Optimod-AM 9400 V1.2 Operating Manual - Orban

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OPERATION ORBAN MODEL 9400
left and right channels. This prevents gain reduction in one channel from causing
audible spectral modulation on the other channel. However, the additional stereo
difference channel energy created by independent operation can adversely affect
certain low bitrate codecs (like WMA). It is wise to do careful listening tests through
the codec to determine if it sounds better with B5 MAXDELTGR = 0 dB or B5
MAXDELTGR = OFF.
Limiter Attack (See page 3-53).
Delta Release (See page 3-53.
HD Limiter Dr sets the drive level to the digital radio look-ahead limiter, determining
the amount of gain reduction that the limiter produces.
The factory default is +4.
There is no need to over-process the digital channel. HD “loudness wars” will not
only reduce quality but will also cause unbalanced, obtrusive crossfades between
the analog and digital channels in the radio. To brand your station’s sound, you can
choose the precise coloration you want on the digital channel. You can still take advantage
of all of the artistic choices implicit in equalization and multiband compression/limiting
settings. Yet you do not need to use excessive peak limiting, which can
only reduce quality, particularly with the very low bit rate codecs used in the HD AM
and DRM channels.
Band Mix
Intermediate Name Advanced Name Range
--- HD B1 Out Mix –6.0 … +6.0
--- HD B2 Out Mix –6.0 … +6.0
--- HD B3 Out Mix –6.0 … +6.0
--- HD B4 Out Mix –6.0 … +6.0
--- HD B5 Out Mix –6.0 … +6.0
--- HD Band 1 On/Off On, Off
--- HD Band 2 On/Off On, Off
--- HD Band 3 On/Off On, Off
--- HD Band 4 On/Off On, Off
--- HD Band 5 On/Off On, Off
--- HD B1MaxDeltGR 0 … 24 dB, Off
--- HD B2MaxDeltGR 0 … 24 dB, Off
--- HD B3MaxDeltGR 0 … 24 dB, Off
--- HD B4MaxDeltGR 0 … 24 dB, Off
--- HD B5MaxDeltGR 0 … 24 dB, Off
--- HD B2>B1 Couple 0 ... 100 %
--- HD B2>B3 Couple 0 ... 100 %
--- HD B3>B2 Couple 0 …100 %
--- HD B3>B4 Couple 0 ... 100 %
Table 3-13: Digital Radio Band Mix Controls