Manual Lynx LT-Madi (page 23 of 32) (English)

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The table below details SYNC SOURCE choices for the Aurora as pertinent to use within a

MADI-based system. Please see section 2.4 of the Aurora manual for general information about

available clock settings and clocking considerations with the Aurora.

EXT - External

Clock signals from Aurora WORD CLOCK input. In general, WORD

CLOCK is the preferred means to clock devices (including multiple

Auroras) in a MADI system. Auroras can be daisy-chained via wordclock,

or recipients of wordclock distribution. In a simple system (i.e. one Aurora

and a MADI source/destination), it is still ideal to use Word Clock sync

between the Aurora and the other MADI device(s) as a means to reduce

jitter system-wide.

EXT/2 - External Divided by 2

Used if the word clock is half the rate of the desired sample rate, which

would be more typical in legacy systems.

AES A – Port A Digital Input

Word Clock recovered from the Port A digital input (or AES channels 1-4

on an Aurora 8). In a MADI-based system this would be an unusual Sync

Source. It could be a solution when the Aurora is used with a MADI device

that does not have wordclock sync options but does have AES/EBU ports,

in order to avoid some of the issues with clocking via MADI connections.

AES B – Port B Digital Input

Word Clock recovered from the Port B digital input, like above. On an

Aurora 8, this would be signals from AES inputs 5-8.

LSLOT

Sample clock derived from the incoming MADI signal.

There are some specific issues to be aware of when clocking via MADI:

Clock signals derived from a MADI stream contain high-levels of jitter

because the clock rate for MADI I/O is asynchronous with the sample rate.

Thankfully, the Aurora was designed with Lynx’s SynchroLock technology

specifically to correct for jitter in incoming signals. It is capable of jitter

reduction up to 3000:1. Considering the poor jitter performance with the

MADI protocol, we

strongly recommend leaving SynchroLock ON when

clocking via LSLOT.

Additionally, MADI devices can only detect the base (1x) rate of the

incoming MADI stream. Therefore it is necessary to manually set the

Aurora to the desired Sample Rate when using LSLOT as the SYNC

SOURCE at sample rates > 48kHz (ie. 2x, 4x rates). For instance, if the

incoming MADI signal is operating at 88.2kHz, the Aurora will default to a

sample rate of 44.1kHz. Click the SAMPLE RATE button on the Aurora

front panel to toggle between 2x, 4x, 1x sample rates and set the Aurora to

88.2kHz for proper clock operation.

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Lynx LT-Madi Manual

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