
H
IGH
-D
ENSITY
A
UDIO
“ O
PERATION
21
A Note About Sample Order
Dual-wire and quad-wire AES connections achieve higher data rates than the standard single-
wire AES/EBU interface by transmitting blocks of successive samples in the high-speed stream
simultaneously on different wires.
For example, in dual-wire AES, the interface clocks at double speed (88.2 or 96 kHz), and on
any given clock cycle the first sample in a block of two transmits on the A channel wire while
the second sample transmits on the B channel wire.
Quad-wire AES expands on this method by clocking the interface at single speed (44.1 or 48
kHz) but transmitting a block of four successive samples simultaneously on channels A and B
of two AES/EBU dual-wire cables.
Logically, there are two possible ways to assign samples to wires in this configuration, as
illustrated in this table:
No standard exists for which method should be used.
To accommodate the widest range of converters, SonicStudio HD employs the second method
(1A 2A 1B 2B). Before attempting to work in High-Density Audio™, confirm that your
converter conforms to this method of quad-wire transmission.
Sample 1 Sample 2 Sample 3 Sample 4
Wire 1 Channel A Wire 1 Channel B Wire 2 Channel A Wire 2 Channel B
Wire 1 Channel A Wire 2 Channel A Wire 1 Channel B Wire 2 Channel B
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