|270,000 yen(March, 1990 release)
CD player which introduced the technology cultivated by DP-80 L/direct
current-81L, and was developed.
An IC type 18-bit D/A converter is
selected carefully and adopted as a D/A converter.
Since bit accuracy can be adjusted in order that this converter may improve the engine performance to a
limit, taking advantage of this advantage, all the products were adjusted in the
product line, and the marginal engine performance has been realized.
emphasis on realizing accuracy of 18 bits completely, the stability and
long-term stability over environmental change of temperature etc. are
investigated thoroughly, and it is endeavoring pulling out the marginal engine
The oversampling digital filter is adopted as a digital
filter 8 times, and the amount of attenuation for 24.1-328.7kHz is oppressed on
the level of -110dB.
Moreover, pass band Rippl leading to sound quality
degradation is less than ±0.00005dB, and has become a filter of that time
In the audio low pass filter, it constituted from a 3rd
discrete GIC Butterworth active filter which selected the element carefully, and
sound quality serious consideration is designed.
A digital signal part and analog circuitry are electrically separated by
It is an ultra high-speed type with 40 Mbit/sec throughput, and dissociates
completely electrically, using this four per channel, and the optocoupler
is performing faithful signal transmission by light.
Furthermore, in order to prevent a noise invading
through a power-source part, the power transformer of digital one and analog
circuitry is made to become independent, respectively, and is considered as 2
transformer composition. In order to raise the audio characteristic, the winding
wire of the analog transformer is right-and-left independence.
order to prevent a high frequency noise ingredient's interfering in static
electricity through space, and interfering as electromagnetism, each circuit is
completely shielded on the thick metal plate.
The linear motor mechanism
is adopted as the tracking of a laser pickup.
It controls by the 8-bit
microprocessor developed for exclusive use, and smooth song selection is enabled
at the speed for about 1 second.
Moreover, operation of the disc table is
controlled by the microprocessor to brew a soft feeling.
main part is mounted on an aluminum die-casting frame, and resonance is
prevented, and also floating is carried out from a chassis, and transfer of
vibration is intercepted.
Floating was carried out also to the disc table by this, and the vibration
from the outside to a mechanism main part is stopped to the minimum.
strengthening is carried out to vibration by supporting a mechanism main part
with a thick metal chassis.
By considering it as strong frame structure at
the whole, stable operation also with little [ strongly ] sound quality change
to resonance by the sound pressure and the place to place from a speaker is
The noise shaper is carried in order to decrease quantization
A noise shaper returns an error to the following data in the
slight roundness which a digital filter generates, says that the noise in an
audio frequency band is decreased with the technique of reducing a noise, and is
reducing the re-quantization noise.
In order to correspond to CD in
which the emphasis was applied, the digital demphasis which changes the
characteristic in the state of a digital signal is adopted.
realized the characteristic of the deflection of ±0.001dB, and less than 1.5
phase difference to the predetermined characteristic.
In the audio
stage, it sets up so that there may be no necessity for magnification of the
output of a converter, and amplifier is considering it as direct-current servo
direct connection system of only a buffer, and is raising SN and the distorted
Volume control of a digital system is carried taking
advantage of the advantage of 18 bits.
Thanks to a 2-bit margin, also where
volume is extracted, there is little sound quality degradation and it can be
performing the ideal level control.
The variable range can be adjusted with
a remote commander by 0--24dB.
The output terminal carries one balanced
two RCA phono jacks and XLR type output in the analog system, and especially the
balanced output meets balanced transmission-ization of all the magnification
systems which the Accuphase is promoting.
Moreover, a digital output is
advocated based on a digital audio interface, and the optical fiber and 75-ohm
coaxial output which were enacted by the EIAJ standard are carried. An optical
transmitter improves pulse width distortion and a Jitter, and enables good
It is made for a timer to be interlocked with, and if a
power source is turned on, the power-on play function which starts a performance automatically is carried.
Wood Bode of a natural persimmon is employed
as both sides.
||The digital signal playback machine only for
||CD standard format
The number of
quantization: 16 bits
Sampling frequency: 44.1kHz
The number of channels: Two channels
Number of rotations:
Performance speed: 1.2 - 1.4 m/s regularity
||Non-contact optical reading (semiconductor
||GaAlAs (it is a terrorism diode to double)
||Rudder resistance type 18 bit
||8 time oversampling
Digital demphasis function
Deflection of ±0.001dB
|THD + noise
||0.002% (for 20Hz - 20000Hz)
|An Output power/Output load impedance
||Balanced: 2.5V/50 ohm (25ohm/25ohm), a
balanced XLR type
Unbalanced: 2.5V/50 ohm, a RCA phono jack
level control: For 0 - -24dB, a 1dB step
|Digital output format level
||Format: Digital Audio Interface
Optical:optical power: -21 - -15dBm (EIAJ), and luminescence
Coaxial: 0.5 Vp-p/75ohms
|The semiconductor used
||Transistor: 15 pieces
IC: 46 pieces
Diode: 26 pieces
||the width 475x height 115(piece -- it
includeds) x depth of 325mm
|Attachment: Remote commander RC-4
|Remote control system
||Infrared pulse system
||SUM-3 (an IEC name, R6), two pieces
|The maximum Dimensions
||Width 64x height 176x depth of 18mm
||180g (Battery included)