The high-class stereo cassette deck which supplied
all the state-of-the-art technologies of the cassette sound recording centering
on the original auto accu-bias scheme of Onkyo, and was developed.
closed-loop dual capstan scheme which arranges a 2-set Mino capstan and a pinch
roller on both the sub-s of a head, and runs them a tapes is adopted.
Although the using of the head corresponding to metal which has the powerful
hysteresis loop also in the case of two heads was difficult in space in order to
use the large window of both right and left of a cassette half as an object for
a drive in this system,The micro double gap metal erase head was developed, and
this hangup is solved.
For a sound recording, S&S sender strike and
sound-recording / play combination head designed in quest of a narrow gap, and a
respectively ideal distortion and frequency characteristic is adopted as a head
for a wide gap and a play.
It excels in magnetic property at core material, a sender strike with about the same hardness as a ferrite is used, and the
performance of a metal tape is demonstrated.
Moreover, the micro head of the
double gap which combined the dynalloy which is a newly developed material, and
the ferrite is adopted as the head for an erasure, according to the erasure
electric current from an oscillation block, a powerful magnetic field is made and the erasure functionality is made thoroughgoing.
3 motor system
which adopted the high torque DC motor for exclusive use as the object for a
capstan drive, the object for a reel drive, and the head base drive,
respectively is adopted.
The brushless FG servo DC motor which has obtained
the top-class validation by the silence and the stable swing of the rotation
performance is used for the motor for a capstan drive, and the dual capstan
scheme and the conjointly excellent wow and flutter are realized.
Furthermore, the full logic silence mechanism which controls an operation of
a drive system intensively by computer is raising the run performance and the
Aiming at the top quality at the time of a sound
recording, the best tuning of the bias value is carried out to one 1 tapes to be
used, and the auto accu-bias scheme which acquires the flat frequency
characteristic is developed and carried.
If a start button is pushed in a sound-recording pause, the mixed output
of two oscillators, low-pass 400Hz of and 10kHz of high regions, will
be recorded changing a bias value continuously. The compare search of low-pass
and the high region level is carried out, carrying out the simultaneous
play of this with three heads, and a bias value is locked at the point
whose level corresponded. And a tapes is rewound by a nowait lock and the
concurrent to a start location, and stands by in a sound-recording pause
Bias tuning is usually completed in a short time for 5 or less (a
maximum of 15 seconds) seconds,Furthermore, since memory of the best bias value
is mechanically carried out when an accu-bias control thumb is operated after a
completion of an auto accu-bias operation and an accu-bias indicator changes to
red from green,It is possible to employ the effect of an auto accu-bias
efficiently also in the case of an absence sound recording.
The real time counter which displays the residual quantity time and lapsed
time of a tapes direct by switchpoint change (minute second) is carried.
Only from the sending
side reel, rotational speed is detected also from the rolling-up side reel, with
the dual sensor scheme which calculates residual quantity time by computer from
both of rotational speed, the influence of the thickness of the tapes which
changes with a brand or grade is prevented theoretically, and the time detection
precision is raised.
Furthermore, in order to display residual quantity time
within several seconds from every position under performance, it is effective also when beginning a sound recording on the tapes in the middle of rolling up.
Furthermore, a residual quantity time window is continued during fast forward /
rewinding as well as the time of a play run.
Although a residual quantity
window switchpoint is three kinds of C-46/C-60/C-90, it can respond also to each
tapes of C-50 (46 and 60), C-80 (60 and 90), and C-120 (46 and 90) by carrying
out simultaneous push of any two.
Dolby C NR is carried and the high
reduction effect in the required frequency band of a noise reduction has been
acquired by making low a noise reduction operation start-up frequency compared
with Dolby B.
Moreover, the slide band scheme to which a start-up frequency of operation
is changed with the magnitude of input level is adopted. The bleeding event
(a noise breathing event) which becomes so conspicuous that the amount
of noise modifications becomes large is solved.
exaggerated level in a high region is detected, the anti saturation circuitry
which stops and records the high region of the Dainyuu power signal is built in, and the high region saturation level is substantially improved by returning at
the time of a play.
Level adjusting is possible even when it is the
tapes which contains the recording calibrator and in which a standard reference
tape differs from a recording level.
If the auto space REC-Mute
functionality is carried and an Auto-Space switchpoint is pushed during a sound
recording, a unrecorded fraction will be automatically made for about 5 seconds, and sound-recording standby will be carried out by Rec-Pause.
digital level indicator which uses 2 color FL tube is carried.
- With the
wide-range type up to 20dB - +8dB, it has become with the seven-point peek hold
(about 3 seconds) which can also read instantaneous peak value.
timer standby organization is carried.
The 0:00 position memory stop
& play after rewinding is possible.
||Stereo cassette deck
||Recording play: S&S sender strike
recording-play pair head
Erasure: FX ferrite splicing type erase head
||For capstans: DC servo motor
For the head bases: DC motor
|Wow and flutter
||Metal: 20Hz - 20kHz (25Hz-19kHz±3dB)
High: 20Hz - 18kHz (25Hz-17kHz±3dB)
Norm: 20Hz - 16kHz (25Hz-15kHz±3dB)
|SN ratio (Metal tapes)
||Dolby NR off:60dB
Dolby B NR on: The
improvement in 10dB (5kHz)
Dolby C NR on: The improvement in 20dB (5kHz)
||The minimum input level: 0.3mV/600 ohm
Input impedance: 5kohm
The conformity mic impedance 200 - 50kohm
||The minimum input level: 50mV
||Normal output: 1,100mV (0dB)
impedance: 50 or more kohms
||6mmphi standard stereo jack
impedance: 8ohms - 200ohms
||Width 450x height 100x depth of 392mm