||69,800yen(around the 1988 time)
64,800yen(April 1, 1989 amendment)
The compact disk player which adopted the 4DAC20bit
The 4DAC linear 20bit system which raised the reappearance
capacity of the minute signal sharply is adopted as a D-A-conversion part.
In this circuitry, after having adopted as Lch and each Rch 4DAC stream
compositions which used the digital analog converter for Masanobu numbers, and
the digital analog converter for negative signals and carrying out the D-A
conversion of each component individually at them, it is compounding by the
differential amplifier. The problem of the zero cross distortion by the level
difference of the point crossing [ zero ] is theoretically solved by carrying
out and performing distinction of the Masanobu number and a negative signal, and
a change operation by 4DAC processor LSI.
A highly precise 20-bit 8 time
oversampling digital filter is adopted as the digital filter which removes an
unnecessary RF component to the input signal from compact disk. By decomposing
signal level into 20 bits (1048576 steps) from conventional 16 bits (65536
steps), the translation error at the time of a minute signal input is suppressed
to the minimum, and the high-density data is sent to the digital analog
Moreover, the distorted ill effect with the element and
semiconductor which constitute group delay distortion and a low pass filter from
the using of the analog low pass filter of a low degree having been attained is
also reduced sharply.
In order to improve the S/N ratio at the time of a
minute signal, the silence deglitch circuitry is carried.
circuitry (sample hold circuit) which removes the glitch noise produced at the
time of the bit change of a digital analog converter is fixed to a sample mode at the time of a minute signal (-12dB or less),The problem of the switching
noise produced from the deglitch circuitry itself [ used as the hindrance of
minute signal regeneration ] is solved.
The classAA scheme is adopted as
a sample hold circuit, buffer amplifier, and headphone amplifier.
classAA, two different amplifier shares the voltage control and electric-current
drive which were being conventionally performed with one amplifier, and the low
distortion and the high-resolution of a mid-high range are realized by making
possible the faithful waveform transmission which cannot be easily influenced by
a load intensity.
8 sample linear interpolation is carried as a measure against a data error by the crack and dirt of a disk signal side.
If a data
error occurs with the crack and dirt of a disk signal side in the conventional
compact disk player, by signal-processing LSI, a signal processing will be
shifted in order of a before [ bug fixing -> average interpolation -> ]
value hold according to the amount of errors.
if the errors of a data are
less than eight successions, I will go by 8 sample linear interpolation to hold
a last value -- the noise occurrence is prevented by linear interpolation,
without carrying out.
The discrete low-noise active servo power supply
is adopted as a power circuit. By this, a minute variation of supply voltage can
also be faithfully fed back now by realizing the reduction in the noise of an
audio power source, low-impedance-izing, and a high ripple rejection, and the
supply voltage variation by operation of DAC is held down.
digital output termination is carried.
The study is used for the part
which constitutes an audio circuitry in piles from double-sideds of a physical
characteristic and an audition testing.
The rectification noise is reduced
by using first recovery diode and the electrolytic capacitor for mass audios for
a rectifier circuit. Moreover, in the gland for audios, the BUS bar in which Lch
and Rch became independent is arranged, and low-impedance-ization of a grand
line is attained.
Furthermore, the high-quality sound electrolytic capacitor
is adopted as a capacitor for the newly developed high-quality sound carbon film
resistor that used the non-magnetic-material cap for the resistor, and, between
low distortions and in addition to a transparent feeling, the improvement in
musicality is aimed at.
To the sound pressure oscillation transmitted
from a speaker, the multilayer structure base which consists of heterogeneous
materials, such as the metal chassis base and the TNRC (technics non Resonance
compound) base, is adopted, and the translation to heat energy from vibrational
energy has realized the high vibration proof effect.
Moreover, to the floor
oscillation transmitted from a setting stand, the oscillation which gets across
to the main unit of a player in four large-sized insulators was intercepted, it
is having a multiplex-insulator stream composition which carries out the double
floating of the optical deck on it, and large periodic damping is realized.
The high speed linear-access system which used the high precision linear
motor is carried in the actuator of the traversal mechanism to which a pickup is
moved. The rapid access is realized by applying a polish to the original control
system which made full use of a microcomputer, and while improving an
operationality, a high endurance and silence are acquired.
efficiency ratio of laser light is high to a pickup, and 1 original beam scheme
which improved the SN ratio of the regenerative signal sharply is adopted as it.
Furthermore, the molding glass lens is really [ original / aspheric surface ]
adopted as the change-control-form lens of this laser pickup, and the signal
read capacity strong against the crack and dirt on the top layer of a disk to
have excelled, and a high robustness have been acquired.
The edit guide functionality is carried and the length (90 minutes/60 minutes/46
minutes) of the tapes to be used is only chosen at the time of the sound
recording and edit from compact disk on a tapes,The sequence, the number
of music, and residual time of the music which can be recorded to A side
of a tapes and B side are calculated automatically, and it indicates by
simultaneous at a semi dual music matrix display device (residual time
is switched and displayed). The length of the tapes to record can be set
as freedom other than the alternative form by an editing key from 1 minute
to 99 minutes using 20 keys. Furthermore, ON/OFF of an auto space is also
The De Dis Klink functionality is carried, and the number and residual
time of the sequence and music of the music which can be recorded from
other disks can be calculated automatically and displayed on the remaining
fraction of the tapes recorded from the disk of the 1st sheet.
After carrying the auto peek
search function and carrying out the autmatic detection of the peak level of
disk all songs or special-NetWare-program music, the repetition play for about 3
seconds and a total of about 6 seconds can be performed before and after a peak
point. The exact recording-level setups by the side of the deck can be easily
performed by using this functionality.
Moreover, AB peek search in which a
high precision peek search of arbitrary two-point (A-B) zones is possible in the
state of a play is also carried.
The shuttle search is carried and it
can search at four steps of speed in right reverse bothways from 1/8X to 76X
with the angle of a dial, respectively.
The window repetition play
functionality is carried, and a play is repeatedly possible, making the phrase
sound of a pause location with a pause status. The play time width can choose
narrow (for about 0.2 seconds), and wide (for about 1 second).
display device which a Lch/Rch independent digital level meter and a playing
position can switch and display is carried.
functionality by 20 keys is carried.
Functionalities, such as 32 step
random special NetWare program, a random play, a repeat, an A-B repeat, and
Autocue, are carried.
Normal and random 2 mode timer play functionality
The time display function of 4 mode switching scheme is
ON/OFF of a display device is possible.
control is attached.
||Compact disk player
|The number of channels
||2.5Vrms (0dB, EIAJ)
||100dB or more (EIAJ)
||113dB or more (EIAJ)
||0.0023% or less (1kHz, EIAJ)
||0.0015% or less (1kHz, 0dB, harmonic content
up to the 10th order)
||110dB or more (EIAJ)
|Wow and flutter
||Below a limit of measurement (EIAJ)
|Low pass filter
||20 bits of 8fs digital filter
|Error correcting system
||Technics super decoding algorithm
8 sample linear interpolation functionality)
||High speed linear-access system
||60mW/32 ohms (variable)
||Width 430x height 126.5x depth of 338mm
|Adjunct: Wireless remote control
|The Battery used
||AAA -- Battery 1.5Vx2