Orban OPTIMOD 6300 Operating Manual page 262

6-2
TECHNICAL DATA
Installation
Delay: The minimum available input/output delay is approximately 20 ms with look-ahead
limiting active and 6 ms with look-ahead limiting bypassed. This can be padded to ex-
actly one frame of 24, 25, 29.97, or 30 frames / second video up to a maximum delay of
50 ms.
Operating mode: Stereo or dual-mono. In dual-mono mode, both processing channels
have the same subjective adjustments (as determined by the active preset) but are oth-
erwise independent, making this mode appropriate for dual-language transmissions. Op-
erating mode can be set via GPI, Ethernet and serial connections, internal clock-based
automation, and AES3 Status Bits.
Loudness Level Meter (x2): One meter for stereo-mode processing or two meters for dual-
mono mode processing channels, all meters realized in software. For a given processing
chain, two meters operate simultaneously: a long-term loudness meter displays loudness
over an ungated 3-second integration time or 10-second integration time using the ITU-
R BS.1770-2 algorithm (per ATSC A/85 and EBU R 128) and a short-term loudness me-
ter uses the Jones & Torick algorithm developed at CBS Technology Center in 1981.
The Jones & Torick meter's display time constants are matched to the psychoacoustic
loudness integration time of the human ear, reaching steady-state level in approximately
200 ms and having a decay time constant of approximately 300 ms. Hence, this meter
can indicate the momentary loudness of transient events like pistol shots, which may be
annoying to viewers but which the BS.1770-2 meter ignores because of its longer inte-
gration time. (B. L. Jones & E. L. Torick: "A New Loudness Indicator for Use in Broad-
casting," J. SMPTE, September 1981, pp 772-777.)
One ITU BS.1770-2 meter is always displayed on the 6300's front-panel; it indicates the
stereo loudness when the 6300 is in Stereo mode and it indicates the loudness of one of
the two mono processing channels (user selected) when the 6300 is in Dual-Mono
Mode. In 6300 PC Remote software, all loudness meters are displayed simultaneously.
Peak Control: As recommended in ITU-R BS.1770-3, the peak limiter is oversampled at
192 kHz, yielding a worst-case overshoot of 0.5 dB at the analog output and for all out-
put sample rates. (To achieve this performance at 32 kHz output sample rate, it is nec-
essary to set the 6300's lowpass filter cutoff frequency to 15 kHz.)
Analog Audio Input
Configuration: Stereo / Dual-Mono.
Impedance: >10k load impedance, electronically balanced
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).
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No jumper selection available for 600. Through-hole pads are available on I/O circuit board
for user-installed 600 termination.
ORBAN MODEL 6300
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