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Extracted text from Accuphase DG 38 Brochure (Ocr-read)
Call up cursor pad to select frequency and adjust level
by moving cursor right and left or up and down.
Fig. 1 DG-38 Block Diagram
Call up input panel for character
input or editing
Create your ideal listening environment with a stroke of the pen the
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.
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.
What is a "Voicing Equalizer"?
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 AnalogDevices. The
display of the
DG-38 is a
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.Fully digital Voicing Equalizer with 40bit floating point
DSP devices for digital signal processing.
192 kHz/24 bit input/output interface
Two equalizing modules: sound field compensation
(VOICING) and sound field creation (EQUALIZER)
Large, wide-format color LCD panel (154 × 58 mm)
Touch panel and supplied stylus pen
Allows direct drawing of response curve on
Cursor keypad can be called up for pinpoint
operation and touchup
Control functions by tapping or dragging symbols
displayed on screen
20 memory slots to store entire patterns including
target curve, pre-compensation curve, post-
compensation curve, equalizer curve etc. Data sets
can be given a name and called up or modified at
RS-232 connector for interfacing with a computer
Sound field measurement microphone AM-28
Controls input selector,
equalizer on/off, memory
recall, memory number
up/down. Supplied stylus pen can be used to draw any
desired response curve.
Sound field compensation (voicing)
Spectrum analyzerSound field creation (Equalizer)
Two main circuit as-
semblies with four high
speed 40bit floating
point DSP chips, Ultra
Jitter-Free PLL circuit,
tone generator, HS-
The DG-38 has four main
Four buttons on the front
panel are used to select
the respective mode.
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
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.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 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.
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.