Orban OPTIMOD-FM 8600Si, Руководство по эксплуатации

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OPTIMOD-FM DIGITAL OPERATION
3-71
MB Speech Threshold
(“S
PEECH
T
HR
,”
located in the Speech page of
A
DVANCED
C
ONTROL ) lets you set the increment (in dB) by which the setting of the
MB L
IMIT
T
HR
control is reduced when speech is detected (see Lookahead , above). This control is
particularly useful in minimizing speech distortion when you use the
LLH
ARD bass
clipper—it allows the main clipping distortion controller to work harder on speech
while preserving punch in music.
This control does not affect the HD processing chain.
Speech Detect (“
S
PEECH
D
ETECT
,”
located in the Speech page of
A
DVANCED
C
ONTROL
)
allows you to override the automatic speech/music detector, forcing the processing
into
S
PEECH
or
M
USIC
mode
.
The three available modes are
S
PEECH
, M
USIC
,
and
A
UTO
.
To Override the Speech/Music Detector
It is possible to force your Optimod into “speech” or “music” mode via its GPI and
API. One can achieve this functionality by creating a “speech” preset and a “music”
preset and programming the GPI to recall these presets as desired. To do so:
A) Create a preset with the desired settings for the music-mode and speech-
mode controls. Set its
S
PEECH
D
ETECT control to
M
USIC .
B) Save this preset as a User Preset.
C) Set the
S
PEECH
D
ETECT control to
S
PEECH
.
D) Save the resulting preset as a second User Preset/
You may now program two GPI inputs to recall these two presets as desired. Recall
the first preset to force “music” mode and recall the second preset to force
“speech” mode. Of course, you can use any other means of recalling these presets
including Automation, your Optimod’s API, and PC Remote.
About the 8600Si’s HD / Digital Radio Processing
The 8600Si HD (“HD Radio”) output is designed to feed streaming, netcasting, and
digital radio channels, which can be DAB, DAB+, DRM, or the iBiquity® HD Radio™
system approved for use in several countries including the United States .
The equalizer and five-band compressor/limiter in the HD processing chain have
their own sets of user-adjustable audio controls that are independent of the controls
in the FM analog transmission chain’s equalizer and five-band compressor/limiter.
This allows you to optimize the HD processing for the higher fidelity sound provided
by the digital channel while giving you the flexibility to process the analog channel
as you wish. The stereo enhancer, phase rotator, and 30 highpass filter are common
to the two processing chains and their controls, which affect both chains, appear on-
ly in the FM adjustment screens.
To facilitate matching the FM analog and HD signals to minimize analog/digital
crossfades in HD receivers, you can force the HD channel controls to track the FM
channel controls by setting the
FM Æ HD C
ONTROL
C
OUPLING
control to
FM Æ HD
.
When you have finished tuning a preset to optimize the sound of the analog chan-