Denon DRM-400 - Noise Reduction and Search Systems; Music Search System; Dolby Noise Reduction Systems

MUSIC SEARCH SYSTEM
This
device
is
a
convenient
system
which
detects
the
non-recorded
part
of
more
than
4
seconds
between
melodies,
cues
the
next
melody
while
the
present
melody
is
being
reproduced
or
automatically
detects
the
beginning
of
the
melody
now
being
reproduced
and
“makes
it
into
the
repro-
duceable
state.
6
1. For cueing the next melody while the present melody
is being reproduced:
At PLAY mode, depress the PLAY button and the FF
button simultaneously. This device will detect the
interval between melodies with the CUE state on,
automatically become the PLAY mode and _ begin
performing the next melody.
2. For hearing again the melody now being reproduced:
At PLAY mode, depress the PLAY button and the REW
button simultaneously. This device will detect the
interval between melodies: with ‘the REVIEW state on,
automatically becoine.. ‘the PLAY mode, detect the
beginning of the mel -how being performed and play
it from the first again. -
DOLBY C NOISE REDUCTION SYSTEM
@ 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 moré recent development and
represents a significantly improvements over Dolby B NR.
l™ Tape background noise consists primarily of high frequency
information which is particularly annoying during soft
passages. The Dolby NR system increase the level of
tow volume mid and high frequency signal 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 signal, but the level
of background noise generated by the tape is greatly
reduced.
Note:
MUSIC SEARCH is a function which eps ates by detecting
a comparatively long non-recorded part on the tape. There-
fore, MUSIC SEARCH may not operate normally in the
following cases. :
e Sound on the tape is interrupted by speech or conversa-
tion. F
eLong periods of pianissimo (softly played music) or
non-recorded intervals occur on the tape.
¢ The tape has picked up noise in a non-recorded interval.
e Non-recorded intervals on the tape are less than 4 seconds
in length.
eNoise-emitting electrical appliances are in operation
nearby. i.e.; Electric razors, drills, refrigerators, etc.
W@The operating principle of Dolby C NR is similar to that
of B except for the encoding/decoding response curves.
The noise reduction effect obtained by Dolby C NR is up
to 20dB, compared to 10dB with Dolby BNR. In addition,
Dolby C NR uses an antisaturation network and spectral
skewing circurity, and significantly improves the dynamic
range in the mid to high frequencies.