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OPTIMOD-FM DIGITAL
OPERATION
3-15
essing advances further and further from its analog roots, this is the inevitable price
of progress.
18 ms is below the psychoacoustic “echo fusion threshold,” which means that talent
will not hear discrete slap echoes in their headphones. This means that they can
monitor comfortably off-air without being distracted or confused.
Some talent moving from an analog processing chain will require a learning period
to become accustomed to the voice coloration caused by “bone-conduction” comb
filtering. This is caused by the delayed headphone sound’s mixing with the live voice
sound, which introduces notches in the spectrum that the talent hears when he or
she talks. All digital processors induce this coloration to a greater or lesser extent.
Fortunately, it does not cause confusion or hesitation in the talent’s performance un-
less the delay is above the psychoacoustic “echo fusion” (Haas) threshold of ap-
proximately 20-25 ms, where the talent starts to hear slap echo in addition to fre-
quency response colorations.
If the talent is in the same location as the 5700i, you can configure the 5700i’s ana-
log outputs to supply a special low-latency monitor signal to drive headphones only.
(See step 10 on page 2-30.)
Customizing the 5700i’s Sound
The subjective setup controls on the 5700i give you the flexibility to customize your
station’s sound. Nevertheless, as with any audio processing system, proper adjust-
ment of these controls consists of balancing the trade-offs between loudness, den-
sity, and audible distortion. The following pages provide the information you need
to adjust the 5700i controls to suit your format, taste, and competitive situation.
When you start with one of our Factory Presets, there are two levels of subjective
adjustment available to you to let you customize the Factory Preset to your re-
quirements: Basic Modify and Full Modify. A third level,
Advanced Modify
, is accessi-
ble
only from the 5700i’s PC Remote software
.
See page 6-52 for a block diagram of the processing.
Basic Modify
BASIC
MODIFY
allows you to control three important elements of 5700i processing:
the stereo enhancer, the equalizer, and the dynamics section (multiband compres-
sion, limiting, and clipping). At this level, there is only one control for the dynamics
section:
L
ESS
-M
ORE
,
which changes
several different subjective setup control settings
simultaneously according to a table that we have created in the 5700i’s permanent
ROM (Read-Only Memory). In this table are sets of subjective setup control settings
that provide, in our opinion, the most favorable trade-off between loudness, den-
sity, and audible distortion for a given amount of dynamics processing. We believe
that most 5700i users will never need to go beyond the Basic level of control. The
combinations of subjective setup control settings produced by this control have been
Содержание OPTIMOD-FM 5700i
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