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Transmission Transmission

Audio Processors

8382

Digital Audio Processor for Television

From: Orban

Features:
-User-Friendly Interface
-Absolute Control of Peak Modulation
-Flexible Configuration

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.