Orban OPTIMOD-FM 8600Si, Руководство по эксплуатации

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3-70
OPERATION ORBAN MODEL 8600Si
these controls in the range of 70% to 100%. Below 70%, you will probably hear
pumping because the compressor function is trying to create some of the gain re-
duction that the faster limiting function would have otherwise achieved. If you hear
pumping in a band and you still wish to adjust the limiter attack to a low setting,
you can sometimes ameliorate or eliminate the pumping by slowing down the com-
pressor attack time in that band.
Delta Release controls are differential controls. They allow you to vary the release
time in any band of the Five-Band compressor / limiter by setting an offset between
the
MB R
ELEASE
setting and the actual release time you achieve in a given band. For
example, if you set the
MB R
ELEASE
control to medium-fast and the
B
AND
3 D
ELTA
GR
control to –2, then the band 3 release time will be the same as if you had set the
MB
R
ELEASE
control to medium and set the
B
AND
3 D
ELTA
G
R
control to 0. Thus, your set-
tings automatically track any changes you make in the
M
ULTIBAND
R
ELEASE
control. In
our example, the release time in band 3 will always be two “click stops” slower than
the setting of the
MB R
ELEASE
control.
If your setting of a given
D
ELTA
R
ELEASE
control would otherwise create
a release slower than “slow” or faster than “fast” (the two end-stops of
the
MB R
ELEASE
control), the band in question will instead set its release
time at the appropriate end-stop.
Lookahead activates or defeats the look-ahead functionality in the multiband com-
pressor / limiter. Defeating look-ahead improves transient impact at the expense of
distortion, particularly on speech. To mitigate this tradeoff, a selectable “auto”
mode turns look-ahead on for speech material and off for music, using an automatic
speech/music detector. Switching is seamless and click-free because we change the
delay in the compressor control sidechains; this is not a way to reduce the 8600Si’s
throughput delay.
Choices are
L
OOKAHEAD
I
N
, O
UT
,
and
A
UTO
.
Speech is detected if (1) the input is mono, and (2) there are syllabic
pauses at least once every 1.5 seconds. Speech with a stereo music back-
ground will usually be detected as “music,” or the detector may switch
back and forth randomly if the stereo content is right at the stereo /
mono detector’s threshold. Mono music with a “speech-like” envelope
may be incorrectly detected as “speech.” Music incorrectly detected as
“speech” will exhibit a slight loss of loudness and punch, but misdetec-
tion will never cause objectionable distortion on music.
Speech that is not located in the center of the stereo sound field will al-
ways be detected as “music” because the detector always identifies ste-
reo material as “music.” This can increase clipping distortion on such
speech.
If the B
ASS
C
LIP
M
ODE
is set to H
ARD
, the speech/music detector will auto-
matically set it to
M
EDIUM when speech is detected and
H
ARD otherwise
(unless
L
ATENCY
is
L
OW
, in which case
M
EDIUM
bass clipping is unavailable
and bass clipping will stay
H
ARD
).
Speech always sounds cleaner with
M
EDIUM
bass clipping and the in-
creased bass “punch” supplied by
H
ARD
is irrelevant to speech.
This control does not affect the HD processing chain.