OPTIMOD SURROUND PROCESSOR TECHNICAL DATA
6-3
Filtering: RFI filtered.
Base Configuration: Digital Audio Outputs (x6)
Configuration: AESid. Internal, remote-controllable routing switcher allows sending LF, RF,
C, LB1, RB1, LFE, LB2, RB2, STEREO L, STEREO R, DOWNMIX L, and DOWNMIX R
to any hardware output channel.
Sample Rate: Internal free running at 32, 44.1, 48, 88.1 or 96 kHz, selected in software.
Can also be synced to the AES3id Input #1,or to the sync input (which supports AES11id
and wordclock) at 32, 44.1, 48, 88.1 or 96 kHz, as configured in software. (Passband is
limited to approximately 14.7 kHz when using 32 kHz input and/or output sample rate.)
Word Length: Software selected for 24, 20, 18, or 16-bit resolution. First-order highpass
noise-shaped dither can be optionally added, Dither level is automatically adjusted to
complement the word length.
Connector: BNC, female, shell bypassed to chassis via 1000 pF capacitor, EMI-
suppressed. 75Ω impedance, terminated.
Output Level (100% peak modulation): –20.0 to 0.0 dBfs software controlled.
Filtering: RFI filtered.
Conveying and Re-authoring Dolby Metadata
The 8685 can, via an SMPTE Rdd06-2008-compliant RS-485 serial connection, via an HD-
SDI connection (when the optional HD-SDI module is installed), or via embedded Dolby-E
metadata (when the optional Dolby-E modules are installed in the HD-SDI module), auto-
matically convey its active surround metadata value to a downstream Dolby Digital encoder
like the Dolby DP-569, which must be set up according to its operating instructions to re-
ceive and act upon this input. This greatly reduces the possibility that operator error will
cause the wrong value of surround metadata to be transmitted to consumers.
To emit an RDD 06-2008-compliant signal, the 8685 must be receiving a valid input stream
that is compliant with RDD 06-2008—this is necessary to synchronize the output metadata
to video frame boundaries per the Dolby specification. When a valid input stream in present,
the 8685 passes this stream unchanged to its output except for the following modifications:
• The ac3_dialnorm word in the output metadata stream is reauthored so it is the
same as the 8685's active Dialnorm value.
• The ac3_dynrnge word in the output stream is set to 0, indicating that the down-
stream AC3 encoder must reauthor the line-mode DRC metadata, following the
level compression profile found in the ac3_dynrng1 word in the input metadata.
• The ac3_compre word in the output stream is set to 0, indicating that the down-
stream AC3 encoder must reauthor the RF-mode DRC metadata, following the
level compression profile found in the ac3_compr1 word in the input metadata.
Audio Reference Input
Configuration: Can accept wordclock or AES11id (75Ω) sync, automatically detected.
Connector: Female BNC.
Termination: Unterminated. For wordclock, use an external 75Ω terminator if the 6300 is
the last item in the chain. For AES11id, always use a 75Ω terminator.
Optional HD-SDI Input/Output Interface Module
OPTION #1:
HD-SDI Input/Output Interface Module.
• Replaces the base I/O module, which offers only AES3id input/output.
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