|
| NEC CD-10 |
|
| 99,800yen(around the 1989 time) |
The compact disk player announced as a new reference
of NEC.
16fs TFC (Transversal Filtering Circuit) is adopted as a digital
filter.
This uses the digital filter of 8fs, carries out the arithmetical
mean of the signal sampled with the predetermined sampling period, and the
signal in which only the one-half of the sampling period was to Sole, and has a
structure which makes an average complement data.
In these 16fs TFC, the
hold aperture time was set to 14microsec, and has obtained the smooth wave in
which the need for a low pass filter is not given also in 20kHz which is the
highest register frequency of compact disk.
In compact-disk-10,
logic-array-ization of 16fs TFC was performed and the simpler and straight
stream composition is realized.
4DAC B.S.S (Balanced Summing System) of
the balanced type return circuitry in which each two right and left use the
digital analog converter specially chosen in the precision at the time of small
level out of DAC chosen by the merit of the linearity is carried in the
D-A-conversion circuitry.
Moreover, simple-ization of the signal circuit of
an analog part, such as making a coupling capacitor unnecessary, is attained by
carrying out the balance operation of the unipolar type DAC.
The DFC
advanced communication function code of a very thick is adopted as a
power-source part, and A/D full independence 2 transformer is carried in it.
Furthermore, by adopting the independent power-feeding scheme which divides
the coil by the side of a sub- the whole stage, the cross interferencee of the analog system in a power-source part and a digital system is prevented.
Moreover, as a result of investigating dynamic dynamism, the generous high resisting pressure article is used for an electrolytic capacitor at all. Furthermore, it does not depend on a pattern product line at the key point of a power-source line, but the cross section is large, it wires with the thick wire rod (#18) of a leather film, and quality improvement is attained more.
In order to prevent mixing of a digital noise, the A/D full separation
2LOAD-RESISTOR-BOX chassis is adopted as a chassis structure.
Since the
interior of a chassis was divided into the mechanism digital system, and a D-A
conversion and an analog system, and also the digital system and the analog
system had a platform, respectively and the grounding point has also been
independent, mixing of a digital noise has been prevented.
The direct
mechanical ground construction is adopted paying attention to the relationship
of an oscillation and sound.
The sintered alloy was adopted as the foot of a Mechanism-base, and the
vibration is prevented by filling up a tray part with vibration proof material.
Moreover, about the power transformer which serves as a source of an oscillation
inside a CD player, it is fixing to the transformer base of a 3.2mm thickness
griddle insulated from the chassis through 1mm special vibration proof
material, and, also in oscillation and electrically, has dissociated.
Furthermore, 3-fold structure which added the griddle of 2mm
thickness and 1.6mm thickness to the griddle of the usual 1mm thickness is
adopted as a chassis sole plate,The whole case of high rigidity was
monocoque-ized and the simple and controlled oscillation which suppressed the
natural oscillation is dropped into the terrestrial mass through the foot
(65phi380g) of a huge heavy weight class.
The balance output-terminal is
carried and the output-terminal of a right phase and each negative phase is
carried in the imbalanced output-terminal.
the standalone version which does
not share a grounding carried out high salary shaving appearance to the
imbalanced output-terminal, and the type is adopted as it.
The simple 9
figures of light emitting diode window display device is adopted.
Furthermore, in order to eliminate the ill effect to the tone quality by
making a display device turn on, the off-position is carried, and if it turns
OFF, it will intercept from the power source using a relay.
Moreover, three
steps of dimmer switches from which a brighter window and the window which
stopped the luminosity can be chosen are carried.
The absolute phase
(signal polarity) circuit changing switch with which the polarity of a
systemwide is united is carried.
|
.JPG) |
.JPG) |
|
|
|
| Form |
Compact disk player |
| Frequency characteristic |
DC-20kHz±0.5dB |
| THD |
0.0018% or less |
| Dynamic range |
98dB or more |
| S/N ratio |
110dB or more |
| Channel separation |
103dB or more (1kHz) |
| Wow and flutter |
Below a limit-of-measurement value
(quartz-crystal oscillation precision) |
| Output voltage |
Analog: 2.5Vrms
Digital: 0.5 Vp-p/75ohm (Coaxial) |
| Supply voltage |
AC100V, 50Hz/60Hz |
| Power consumption |
21W |
| Dimensions |
Main unit: The width 430x height 110x depth
of 290mm
Maxima: The width 430x height 117.5x depth of 367mm
|
| Weight |
13.5kg |
| Adjunct |
Wireless remote control AR-10 |
|
|
|
.JPG)
.JPG)
.JPG)
.JPG)
.JPG)