Model 2020 MkIII Audio Processor
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At higher densities, there will be less interaction
between the peak limiting and the multiband com-
pression. This will permit a greater amount of clip-
ping, and consequently greater loudness. At excessive
density settings, you will hear increasing distortion.
We recommend staying within the density ranges
indicated below.
High Frequency Limiter and Low Pass Filter
The MkIII HF Limiter (Pre-Emphasis Processor) is a
proprietary new split-band design that saves more of
the high frequency content without distortion. This
new limiter is a complete redesign, inheriting little
from the MkII limiter.
The "Hardness" control in the original 2020 is elimi-
nated totally. Taking its place is the "Brilliance" control.
This controls the release time and thus the intensity of
the pre-emphased frequencies. It is not an equalizer
as with the MkII. Using a higher setting allows more
highs to be retained. Adjust this control to obtain the
smoothness or brightness you desire.
First introduced with the MkII, The MkIII 15kHz
Stereo Lowpass Filter is also a new proprietary design
that eliminates almost all of the distortion associated
with previous overshoot compensated filters. This
new filter protects the pilot frequency by as much as
80dB even when heavy overshoot compensation is
occurring. Out-of-band energy is equally well rejected
with virtually no trash passing through and beyond the
cutoff frequency while overshoot is held to less than 2
percent. The importance of this is will be appreciated
both in the higher sound quality and in extended F.M.
broadcast coverage.
Stereo Generator with RDS interface
The PPDM stereo generator in the MkIII is the
same basic design as in the original 2020 and exactly
the same as the MkII version. The MkIII has two
separately trimmable multiplex outputs and that there
is a direct RDS interface. The RDS interface consists
of an output of an asymmetric 19kHz rectangular
wave with level trim and an input with level trim for
the RDS injection signal itself.
Front Panel
The front panel of the MkIII is updated with cosmetic
improvements but remains essentially the same as
the original 2020 except for the addition of a display
contrast adjustment. Navigating the menus is also the
same. The menus themselves are same with only the
exceptions that have been pointed out presently.
Remote Control Software
The remote control software has been updated with
improved graphics and features. It is now much more
reliable with modem connections. The new software
is a 32-Bit application and is therefore not Windows
3.x compatible. You will need to run Windows 95,
98, or 2000. We have not tested it on Windows
NT 4.x.
Figure 4
MkIII Pre-Emphasis Limiter Menu
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Figure 5
MkIII Stereo Generator I/O
Things That Are New or Different
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Figure 3
Recommended Density Limits
BS-412 Range
Standard FM Range
Mastering Range
