Table of Contents
Advertisement
MADI Flags
Each audio channel within a MADI stream consists
of 32 bits. Audio (or non-audio data) accounts for
24 bits, with the remaining being used to identify
the state of the MADI stream and to preserve the
original AES format. It is these remaining bits that
are referred to as the MADI flags.
Of the eight data bits, four precede the audio data
(the least significant bits) and four follow after the
audio data (the most significant bits).
See below for details of each MADI flag.
MSB
31
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
Audio data
0
MADI frame synchronisation bit: When set to 1, this indicates the start of a MADI stream (i.e., ch1)
1
MADI channel active: When set to 1,this indicates an active channel in the MADI stream.
2
AES3 subframe A/B: Distinguishes between Left (0) and Right (1) channels of a channel pair.
3
AES3 Channel Status block start: A value of 1 indicates the first frame of the AES3 block.
28
AES3 Validity: A value of 0 indicates that valid audio is present.
29
AES3 User bit: This value is determined by the transmission device.
30
AES3 Channel Status bit: The value of this bit can be interrogated in the Channel Status displays.
AES3 Parity bit: Parity bit for error correction purposes.
31
16
BM-A2-64MADI User Manual v1.0
The BM-A2-64MADI provides a MADI Flag page in
the MADI Data display. Rotate the MENU encoder to
scroll to the MADI Flag page.
MflgA 1000..0011
MflgB 0000..0110
Example MADI Flag page
The display indicates both the left (A) and right (B)
channels of the selected channel pair.
The bits increment from right to left. So Bit 0 is
on the right and bit 31 is on the left. Audio data is
represented by the two dots in the middle of the data
sequence. Audio data can be interrogated in MADI
Audio data pages.
8
LSB
7 6
5
4
3
2
1 0
Bel Digital Audio Limited
Advertisement
Table of Contents
