96k frame
The so-called "96k frame pattern" (AES10) can be detected at the receiver side automatically. In this
mode, the frame numbers and corresponding user bits equal the number of channels submitted. The
"56 Ch." setting corresponds to 28 audio channels at 88.2 kHz and 96 kHz sample rates. The "64 Ch."
setting corresponds to 32 audio channels at 88.2 kHz and 96 kHz sample rates.
S/MUX 2
Sample multiplexing (or S/MUX 2) describes a method to distribute two consecutive samples onto
neighboring channels. The MADI signal remains exactly the same as in single speed with 56 or 64
channels including its user-bits. The receiver decodes the audio signal by passing the samples of
channel 1+2 as two consecutive samples for channel 1, samples of channel 3+4 as two consecutive
samples for channel 2, and so forth. The amount of channels corresponds to the same as the 96k
frame. This format cannot be automatically detected at the receiver side.
Quad Speed (176.4 kHz, 196 kHz)
Quad speed MADI does not have a standardized frame format. Therefore S/MUX 4 is used. The
encoding works the same way as S/MUX 2, except that four consecutive channels are used to transport
one audio channel. This reduces the available number of channels to 14 ("56 Ch." setting) or 16 ("64
Ch." setting).
When using MADI, the sample rate of the incoming MADI signal and the expected frame
format of the outgoing MADI signal must be set in the device.
Since the M-32 AD Pro has two independent MADI ports, all 32 analog inputs can be
sent at 192 kHz by using both ports, each carrying 16 audio channels.
9.2.2. Connecting Two Identical MADI Signals for Redundancy
The coaxial MADI input can be configured to automatically switch to an existing MADI optical signal in
case the coaxial signal fails. While existing routing and clock settings from the coaxial MADI input are
kept, the port’s name is changed to
MADI Auto Input
and its icon changes to reflect the feature. The
failover is seamless if the active input loses lock abruptly (e.g. one of the cables is unplugged).
The user is notified of the lost signal with a warning and redundancy can be re-
established.
For a seamless failover, the two MADI signals must be identical. However, only the
SYNC and LOCK states are evaluated to confirm the current input state. It is therefore
possible to send two different signals to the M-32 AD Pro as long as they are in sync.
To create MADI redundancy:
1. Switch on "enable MADI redundancy" in the
coaxial
tab of the
INPUT
section. The port will be
renamed to MADI Auto Input.
2. Create a routing from MADI Auto Input to any output.
RME M-32 AD Pro User’s Guide
9.2. MADI Input |
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