Orban OPTIMOD-AM 9300, Руководство по эксплуатации

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OPTIMOD-AM DIGITAL OPERATION
3-23
The amount of bass boost will depend on the fundamental frequency of a given
voice. If the fundamental frequency is far above 100Hz, there will be little voice en-
ergy in the bottom band and little or no audio bass boost can occur even if the gain
of the bottom band is higher than the gain of its neighbor. As the fundamental fre-
quency moves lower, more of this energy leaks into the bottom band, so you hear
more bass boost. If the fundamental frequency is very low (a rarity), there will be
enough energy in the bottom band to force significant gain reduction, and you will
hear less bass boost than if the fundamental frequency were a bit higher.
If the
G
ATE
T
HRESH
(Gate Threshold) control is turned
O
FF
, the
DJ B
ASS
boost setting
is disabled.
HF ENHANCER (“High Frequency Enhancer”) is a program-adaptive 6 dB/octave
shelving equalizer with a 4 kHz turnover frequency. It constantly monitors the ratio
between high frequency and broadband energy and adjusts the amount of equali-
zation in an attempt to make this ratio constant as the program material changes. It
can therefore create a bright, present sound without over-equalizing material that is
already bright.
B1-B5 DRIVE (“Band 1-5 Input Drive”) controls provide further equalization capabil-
ity. This set of controls can be used like a graphic equalizer to get a different “fla-
vor” of equalization from that provided by the other equalizer controls. Because the
crossovers have 18dB/octave slopes, this equalization is quite frequency-selective by
comparison to graphic equalizers with which you may be familiar. To prevent exces-
sive coloration and headroom problems, the range of these controls is limited to
3dB. Thus, the multiband drive controls should be used to fine-tune equalization
provided by the other equalizers.
LOWPASS (“Lowpass Filter Cutoff Frequency”) allows you to decrease (but not in-
crease) the low-pass cutoff frequency compared to its setting in active transmission
preset. See step (6.B) on page 2-22.
LPF SHAPE (“Lowpass Filter Shape”) allows you to decrease (but not increase) the
low-pass filter’s shape compared to its setting in active transmission preset. See step
(6.C) on page 2-23.
HIGHPASS (“Highpass Filter Cutoff Frequency”) allows you to increase (but not de-
crease) the highpass cutoff frequency compared to its setting in active transmission
preset. See step (6.D) on page 2-23.
AGC Controls
Several of the AGC controls are common to the Full Control and Advanced Control
screens, with additional AGC controls available in the Advance Modify screen, as
noted in the following table. (Note that “advanced” controls are accessible only
from 9300 PC Remote software.)