Adaptability Through Multiple Audio Processing Structures - Orban OPTIMOD 6300 Operating Manual

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INTRODUCTION

Adaptability through Multiple Audio Processing Structures


OPTIMOD 6300 controls the audio bandwidth as necessary to accommodate
the transmitted sample frequency. OPTIMOD 6300's high frequency bandwidth
can be switched instantly (typically in 1 kHz increments) between 10 kHz and 20
kHz. 20 kHz is used for highest-quality systems. 15 kHz meets the requirements
of any system that uses 32 kHz sample frequency, while 10 kHz is appropriate for
24 kHz sample frequency.

The 6300's dual-mono mode allows entirely separate mono programs to be
processed, facilitating dual-language operation.
In this mode, both processing channels operate using the same process-
ing parameters (like release time); you cannot adjust the two channels to
provide different processing textures.

OPTIMOD 6300 supports Dolby Digital® Dialnorm metadata, which simpli-
fies setting up the 6300 to drive Dolby Digital channels.

The analog inputs are transformerless, balanced 10k instrumentation-
amplifier circuits and the analog outputs are transformerless, balanced, and
floating (with 50 impedance) to ensure highest transparency and accurate
pulse response.

All input, output, and power connections are rigorously RFI-suppressed to
Orban's traditional exacting standards, ensuring trouble-free installation.

The 6300 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 active at a time. OPTIMOD
6300 realizes its processing structures as a series of high-speed mathematical
computations made by Digital Signal Processing (DSP) chips.

The 6300 features two processing structures: 5-band for a spectrally consistent
sound with good loudness control, and 2-band for a transparent sound that
preserves the frequency balance of the original program material while also ef-
fectively controlling subjective loudness.

Orban's PreCode™ technology manipulates several aspects of the audio to
minimize artifacts caused by low bitrate codecs, ensuring consistent loudness
and texture from one source to the next. PreCode includes special audio band
detection algorithms that are energy and spectrum aware. This can improve co-
dec performance on some codecs by reducing audio processing induced codec
artifacts, even with program material that has been preprocessed or mastered
by other processing than Optimod. There are several factory presets tuned spe-
cifically for low bitrate codecs. These presets have "LBR" in their names.
ORBAN MODEL 6300