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DOLBY B AND C NOISE REDUCTION SYSTEM
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2 The Dolby noise reduction system substantially
reduces the tape background noise (hiss) inherent
in the cassette medium. Dolby B NR is most widely
in use. However Dolby C NR is a much more recent
development
and
represents
significant
improvements over Dolby B NR.
2 Tape background noise consists primarily of high
frequency information, which is particularly
annoying during soft passages. The Dolby NR
system increases the level of low volume mid- and
high-frequency signals during recording and
reduces the level of these signals by an identical
amount during playback. As a result, the playback
signal is identical to the original source, but the level
of background noise generated by the tape is
greatly reduced.
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DOLBY HX-PRO HEADROOM EXTENSION SYSTEM
This deck is equipped with the Dolby HX-PRO
headroom extension system. Since the system
functions automatically during recording, no switching
operation or adjustment is required. The system is
effective with any type of Normal, CrO2 and Metal
tape.
The Dolby HX-PRO headroom extension system
functions during recording to raise the saturation level
in the treble range. Therefore, most of the treble range
components distorted or lost during recording on
conventional cassette decks are more faithfully
recorded on the new DENON cassette deck.
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BEFORE SWITCHING OFF THE POWER
When you have finished using the CD player, before switching off the power be sure that the disc holder has been
closed with the OPEN/CLOSE (
5
) button.
CAUTION :
• Do not forcibly close the disc holder when the power is off. It may damage the unit when it is transported.
2 The operating principle of Dolby C NR is similar to
that of Dolby B NR except for the encoding
/decoding response curves. The noise reduction
effect obtained with Dolby C NR is up to 20 dB,
compared to 10 dB with Dolby B NR. In addition,
Dolby C NR uses an anti-saturation network and
spectral skewing circuitry for a significant
improvement in the dynamic range of the mid- to
high-frequencies.
(DN-T645 only)
2 Features of the Dolby HX-PRO Headroom
Extension System
• Performance of Normal and CrO2 tapes can be
improved to very close of that offered by Metal
tape.
• The dynamics in the treble range are improved
significantly.
• Since no decoding is necessary during playback, the
improved sound can be enjoyed on any type of tape
deck, including portable players and car audio
systems.
• The system functions whether the Dolby B/C NR
system is engaged or not.
MAINTENANCE
20
Head cleaning
After long usage, tape coating or dust may adhere to
the heads, causing deterioration of sound. Therefore,
the parts depicted in the illustration should be cleaned
regularly. Use a cotton swab moistened with a tape
head cleaning solution (such as alcohol).
NOTES :
• Some cleaning cassettes on the market have a
strong abrasive effects and may scratch the
heads. Always use cotton swabs instead of
cleaning cassettes.
• Since the use of metal tape is apt to collect more
dust on the heads, the heads should be cleaned
more often to enjoy the best possible sound.
ENGLISH
Cleaning the Pinch Rollers and
Capstans
If the pinch rollers or capstans accumulate dust, tape
transport may become unstable, as a result from
slippage, during recording or playback. The tape can
also be damaged if it gets entangled in the capstan.
Clean these parts with a cotton swab or a soft cloth
moistened with a tape head cleaning solution (such as
alcohol).
Demagnetizing the Heads
The heads will become magnetized after long usage or
if strongly magnetized objects are brought near them.
The result is a generation of noise, loss of the high
frequency range, and in extreme cases erasure of
treble
components
on
pre-recorded
tapes
combination with added noise.
Thus, the heads should be demagnetized at regular
intervals. (Head demagnetizers are separately available
from your dealer.)
How to Demagnetize the Tape Heads
1. Turn off the power.
2. Turn on the demagnetizer while it is at least 30 cm
away from the heads. Bring the demagnetizer near
the heads and slowly move it in small circles four or
five times in front of each head, making sure you do
not touch them.
3. Slowly move the demagnetizer away and turn it off
when it is at least 30 cm away from the heads.
in
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