The Five-Band Structure - Orban OPTIMOD-FM 5500 Operation Manual

3-43
OPTIMOD-FM DIGITAL OPERATION
Band Compressor. As the Two-Band Compressor B C control is moved towards
ASS PL
"100%," the 2B B T control affects the sound less and less.
ASS HRESHOLD
2B Master Attack sets the attack time of the Two-Band Compressor master com-
pressor (above 200Hz).
2B Bass Attack sets the attack time of the Two-Band Compressor bass compressor
(below 200Hz).
The relationship and interaction between 2B Clip, 2B High Frequency Limiting, and
the next two controls is complicated and is best appreciated by listening and ex-
perimenting:
2B High Frequency 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.
2B Crossover sets the structure of the two-band crossover to Linear or Linear with
No Delay. See AGC C on page 3-32 for more detail about these modes.
ROSSOVER
Maximum Distortion Control. See page 3-52.
MB Limit Speech Threshold lets you set the increment (in dB) by which the setting
of the MB L T control is reduced when speech is detected. This control allows
IMIT HR
the main clipping distortion controller to work harder on speech while preserving
punch in music.

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
variable 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
system 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.