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3-34
OPERATION
usually noisy program material. Modern commercial recordings will almost never need
it. We expect that its main use will be in talk-oriented programming, including sports.
Please note that it is impossible to design such a system to handle all program material
without audible side effects. You will get best results if you set the
trol of the noise reduction system to complement the program material you are process-
ing. The
DWNEXP THR
input is relatively quiet. The best way to adjust the
the control set very high. Reduce the control setting while watching the gain reduction
meters. Eventually, you will see the gain increase in sync with the program. Go further
until you begin to hear noise modulation — a puffing or breathing sound (the input
noise) in sync with the input program material. Set the
until you can no longer hear the noise modulation. This is the best setting.
Obviously the correct setting will be different for a sporting event than for classical mu-
sic. It may be wise to define several presets with different settings of the
control, and to recall the preset that complements the program material of the moment.
Note also that it is virtually impossible to achieve undetectable dynamic noise reduction
of program material that is extremely noisy to begin with, because the program never
masks the noise. It is probably wiser to defeat the dynamic noise reduction with this sort
of material (traffic reports from helicopters and the like) to avoid objectionable side ef-
fects. You must let your ears guide you.
FINAL LIMT (Final Limit) control adjusts the level of the audio driving the look-
ahead limiter OPTIMOD-DAB uses to control fast peaks, and then adjusts the peak-to-
average ratio. The loudness/distortion trade-off is primarily determined by the
LIMT
control.
Turning up the
FINAL LIMT
peak-to-average ratio, and increasing the loudness on the air. When the amount of limit-
ing is increased, the audible intermodulation distortion caused by limiting is increased.
Lower settings reduce loudness, of course, but result in a cleaner sound.
If the
control is set to
MB REL
the look-ahead limiter will increase as the
it control may have to be turned down to compensate. To best understand how to
LIMT
make loudness/distortion trade-offs, perhaps the wisest thing to do is to recall a factory
multi-band preset, and then to adjust the
throughout its range. At each setting of the
the
control, the
MB DRIVE
trol. (You can see them by calling up the Full Control screen by pressing the
soft key.) This way, you can see how the factory programmers made the
CONTROL
trade-offs between the settings of the various distortion-determining controls at various
levels of processing.
should be set higher when the input is noisy and lower when the
control drives the look-ahead limiter harder, reducing the
or
(medium-fast), intermodulation distortion in
fast
mfast
MB DRIVE
LESS-MORE
LESS-MORE
control, and the
FINAL LIMT
ORBAN Model 6200
DWNEXP THR
control is to start with
DWNEXP THR
DWNEXP THR
DWNEXP THR
control is advanced, and the
control to several settings
control, examine the settings of
FINAL CLIPPING DRIVE
con-
control higher
FINAL
FINAL
con-
FULL
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