Digital Audio Processor for Television
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The all-digital OPTIMOD-TV 8382 Audio
Processor can help you achieve excellent audio quality and loudness
consistency in analog television broadcasting that uses FM aural
carriers with 75 µs or 50 µs pre-emphasis . Because all processing is
performed by high-speed mathematical calculations within Motorola
DSP56362 Digital Signal Processing chips, the processing has
cleanliness, quality, and stability over time and temperature that is
unmatched by analog processors.
Designed specifically for the
demands of television audio, the programmable OPTIMOD-TV 8382 digital
audio processor meets all requirements of the various mono, stereo and
dual- language systems in use around the world. The 8382 controls
program dynamics to maintain a comfortable range for the typical home
viewer, and, using its built-in CBS Loudness Controller™, it tames
subjective loudness to prevent commercials from becoming overly
obtrusive.
OPTIMOD-TV 8382 is fully compatible with all monaural
and stereo broadcast systems: BTSC, NICAM, EIAJ, and IEC dual carrier.
In addition to its usual stereo mode, it can be operated in dual-mono
mode to accommodate dual-language programming and it can switch between
stereo and dual-mono modes without mutes or interruptions in the
program.
Both analog and AES3 digital inputs and outputs are
supplied standard; the digital I/O can accept and emit sample rates
between 32 and 96 kHz and the output sample rate can be synchronized to
the 8382’s internal clock, to its digital input or to an AES11 signal
appearing at its sync input. An internal stereo generator is not
included; the 8382 is well matched to BTSC stereo generators from Orban
(model 8185) and CRL (model TVS-3003).
The 8382 is remote
controllable via eight programmable GPI ports, which can be used to
recall presets and change operating modes. It is also equipped for
remote control via RS232 serial or Ethernet ports, and it comes with a
full-featured remote control application that runs on Microsoft Windows
2000 or XP. Finally, the 8382 features the ability to have its input
AES3 “channel mode” bits determine its operating mode (stereo or
dual-mono), and it can send this information to downstream equipment via
the AES3 connection.
The 8382 can also be controlled via its
built-in clock-based automation, which can be programmed to change
presets and operating modes at preset times. The internal clock can be
reset to the hour via GPI contact closure to ensure that it remains
accurately synchronized with the facility’s master clock.
If you
wish to place level protection prior to your studio / transmitter link
(STL), use an Orban studio level control system expressly designed for
this purpose. (At the time of this writing, this is the Orban 8200ST
OPTIMOD-Studio Compressor/limiter / HF Limiter / Clipper.) The 8200ST
can be adjusted so that it substitutes for the broadband AGC circuitry
in OPTIMOD-TV, which is then defeated.
Features:
Analog Audio Input
-Configuration: Stereo / Dual-Mono.
-Impedance:
>10 kΩ load impedance, electronically balanced. (No jumper selection
available for 600 Ω. Through-hole pads are available on I/O module for
user-installed 600 Ω termination.)
-Nominal Input Level:Software adjustable from –4.0 to +13.0 dBu (VU).
-Maximum Input Level:+27 dBu.
Connectors:Two
XLR-type, female, EMI-suppressed. Pin 1 chassis ground, Pins 2 (+) and 3
electronically balanced, floating and symmetrical.
-A/D Conversion:24 bit 128x oversampled delta sigma converter with linear-phase anti-aliasing filter.
-Filtering: RFI filtered, with high-pass filter at 0.15 Hz (-3 dB).
Analog Audio Output
-Configuration:Stereo. Flat or pre-emphasized (at 50 µs or 75 µs), software-selectable.
-Source Impedance:50 Ω, electronically balanced and floating.
-Load Impedance:600 Ω or greater, balanced or unbalanced. Termination not required or recommended.
-Output Level:(100% peak modulation)
-Adjustable from –6 dBu to +24 dBu peak, into 600 Ω or greater load, software-adjustable.
-Signal-to-Noise:≥90 dB unweighted (Bypass mode, de-emphasized, 20 Hz – 15 kHz bandwidth, referenced to 100% modulation).
-L/R Crosstalk:≤ –70 dB, 20 Hz – 15 kHz.
-Distortion:≤0.01% THD (Bypass mode, de-emphasized) 20 Hz – 15 kHz bandwidth.
-Connectors:Two
XLR-type, male, EMI-suppressed. Pin 1 chassis ground, Pins 2 (+) and 3
electronically balanced, floating and symmetrical.
-D/A Conversion:24 bit 128x oversampled.
-Filtering.RFI filtered.