Orban Optimod-FM 8300 Operating Manual page 154

3-36
OPERATION
complies with the ITU standard while minimizing the potential for unnatural and
audibly disturbing loudness inconsistencies caused by the operation of the multiplex
power controller.
BCL MODE (Bass Clip Mode) sets the operation of the bass clipper to H
, or S .
M
EDIUM OFT

H operates the clipper like the clipper in the 8200. It produces the most har-
ARD
monic distortion.
This can be useful if you want maximum bass punch, because this setting
allows bass transients (like kick drums) to make square waves. The peak
level of the fundamental component of a square wave is 2.1 dB higher
than the peak level of the flat top in the square wave. Therefore, this al-
lows you to get low bass that is actually higher than 100% modulation—
the harmonics produced by the clipping work to hold down the peak
level.
The square waves produced by this clipper are filtered through a 6
dB/octave lowpass filter that is down 3 dB at 400 Hz. This greatly reduces
the audibility of the higher clipper-generated harmonics. Nevertheless,
the downside is that material with sustained bass (including speech) will
sound substantially less clean than it will with the Medium or Soft set-
tings.
Note that the C
bass waveforms become. (See CLIP SHAPE on page 3-33.)

differs in two ways from the normal H
LLH
ARD

LLH automatically defeats the compressor lookahead. This action
ARD
is functionally equivalent to setting the L
except that it reduces input/output delay by 5 ms).

LLH prevents the bass clipper from switching to M
ARD
whenever speech is detected. By constraining the system in these
ways, it ensures that the delay is always 13 ms.
To minimize speech distortion, the speech/music detector automatically
switches the bass clipper to M
that the Five-Band structure is active, L
is set to H
M
ODE
speech/music detector.) If the bass clipper is set to LLH
speech/music detector will reset the clipper threshold to the setting speci-
fied by the S
PEECH
sults in very little bass clipper action during speech. This prevents audible
speech distortion that this clipper might otherwise introduce.
Switching the B
five milliseconds of delay from the signal path. Switching can cause audi-
ble clicks, pops, or thumps (due to waveform discontinuity) if it occurs
during program material. If you have some presets with LLH
clipper mode and some without, switching between these presets is likely
to cause clicks unless you do it during silence. However, these clicks will
control determines how squared-off the clipped
S
LIP HAPE
EDIUM
. (See "Lookahead" on page 3-53 for more about the
ARD
BCT control. The default setting is "0 dB," which re-
HR
to LLH
C M
ASS LIP ODE ARD
mode of the bass clipper:
ARD
control to O
OOKAHEAD
when speech is detected, provided
is H , and the B
ATENCY IGH
(from any other mode) removes
ORBAN MODEL 8300
, LL H ,
ARD ARD
,
UT
mode
EDIUM
C
ASS LIP
, the
ARD
bass
ARD