Aes3 (Aes/Ebu) Format; Message Handling - DCS 900E User Manual

dCS 900E / 902E User Manual
dCS Ltd

AES3 (AES/EBU) Format

Message Handling

The AES/EBU interface transmits a data structure that conforms to the dCS
version of AES3-1992. This contains 28 bits of Manchester encoded data, and a
4 bit near-Manchester encoded preamble in a subframe, and subframes are
further assembled in a block and frame structure. Each subframe contains:
•
preambles, to allow the receiver to sync up
•
up to 24 bits of audio data, transmitted lsb first
•
V, a validity bit
•
U, a user bit, for the "User Message"
•
C, a Channel Status bit, for the "System Message"
•
P, a parity bit
IMPORTANT!
The AES/EBU interface and the SPDIF interface have similar data
structures, although the messages are completely different. The two
structures are identified in the data domain by the use of the
Consumer/Professional bit (bit 1 in the message). A "1" indicates AES/EBU
format, a "0" indicates SPDIF format.
The default AES/EBU message attached to the output data by the unit before
being changed by the user is as follows:
Professional:
Non-Audio:
Mode:
Source:
Destination:
For more information on the way dCS implement the AES3 system message to
handle higher sample rates, see the Appendix to this manual. For the formal
definition of the AES3 interface, see footnote
8
AES3-1992 (ANSI S4.40-1992)
transmission format for two-channel linearly represented digital audio data".
Manual part no: DOC0029021E1
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"AES Recommended practice for digital audio engineering – Serial
Page 42
Manual for Software Versions 1.3x to 1.5x
8
, from the AES.
Document No: OS-MA-D0002-902.1E1
email to: more@dcsltd.co.uk
web site: www.dcsltd.co.uk
th
12 June 2000