OPTIMOD-FM TECHNICAL DATA
6-3
Filtering: RFI filtered, with high-pass filter at 0.15 Hz.
Analog Audio Output
Configuration: Stereo. Flat or pre-emphasized (at 50µs or 75µs), software-selectable.
Source Impedance: 50Ω, electronically balanced and floating.
Load Impedance: 600Ω or greater, balanced or unbalanced. Termination not required, or
recommended.
Output Level (100% peak modulation): Adjustable from –6 dBu to +24 dBu peak, into 600Ω
or greater load, software-adjustable.
Signal-to-Noise: >= 90 dB unweighted (Bypass mode, de-emphasized, 20 Hz–15 kHz
bandwidth, referenced to 100% modulation).
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.
Digital Audio Input
Configuration: Stereo per AES/EBU standard, 24 bit resolution, software selection of ste-
reo, mono from left, mono from right or mono from sum.
Sampling Rate: 32, 44.1 or 48 kHz automatically selected.
Connector: XLR-type, female, EMI-suppressed. Pin 1 chassis ground, pins 2 and 3 trans-
former balanced and floating, 110Ω impedance.
Input Reference Level: Variable within the range of –30 dBFS to –10 dBFS.
J.17 De-emphasis: Software-selectable.
Filtering: RFI filtered.
Digital Audio Output
Configuration: Stereo per AES/EBU standard. Output configured in software as flat, pre-
emphasized to the chosen processing pre-emphasis (50µs or 75µs), with– or without
J.17 pre-emphasis.
Sample Rate: Internal free running at 32, 44.1 or 48 kHz, selected in software. Can also be
synced to the AES/EBU SYNC input or the AES/EBU digital input at 32, 44.1, or 48 kHz,
as configured in software.
Word Length: Software selected for 24, 20, 18, 16 or 14-bit resolution. First-order highpass
noise-shaped dither can be optionally added, dither level automatically adjusted appro-
priately for the word length.
Connector: XLR-type, male, EMI-suppressed. Pin 1 chassis ground, pins 2 and 3 trans-
former balanced and floating, 110Ω impedance.
Output Level (100% peak modulation): –20.0 to 0.0 dBFS software controlled.
Filtering: RFI filtered.
Digital Sync Input
Configuration: Used for synchronization of the Digital Output signal to an external refer-
ence provided at this input.
Sampling Rate: 32, 44.1 and 48 kHz automatically selected.
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