaphragm, which assures linear
response over a wide frequency range.
For testing, the DG-38 outputs four warble tones of different frequencies
simultaneously. These are heard as a combined sound.
Setup screen for Voicing level
and channel, microphone settings, etc.
Power amplifier
The internal test signal generator of the DG-38 produces warble tones which are used to drive the speakers via the power
amplifier. The sound travels through the sound field and is picked up by the microphone for sound field measurement.
Ex. 1 Using preprogrammed standard reference
Ex. 2 Compensation with automatically created target
Ex. 3 Compensation with freely created curve
(Creating a curve that incorporates speaker and room
Using the stylus pen, any desired target curve can be
created freely.
First, automatic measurement of characteristics before
compensation is carried out.
m Speaker and room characteristics (Separate measurement
for L, R or simultaneous L/R measurement is possible)
m Individual speaker characteristics
The DG-38 comes with four preprogrammed reference curves:
three curves with high-end rolloff (–1 dB, –2 dB, –3 dB per
octave) and flat response.
Auto generation of
curve for flat response
If flat response was selected for
Auto compensation is performed based on the target
curve. By comparing the characteristics before and after
compensation, the difference can be easily checked
visually as well as aurally.
Based on the measured characteristics before
compensation, a target curve for achieving balanced L/R
response at the listening point is created automatically.
The curve can be further modified on screen to reduce small
peaks and dips.
L/R channael characteristics example for performing sound
field compensation with the "flat" target curve. Peaks and
dips caused by listening room acoustics and speaker
characteristics are evened out, resulting in approximately
flat response.
Auto compensation is performed based on the created
target curve. By harnessing room characteristics and
speaker characteristics, it is possible to counter the
effect of standing waves and achieve well balanced
compensation for the right and left channels.
Ultra Jitter-Free PLL circuit
~Accuphase original digital interface~
The operation of a D/A converter must be synchronized with the input signal.
For this purpose, a phase-locked loop (PLL) circuit generates a master clock
which is used as system reference. In the DG-38, the so-called Ultra JitterFree PLL circuit developed by Accuphase is used.
As shown in the illustration, this circuit consists of a detector for the preamble
component (a kind of start marker for the L/R signal) 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.
HS-Link is an ultra high-quality digital audio interface developed by Accuphase. 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 formats such as 2.8224 MHz/1 bit or 192 kHz/24 bit. Conventional digital
formats are also supported. Because digital audio data are transmitted with utmost
fidelity, the sound quality achieved by HS-Link is simply outstanding.
DAI signal input
HS-Link: High Speed Link
Preamble signal
(pulse distortion removed)
Principle of
Ultra Jitter-Free PLL circuit
Master clock output
HS-Link Block Diagram
Connections between DG-38 and other components
The DG-38 is a Voicing Equalizer with many functions. By incorporating it into an existing audio system,
the entire reproduction chain including the speakers and the listening room can be measured and
optimized to achieve the best possible playback quality.
The DG-38 can be connected to digital components such as the DC-330, DP-85, or DP-77 (with DO2-HS1
installed) via HS-Link. This provides full support for digital signals using various sampling frequencies,
including the DSD signal of SACD sources and 192 kHz/24 bit signals. To connect analog components,
separately available option boards can be installed which incorporate high-quality A ó D converters that
keep signal degradation to an absolute minimum.
n HS-Link, optical, and coaxial digital input/output connectors provided as standard equipment
n Input signal selector menu of DG-38 allows the user to choose HS-Link, optical, coaxial, or installed
option board
n Connection to analog components implemented via option boards
n Up to four option boards can be installed
Option boards that can be used in the DG-38
KAnalog boards
KDigital boards
* The analog input signal is converted to a digital signal by an on-board A/D converter. The
digital output signal is converted to an analog signal by an on-board D/A converter.
Line Input Board
Digital Line Input/Output Board
[Number of slots used: 1]
Balanced Input Board
[Number of slots used: 1]
Provides coaxial and optical
inputs and outputs.
[Number of slots used: 2]
* Conventional high-level input
* Input signal is converted to 24-bit digital signal by on-board
A/D converter.
* Supports sources with sampling
frequencies up to 96 kHz.
* Internal sampling frequency selector should be set to 96 kHz.
KFor balanced connections
KFor unbalanced connections
Balanced Output Board
Line Output Board
HS-Link cable
[Number of slots used: 2]
[Number of slots used: 2]
Serves for transmission of
digital signal corresponding to
the HS-Link interface.
* Conventional high-level output
* On-board high-precision D/A converter supplies analog output
* Shielded twisted pair 8-conductor
OFC cable (TIA/EIA568-A CAT.5)
* D/A converter type: 192 kHz (max.), 24 bit, MDS Plus.
* 3 m, 5 m, 7.5 m, and 10 m cable
lengths are also available.
KFor unbalanced connections
Sound field compensation for all program sources input to DC-330
such as tuner
or CD player
DP-100 or DP-85
transport output,
DP-77 with
DO2-HS1 installed
Audio cable
HS-Link cable
KFor balanced connections
Connection example for use of DC-101 or other DAC
DP-100 or
output, DP-77
with DO2-HS1
HS-Link cable
(supplied with DP-100)
HS-Link cable
HS-Link cable
or DP-85/DP-75V
button on DC-330
to ON for
connection to
installed in
EXT DSP slot
Analog output
Audio cable
Optical fiber cable
installed (1 slot)
Optical fiber cable
Optical fiber cable
75-ohm coaxial
Power amplifier
75-ohm coaxial cable
DIO-OC1 installed
standard equipment in EXT DSP slot
(1 slot)
in DC-101
(2 slots)
(2 slots)
75-ohm coaxial cable
* EXT DSP of DC-101 OFF:
Sound field compensation for DP-100 connected with HS-Link
* EXT DSP of DC-101 ON:
Sound field compensation for source connected with coaxial cable or
optical fiber
Digital component
such as CD transport
Digital component such
as CD transport, DAT or MD recorder
Right speaker
Left speaker
Connection of analog output and digital output to DG-38
SACD transport
Connections to analog components
Example 1:
Example 2:
DG-38 connected to REC/PLAY jacks of RECORDER loop
DG-38 connected between preamplifier and power amplifier (see below)
CD player, tuner, etc. Û Example for connecting the output of a
digital component such as a SACD/CD
transport and the analog output of a
component such as a CD player directly to
the DG-38compensation for source
connected with coaxial cable or optical fiber
Optical fiber cable
Audio cable
CD transport, MD, etc.
75-ohm coaxial cable
HS-Link cable
Audio cable
Audio cable
Input board
For balanced connection:
AI2-B1 (2 slots)
For unbalanced connection: AI2-U1 (1 slot)
Audio cable
Power amplifier
Output board
For balanced connection:
AO2-B1 (2 slots)
For unbalanced connection: AO2-U1 (2 slots)
Input board
For balanced connection:
AI2-B1 (2 slots)
For unbalanced connection: AI2-U1 (1 slot)
Output board
For balanced connection:
AO2-B1 (2 slots)
For unbalanced connection: AO2-U1 (2 slots)
Connection example for multi-amped system with DG-38
Multi-amped system with DG-38 between DC-330 and DF-35
Direct HS-Link connection of DG-38 ð DC-330 ð DF-35 creates
multi-amped system with support for SACD sources.
Multi-amped system to handle all sources input to DC-330
Û When connection to DG-38 is made
via coaxial or optical fiber cable,
sources input to DC-330 with
sampling frequencies up to 96 kHz
are supported.
75-ohm coaxial cable
Û HS-Link connection handles all sources that are input
to the DC-330, including SACD.
Optical fiber cable
HS-Link cable
DIO-OC1 installed in
HS-Link cable
Multi-amped system with analog preamplifier and DG-38/DF-35
Û Output of analog preamplifier is connected to DG-38 for sound field compensation,
and digital output of DG-38 is sent to DF-35.
installed in
DI2-HS1 installed in
EXT DSP slot (2 slots)
* Set EXT DSP button of DC-330 to ON for sound field
compensation of input sources.
* OUTPUTS slot of DC-330 ž DF-35 input
* All connections made with HS-Link cable
Audio cable
Analog output
75-ohm coaxial cable
(2 slots)
Left speaker
Low range
power amplifier
Optical fiber cable
For balanced connection:
AI2-B1 (2 slots)
For unbalanced connection: AI2-U1 (1 slot)
Analog preamplifier
Set switch on board
to 96 kHz
High range Right speaker
power amplifier
Audio cable
Audio cable
Power amplifier
Audio cable
Power amplifier
DIO-OC1 (1 slot)
n Front panel
DG-38 Guaranteed Specifications
[Guaranteed specifications and standard compliance are measured according to EIAJ CPR-2101.]
m Voicing
1/6 octave 68-band IIR filter
Adjustment range ±12 dB
m Equalizer
1/6 octave 74-band hybrid IIR filter + FIR filter
Adjustment range ±12 dB
m Measurement signal
Warble tones
m Frequency Response
Curve Input Principle
Direct drawing with stylus pen or input with cursor keypad
m Spectrum Analyzer
1/3 octave, 35-band real-time type
Display level: +20 dBFs to –100 dBFs (4 ranges, switchable)
m Reproduction Frequency
0.5 - 50.000 Hz +0 –3.0 dB
(For sampling frequency 2.8224 MHz or 192 kHz)
4.0 - 20,000 Hz +0 –0.3 dB
House the supplied stylus pen here
n Rear panel
Option board
expansion slots
Voicing button
Equalizer button
Microphone input jack
Power switch
Analyzer button
Configuration button
H Digital inputs
I Digital outputs
J RS-232 interface
K AC power connector0
0 This product is available in versions for 120/230 V AC. Make sure that the voltage shown
on the rear panel matches the AC line voltage in your area.
0 The shape of the AC inlet and plug of the supplied power cord depends on the voltage rating
and destination country.
0 Microsoft ® and Windows ® are registered trademarks of Microsoft Corporation in the
U.S. and in other countries.
m Gain
+6 to –90 dB, variable
m Digital Inputs
HS-Link Connector type:
Sampling frequency:
m Digital Outputs
HS-Link Connector type: RJ-45 (dedicated HS-Link cable)
EIAJ CP-1201/AES3 compliant
EIAJ CP-1201 compliant
m OS
Microsoft® Windows® CE operating system
m Power Requirements
AC 120 V / 230 V, 50 / 60 Hz
(Voltage as indicated on rear panel)
m Power Consumption
23 watts
m Maximum Dimensions
Width: 475 mm
Height: 150 mm
Depth: 395 mm
m Weight
12.3 kg (27.1 lbs) net
17.3 kg (38.1 lbs) in shipping carton
Stylus pen
Microphone cable
Coaxial digital cable (2)
Remote Commander RC-30
RJ-45 (dedicated HS-Link cable)
EIAJ CP-1201/AES3 compliant
EIAJ CP-1201 compliant
32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz
(16 to 24 bit 2-channel PCM)
[With HS-Link only]
176.4 kHz, 192 kHz (16 - 24 bit 2-channel PCM)
2.8224 MHz (1 bit 2-channel DSP)
Microphone AM-28
Microphone holder
HS-Link connector housing (2)
AC power cord
• Specifications and design subject to change without notice for improvements.
A0305Y PRINTED IN JAPAN 850-0130-00 (AD1)
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