Orban OPTIMOD 8685, Operating Manual

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INTRODUCTION ORBAN MODEL 8685
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Dual power supplies with independent AC line inputs provide redundant op-
eration.
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All input, output, and power connections are rigorously RFI-suppressed to
Orban’s traditional exacting standards, ensuring trouble-free installation.
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The 8685 is designed and certified to meet all applicable international
safety and emissions standards .
Adaptability through Multiple Audio Processing Structures
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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
8685 realizes its processing structures as a series of high-speed mathematical
computations made by Digital Signal Processing (DSP) chips.
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The 8685 features two processing structures: Five-Band for a spectrally con-
sistent sound and Two-Band for a more transparent sound that preserves the
frequency balance of the original program material.
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A special Two-Band preset creates a no-compromise “Protect” function that is
functionally similar to the “
Protect ” structures in earlier Orban digital proces-
sors.
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The Five-Band and the Two-Band structures can be switched via a mute-free
crossfade .
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Audio processing can be smoothly activated and defeated on-air , allowing
programs that can benefit from full dynamic range to pass through the 8685
without dynamics compression. This pass-through can be activated and defeated
via clock-based automation, from the 8685’s front panel, from 8685’s PC Remote
software, from 8685’s programmable GPI inputs, or from 8685’s Ethernet or
RS232 serial API.
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The 8685’s AGC rides gain over an adjustable range of up to 25dB, compressing
dynamic range and compensating for both operator gain-riding errors and gain
inconsistencies in automated systems. The AGC output is available to drive STLs,
so the 8685 can be used as a studio AGC.
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The 8685’s processing structures are all phase-linear to maximize audible trans-
parency.
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The 8685’s equalizers and crossovers use 48-bit arithmetic to ensure mastering-
quality noise and distortion performance .
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The 8685 includes third-generation CBS Loudness Controllers™ for DTV appli-
cations. Separate loudness controllers are available in the multichannel