Adaptability Through Multiple Audio Processing Structures - Orban Optimod-FM 8300 Operating Manual

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INTRODUCTION

Adaptability through Multiple Audio Processing Structures

system introduces peak overshoots into the 8300-processed signal. Because this
limiter closes a feedback loop around the audio processing, it allows the user to
adjust the processor's subjective setup controls freely without violating
BS412 limits, regardless of program material. The multiplex power limiter acts on
all outputs (not just the composite output). It reduces clipper drive when it re-
duces power, simultaneously reducing clipping distortion.

All input, output, and power connections are rigorously RFI-suppressed to
Orban's traditional exacting standards, ensuring trouble-free installation.

The 8300 is designed and certified to meet all applicable international
safety and emissions standards.

A processing structure is a program that operates as a complete audio proc-
essing system. Only one processing structure can be on-air at a time. OPTIMOD-
FM realizes its processing structures as a series of high-speed mathematical com-
putations made by Digital Signal Processing (DSP) chips.

The 8300 features three processing structures: Optimum Five-Band (or "Multi-
band"; 15 or 20 ms delay) for a consistent, "processed" sound, free from unde-
sirable side effects, Ultra-Low-Latency Five-Band (5 ms delay) for environ-
ments where talent monitors live off-air and they object to the delay of Opti-
mum Five-Band, and Two-Band for a transparent sound that preserves the fre-
quency balance of the original program material. A special Two-Band preset cre-
ates a no-compromise "Protect" function that is functionally similar to the "Pro-
tect" structures in earlier Orban digital processors. The Optimum Five-Band and
the Two-Band structures can be switched via a mute-free crossfade; the Low La-
tency Five-Band structure causes a very brief audio mute when activated.

The 8300 can increase the density and loudness of the program material by
multiband compression, limiting, and clipping. This improves the consistency of
the station's sound and increasing loudness and definition remarkably, without
producing unpleasant side effects.

The 8300 rides gain over an adjustable range of up to 25 dB, compressing dy-
namic range and compensating for both operator gain-riding errors and gain in-
consistencies in automated systems.

The 8300's Two-Band processing structure is phase-linear to maximize audible
transparency.

The 8300 can import and run any 8400 or 8500 user preset via the 8300 PC
Remote application. (Certain 8400 and 8500 features are not available and will
be reinterpreted.) See To Import Archived 8400 and 8500 Presets into Your 8300
on page 3-70 for details.)
ORBAN MODEL 8300