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dCS 904 User Manual Manual for Software Version 1.5x and 1.36
dCS Ltd June 2000
Manual part no: DOC135904 iss 2B2
Page 46
135904ma2b2.pdf file available from website
Contact
dCS
on + 44 1799 531 999 email to: more@dcsltd.co.uk
(inside the UK replace + 44 with 0) web site: www.dcsltd.co.uk
Digital Data Formats Supported
The unit supports the following digital data i/o formats,
AES/EBU (often referred to as AES3, PCM
format)
Dual AES (part of the AES3 spec, PCM format,
for 88.2 kS/s, 96 kS/s)
Quad AES (for 176.4 kS/s and 192 kS/s)
High Speed AES (part of the AES3 spec, PCM format,
for 88.2 kS/s, 96 kS/s)
Dual High Speed AES (For 176.4 kS/s and 192 kS/s)
TTL AES (AES3 on single ended TTL levels)
SDIF-2 (DSD or PCM)
High Speed SDIF-2 (for 88.2 kS/s and 96 kS/s)
SDIF-3 (DSD only)
DSD (using the SDIF-2 or SDIF-3
connector format)
For all AES3 type formats, the incoming Channel Status and User messages
are handled according to a priority system – they are either passed through,
where this is sensible, or generated and inserted by the unit. See section
“AES3 (AES/EBU) Format” on page 47 for more details.
The enhanced AES/EBU interface is fully implemented. Each channel has its
own parity and data validity bit, as well as User and Channel Status messages.
Cyclic Redundancy Counts (CRC's) are generated from the Channel Status
message. The Dual AES interface allows a 96 or 88.2 kS/s 24 bit signal to be
coded as two standard 48 or 44.1 kS/s 24 bit AES data streams, recorded as
four channels on a recorder with standard capacity, replayed and decoded back
into a single data stream / channel pair.
SDIF-2 used for PCM data has its message bits internally set to zero, with the
exception of the block code, which is implemented. See section “SDIF-2” on
page 50 for more details.
DSD has, at the time of writing, no messaging structure over SDIF-2 or SDIF-3.
Messaging for P3D is allowed for, but not defined yet. Contact dCS for more
details.