The Five-Band Structure; Putting The Five-Band Structure On The Air - Orban OPTIMOD-FM 8500S Operating Manual

OPTIMOD-FM DIGITAL
The HF Limiting control is in the clippers screen in the unit.
HF Clip Threshold sets the threshold of the multiband, distortion-cancelled clipper
in the Two-Band structure's high frequency limiter. Higher numbers yield more
brightness, but also cause more high frequency distortion.
This control does not affect the HD processing chain.
Max DistCntr (Maximum Distortion Control). See Max Dist Ctrl; page 3-61.
Speech Thresh (Speech Threshold) control. See MB Speech Threshold on page 3-63.

The Five-Band Structure

The Five-Band structure consists of a stereo enhancer, a slow gain-riding two-band
AGC, an equalization section, a five-band compressor, a dynamic single-ended noise
reduction system, an output mixer (for the five bands), and a complex peak limiting
system.
Unlike the Two-Band structure, whose two-band compressor has a continuously vari-
able release time, the release time of the Five-Band compressor is switchable to
seven increments between slow and fast. Each setting makes a significant difference
in the overall flavor and quality of the sound.
When the input is noisy, you can sometimes reduce the noise by activating the sin-
gle-ended noise reduction system. Functionally, the single-ended noise reduction sys-
tem combines a broadband downward expander with a program-dependent low-
pass filter. This noise reduction can be valuable in reducing audible hiss, rumble, or
ambient studio noise on-air.

Putting the Five-Band Structure on the Air

The Five-Band structure is very flexible, enabling you to fine-tune your on-air sound
to complement your programming. There are numerous Factory Programming Pre-
sets. They offer considerable variety, with various combinations of release time,
equalization, low frequency coupling, and high frequency coupling.
Start with one of these presets. Spend some time listening critically to your on-air
sound. Listen to a wide range of program material typical of your format, and listen
on several types of radios (not just on your studio monitors). Then, if you wish, cus-
tomize your sound using the information in "Customizing the Settings," which fol-
lows.
3-51
OPERATION