Orban Optimod-TV 8382, Operating Manual

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OPTIMOD-TV DIGITAL TECHNICAL DATA
6-1
Section 6
Technical Data
Specifications
It is impossible to characterize the listening quality of even the simplest limiter or
compressor based on specifications, because such specifications cannot adequately
describe the crucial dynamic processes that occur under program conditions. There-
fore, the only way to evaluate the sound of an audio processor meaningfully is by
subjective listening tests.
Certain specifications are presented here to assure the engineer that they are rea-
sonable, to help plan the installation, and make certain comparisons with other
processing equipment.
Performance
Specifications apply for measurements from analog left/right input to analog left/right output.
Frequency Response (Bypass Mode): Follows standard 50
µ
s or 75
µ
s pre-emphasis curve
± 0.10 dB, 2.0 Hz–15 kHz. Analog left/right output and digital output can be user-
configured for flat or pre-emphasized output.
Noise: Output noise floor will depend upon how much gain the processor is set for (Limit
Drive, AGC Drive, Two-Band Drive, and/or Multiband Drive), gating level, equalization,
noise reduction, etc. The dynamic range of the A/D Converter, which has a specified
overload-to–noise ratio of 110 dB, primarily governs it. The dynamic range of the digital
signal processing is 144 dB.
Total System Distortion (de-emphasized, 100% modulation): <0.01% THD, 20 Hz–1 kHz,
rising to <0.05% at 15 kHz. <0.02% SMPTE IM Distortion.
Total System L/R Channel Separation: >80 dB, 20 Hz – 15 kHz; 90 dB typical (analog
I/O) Digital I/O separation is essentially infinite.
Polarity (Two-Band and Bypass Modes): Absolute polarity maintained. Positive-going signal
on input will result in positive-going signal on output.
Processing Sample Rate: The 8382 is a “multirate” system, using internal rates from 32
kHz to 256 kHz as appropriate for the processing being performed. Audio clippers oper-
ate at 256 kHz.
Processing Resolution: Internal processing has 24 bit (fixed point) or higher resolution;
uses Motorola DSP56362 DSP chips.
Delay: The minimum available input/output delay is approximately 20 ms, as determined by
the advanced “look-ahead” processing algorithms employed. This can be padded to ex-
actly one frame of 24, 25, 29.97, or 30 frames / second video.