Optimus - Katadyn Products Inc. High-Speed Dubbing Stereo Cassette Deck SCT-56 - Manual (Page 7)

7
Basic Operation
Dolby Noise Reduction (NR) Dolby NR systems reduce tape hiss and background noise. When
recording, the systems listen for places where you might later hear hiss.
The systems record these sections at a higher level. When you play the
tape, the systems decrease these sections’ volume, restoring the music
to its original level and reducing the noise level.
Dolby B NR reduces background noise by about 10 dB. Dolby C NR
reduces background noise by about 20 dB.
Setting DOLBY NR for Playback
When you play a cassette tape, set DOLBY NR for the system used when
the tape was recorded. For prerecorded tapes, use these guidelines to
set
DOLBY NR :
• If Dolby NR or is not on the cassette label, set the switch to OFF .
• If Dolby NR or does appear, but the label does not specify Dolby
C NR, set the switch to B .
• If Dolby C NR is on the label, set the switch to C .
Setting DOLBY NR for Recording
Set DOLBY NR for the system you want to use.
You can play cassette tapes recorded with Dolby B or C NR on players
that do not have the same system. However, high-frequency sounds
might be too loud— especially in Dolby C NR recordings.
Recording with the Dolby HX Pro System
If the source you are recording has many high-frequency signals, the
signals can reduce the overall recording quality. During recording, the
Dolby HX Pro system adjusts for these signals to improve high-fre-
quency response. This feature is always turned on during recording.
You can play a cassette tape recorded with the Dolby HX Pro system on
any cassette player.