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Description: Designed specifically for the demands of television audio, the programmable OPTIMOD-TV 8282 digital audio processor meets all requirements of the various systems in use around the world.
It is impossible to characterize the
listening quality of even the simplest
limiter or compressor on the basis of
the usual specifications, because such
specifications cannot adequately
describe the crucial dynamic processes
that occur under program conditions.
Therefore, the only way to
meaningfully evaluate the sound of an
audio processor is by subjective
listening tests.
Certain
specifications are presented here to
assure the engineer that they are
reasonable, to help plan the
installation, and to help make certain
comparisons with other processing
equipment.
Some of the
specifications are for features that
are optional.
PERFORMANCE :
Specifications for measurements from
analog left/right input to analog
left/right output are as follows:
Frequency Response (all
structures, measured below gain
reduction and clipping thresholds,
high-pass filter off): Follows
standard 50 microseconds. or 75
microseconds. pre-emphasis curve
±0.20dB, 5Hz-15kHz. Analog and
digital left/right outputs can be
independently user-configured for flat
or pre-emphasized output.
Noise: Output noise floor
will depend upon how much gain
reduction the processor is set for
(AGC and/or DENSITY), gating level,
equalization, noise reduction, etc. It
is primarily governed by the dynamic
range of the A/D Converter. The
dynamic range of the digital signal
processing is 144dB.
Total System Distortion (de-
emphasized, 100% modulation): Less
than 0.01% THD, 20Hz-1kHz rising to
less than .05% at 15kHz. Less than
0.02% SMPTE IM Distortion.
Total System Separation:
Greater than 80dB, 20Hz-15kHz.
Polarity: (PROTECTION or
BYPASS structure) Absolute polarity
maintained. Positive-going signal on
input will result in positive-going
signal on output.
INSTALLATION
ANALOG AUDIO INPUT
Configuration: Left and
Right
Impedance: 600 ohms or
10k ohms load impedance,
electronically balanced, jumper
selectable
Common Mode Rejection:
Greater than 70dB, 50-60Hz.
Greater than 45dB, 60Hz-15kHz
Sensitivity: -40dBu to
+20dBu to produce 10dB gain reduction
at 1kHz
Maximum Input Level:
+27dBu
Connector: XLR-type,
female, EMI-suppressed. Pin 1 Chassis,
Pins 2 and 3 electronically balanced,
floating and symmetrical
ANALOG AUDIO OUTPUT
Configuration: Left and
right, flat or pre-emphasized
Source Impedance: 30
ohms, ±5%, electronically
balanced and floating
Load Impedance: 600 ohms
or greater, balanced or unbalanced.
Termination not required
Maximum Output Level:
+23.7dBu into 600 ohm or greater
balanced load
Connector: XLR-type,
male, EMI-suppressed. Pin 1 Chassis,
Pins 2 and 3 electronically balanced,
floating and symmetrical
DIGITAL INPUT AND OUTPUT
Connectors: XLR-type,
female input, male output, EMI
suppressed. Pin 1 Chassis, pins 2 and
3 transformer balanced and floating.
Configuration: Two-channel AES/EBU-
standard
8200D/SRC DIGITAL I/O CARD with
SAMPLE RATE CONVERSION
Input Sampling Rate: 32,
44.1, or 48kHz, automatically
selected
Input Level: Peak level
adjustable 0 to -20dB referenced to
the maximum allowable digital word
Output Sampling Rate:
Software selectable for 32, 44.1,
or 48kHz, SYNC (phase locks the
digital output to the digital input),
or 32SYNC (phase locks the digital
output at 32kHz to a digital input at
48kHz)
Output Level: Maximum
peak output (100% modulation)
adjustable -3 to -23dB referenced to
the maximum allowable digital word
Output Word Length:
Software selectable 18-bit, or 14-
bit truncated with re-dithering
Output Pre-emphasis:
Software selectable for flat, pre-
emphasized to the same pre-emphasis as
selected for the processing, J.17 pre-
emphasized, or pre-emphasized to the
same pre-emphasis as selected for the
processing plus J.17 pre-emphasis
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