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INTRODUCTION
Adaptability through Multiple Audio Processing Structures
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A processing structure is a program that operates as a complete audio processing
system. Only one processing structure can be active at a time. Just as there are many
possible ways of configuring a processing system using analog components (such as
equalizers, compressors, limiters, and clippers), there are many possible processing
structures achievable by OPTIMOD-DAB. OPTIMOD-DAB realizes its processing
structures as a series of high-speed mathematical computations made by Digital Sig-
nal Processing (DSP) chips.
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OPTIMOD-DAB features three processing structures: Five-Band (or Multi-Band)
for a consistent, "processed" sound, free from undesirable side effects; Two-Band
for a tastefully controlled sound that preserves the frequency balance of the original
program material; and Protect, which provides up to 25dB of safety limiting with
minimal side effects.
•
OPTIMOD-DAB can increase the density and loudness of the program material by
multi-band compression and look-ahead limiting — improving the consistency of
the station's sound and increasing loudness and definition remarkably, without pro-
ducing unpleasant side effects.
•
OPTIMOD-DAB rides gain over an adjustable range of up to 25dB, compressing
dynamic range and compensating for operator gain-riding errors and for gain incon-
sistencies in automated systems.
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OPTIMOD-DAB's processing structures are all phase-linear to maximize audible
transparency.
•
OPTIMOD-DAB can be changed from one processing structure to another with a
smooth cross-fade.
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OPTIMOD-DAB's Two-Band structure includes the CBS Loudness Controller for
DTV applications. This system measures subjective loudness (as perceived by an av-
erage listener) and then closes a feedback loop to limit loudness to a preset level. It
effectively controls loud commercials, which are the primary irritant in broadcast
television audio.
Controllable
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All compression, limiting, and clipping can be defeated by remote control to permit
broadcast system test and alignment or "proof of performance" tests.
•
Both 6200 and 6200S can be remote-controlled by an external computer running
Orban remote software (included) and connected directly or via modem to one of
OPTIMOD's RS-232 serial ports. 6200 OPTIMOD-DAB (and not Model 6200S) can
also be remote-controlled by 5-12V pulses applied to eight programmable, optically
isolated ports.
ORBAN Model 6200
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