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AUTO BLE TUNING SYSTEM
This deck is equipped with an auto tape selection function which
automatically sets recording characteristics to the type of tape being
used. However, commonly marketed tapes have unique
characteristics depending on type. and even tapes of the same type
may have subtle differences of sensitivity. frequency response, max-
imum output level, and operating bias, depending on the maker.The
AUTO BLE function allows you to get the most out of each tape's
chafacteristics, automatically setting and memoiizing the optimum
recording characteristics.
1. Press the POWER switch to turn on the power.
2. Insert a tape you wish to adjust for AUTO BLE into the cassette
holder. The automatic tape selection function will detect the type
of tape used, and will show that tape type in the tape indicator'
3. Press the bias switches in accordance with the program source to
be recorded (OVER, PEAK, UNDER).
4. The deck will automatically enter the recording mode, and "tun-
ing" of the tape will begin. The AUTO BLE indicators will light in
orcler.
5. The tuning processwill be completed in about 11 seconds' after
which the tape will be automatically rewound to a point iust past
the start point. The indicator above the switch selected lights' and
the optimum recording characteristics is memorized' The
mechanism then enters the stop mode'
Order in which indicators light:
I:
steadilylighted ffi: flashing
Of AUTO BLE
In order to get the best possible tape performance during recor-
ding, it is necessary to set bias, recording level (recording sensitivi-
ty) and equalization to the levels optimum for each tape used. On
most previous tape decks. standard values were set for average
tapes, thus even when the tape selector was set for the "proper"
position, delicate nuance differences between tapes could not be
matched. In addition, the use of bias equalization fine-tuning con-
trols to tune tapes audibly was very difficult to perform accurately,
requiring a good deal extra time and trouble. In contrast, the
AUTO BLE system uses a microprocessor to perform these ad-
justments automatically.
NOTE:
c When the same tape is "tuned" 2 or 3 times, the previous
memorized tunings will be erased, and only the last optimum
recording characteristics will be memorized.
.
When the power switch is turned off, all memory is erased.
c Be sure to break off the accidental erasure prevention tabs of
recorded tapes. lf a recorded tape with its erasurc Nevention
tabs in place is toaded in the deck and the bias switch is pressed
by mistake, the AUTO BLE operation will be initiated' and the
tape's recorded contents will be erased.
c lf the AIJTO BLE operation is begun with the tape fully wound to
its beginning (with teader tape exposed), following completion
of AUTO BLE, the tape will be rewound to a point iust prior to
the start of the tape's magnetic portion. As a rcsult, this position
on the counter maY not exactly match the counte/s initial star-
ting position.
.
When reversing a tape to pertorm recording from side A to side
B(or vice versa), the ATJTO BLE value is still memorized and so it
is not necessary to perform the AUTO BLE tuning operation on
the second side.
c
To clear the data set by the AUTO BLE tuning operation' press
the CLEAR switch.
.
There are times when the tape characteristics will not be
memorized (the indicator above the BIAS switch will not light)
depending on the tape. ln such a case, wind the tape to another
position using the PEAK BIAS BLE and pertorm the operation
once again. lf the tape characteristics still are not memorized,
operate the system in the standard value mode (the state in
which the indicator is not liil.
DOLBY WPES B AND C
The tape hiss (noise mainly in the high-frequency range) heard
when a recorded tape is played back can be very irritating. This is
particularly the case in pianissimo treble sections where violins, for
instance, are heard in an orchestral piece. The Dolby noise reduc-
tion system was developed in order to reduce this tape hiss. The
Dolby type B system is already widely used for noise reduction but
this unit features not only this type but also type C.
What the system does is this: when the midrange and treble sec-
tions. where the tape hiss is noticeable, are lower than the prescrib-
ed level, it records those sections at a level higher than the recor-
ding level at the "OFF" position of the Dolby system. During
playback, the level is reduced by an amount equivalent to this in-
crease and the sound is played back with a reduction in tape hiss.
This operation is performed automatically in accordance with the
strength of the input signals, and it is possible to improve the
signal-to-noise ratio at frequencies over 5 kHz by about 10 dB. As a
result, the system is really effective for the recording and playback
of ordinary broadcasts and records, etc.
However, when recording a program source with a wide dynamic
range, a greater reduction in the noise is required. lt was for this
reason that the Dolby type C system was developed'
The big difference between type B and type C is that the improve-
ment in the high-frequency range noise is approximately a high 19
dB, compared with the "OFF" position of the Dolby system, and
that the dynamic range is extended without causing the sound
quality to change {without generating breathing noise).
.
A note should be made of each tape recorded with the Dolby
system so that it is not mistakenly played back with the Dolby
system off.
o Always play back tapes with the same Dolby function which was
used when they were recorded. Playing back a tape recorded with
the Dolby system at the OFF (non-Dolby) position or playing back
a normal tape with the Dolby system will not result in the faithful
reproduction of the original sound.
B LE
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DOLEIY
TYPE
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