|455,000yen(around the 1995 time)
The compact disk player developed as a player which
serves as a pair based on the design concept of full balance integrated
The pickup mechanism is performing the linear
tracking operation by a straight Sledge scheme, and carries the digital-servo
system original with a primer in the servo mechanism which controls an operation
of a mechanism. Since many servo properties are controlled by software control,
in the manual coordination, the difficult robustness was acquired and the stable
operation has been realized.
Moreover, a silicone rubber material is used
for mounting of the whole pickup part, and the propagation of an internal
oscillation is reduced.
The cross interferencee is reduced by using a
digital part and an analog part as another power source, respectively. In the analog part, the crosstalk which originates a mass custom-made power transformer
in a power source as a right-and-left channel independency from a secondary
winding is eliminated.
Moreover, taking advantage of this design, the amplification and the full balance transmit which carries out a bridge output
are adopted for the signal of + and - on the same requirements, respectively.
Setting up an analog part is finished by the parts of careful selection.
Furthermore, it always turns on electricity by the standby functionality where
only the power source of a digital part can turn OFF, and the best requirements
In a D-A-conversion circuitry, it is a 20-bit sine
magnitude scheme digital analog converter of Burr-Brown. PCM1702 is adopted. By
the sine magnitude scheme, zero cross distortion made into the greatest hangup
of a multiple bit translation is canceled with the scheme of changing the
+/-wave of a signal independently, respectively.
In Model302, this PCM1702
was allotted by the right-and-left channel independency, and the multiple bit
translation is realized. Thereby, there is little influence of a RF noise
compared with a single bit scheme, and the performance of the multiple bit
scheme in which a disk information is direct convertible is pulled out.
Moreover, the digital filter is reducing the waveform error by
re-quatization as 20-bit 8 time oversampling.
The GIC filter with the
gently-sloping curve of the 3rd order is adopted as an analog filter, and it has
succeeded in gaining a natural tone quality. Using an active element, since a
signal passes only along a passive element, the GIC filter has the distinctive
characteristics of being hard to produce distortion and a noise.
chassis is making the front panel of 10mm thickness into the case structure
separated from the main unit, and it has the structure where the digital noise
from a display device does not get across to an audio circuitry easily while it
improves the rigidity of the whole chassis.
The remote controller which
can turn on and off elementary operation and a display-device window is
||Compact disk player
||Philips company CDM-12.1/05
||A 20-bit 8 time oversampling sine magnitude
scheme digital analog converter
Bur Broun company PCM1702
|Balance Output voltage
|Imbalanced Output voltage
|Output load impedance
||2mV or less
||20Hz - 20kHz
||0.003% (20Hz - 20kHz)
||Analog: XLR connector (balance)
Digital: RCA coaxial connector
||A maximum of 25W
||Width 174x height 361x depth of 265mm
||10kg (one set)
||Wireless remote control