|158,000 yen(around the October, 1987 time)
CD player which pursued the way CD player should be, reproduced the music signal
in ultimate accuracy, and was thoroughly developed in quest of high-quality
sound high quality.
In order to pursue no vibrating and no resonating,
the thorough high rigidity design is performed.
Rigidity is improved much
more DP-9000 by really molding the chassis, the pleuron attachment, and the
mechanism attachment by aluminum die-casting, and also adopting honeycomb
Furthermore, 3kg of 3.2mm thickness copper-coating sheet steel
was adopted as the top plate, ceramics were adopted as the quality of the
material of 18mm thickness star wood material and a pedestal at pleuron, and
unnecessary resonance is banished thoroughly.
A mechanism part makes a
linear tracking mechanism, a chassis, a tray, and a brushless spindle motor the
product made from aluminum die-casting, and is improving rigidity.
In order to prevent the mutual intervention of a digital circuit and analog
circuitry, it has made an analog and digital one separate completely from
a power-source part to a wiring board.
Furthermore, in DP-9000, it is considered as 2 transformer power sources
which adopted the toroidalcore transformer as analogs and adopted the large-sized
core transformer as digital, and thorough exclusion of the noise interference
which passes a power source by this is carried out.
Moreover, the shielding case of the copper-coating
sheet steel has separated the analog board, and the digital circuit board
adopted the double-sided board, and has strengthened the shield for unnecessary
266th 18 bits of oversampling accuracy digital
filter was carried in the digital circuit 4 times, the sampling frequency was
pulled up 4 times, and the sampling noise is removed. Furthermore, by adoption
of this filter, use of the high order analog filter of the steep damping
characteristic after D/A conversion is avoided, and the 3rd GIC analog filter
excellent in the sound quality side is used.
The D/A converter of
right-and-left independent composition is adopted as a D/A conversion part, and
phase difference between right-and-left channels is eliminated and carried out.
moreover, this D/A converter -- Glitch Les -- since a D/A converter at high
speed, characteristic Glitch (spike noise) has been banished.
direct-current servo loading discrete composition direct-current amplifier which
eliminated the coupling condenser is adopted as the output amplifier located in
the last stage of an analog circuitry system.
The electrolytic condenser
for audios was begun and the part developed by all parts for audios is adopted.
The perpendicular wearing system disc size stabilized clamping circuit
developed making full use of the oscillating analysis technology of A&D is
carried in the mechanism part. Unnecessary vibration of the disc itself is
suppressed by clamping the inner circumference and the perimeter of a disc, and
sound quality degradation is suppressed. Moreover, the brushless spindle motor
with a centering mechanism is adopted as a motor.
In order that the
blemish and dust which were attached to the disc side may prevent skipping and
the problem of a truck jump from arising, original A servo system is carried.
At the time of regular, at the time of external oscillating detection, A
servo system corresponds to three states at the time of disc side blemish
detection, and controls a servo gain automatically.
Two kinds of digital
outputs of the same axle are carried as it is optical.
Moreover, the digital
on/off switch is carried and the interference at the time of an analog output is
Functions, such as program song selection and a direct song
selection and repeat performance, are carried.
The optical isolation by six photo-couplers is adopted.
The phi7.5OFC oxygen-free-copper cabtire AC
cord with a polar display is adopted.
||3 beam laser pickup
||Linear 16 bits
|Error correcting system
||Crossing interleave reed solomon
|The number of channels
|Dynamic range (EIAJ)
||97dB or more
|S/N ratio (EIAJ)
||106dB or more
||0.0025% or less
|Wow and flutter
||Below a measurement limit
|Analog output level
||Same axle: 0.5 Vp-p/75ohms
- -15dBm, the wavelength of 660nm
|A headphone output / impedance
||Brushless DD motor
|Power supply voltage
||Width 460x height 112x depth of 330mm
|Attachment: Wireless remote control DP-9000
||Infrared pulse system
|The Battery used
||AA x2 (direct-current3V)