Synchronization; Pro Tools Hd Card; Delta-Link Madi Hd; Wordclock / Frameclock - Solid State Logic XLogic Delta-Link MADI HD User Manual

XLogic Delta-Link MADI-HD

5. Synchronization

Pro Tools HD card

The Pro Tools HD card is designed to operate as a Clock Slave, locking to a clock reference signal
provided by the audio unit connected to its primary port. The interface unit can define the Sample
Rate internally, or can itself be synchronized to an external reference signal (e.g., WordClock).
Whenever the user selects a Sample Rate setting in the PC or Mac software, the corresponding
command is sent to the interface unit.

Delta-Link MADI HD

The Delta‐Link MADI HD , like the Pro Tools HD card, is designed to operate as a Clock Slave.
Once the card and Delta‐Link MADI HD are connected together, they can be seen as a unit
requiring an external clock reference signal. However, this unit now has MADI ports, instead of
the ʺDigital and Analogʺ connections to other devices provided by Pro Tools interfaces.
Although a reference signal is embedded in the Primary port, the MADI connection requires a
separate WordClock signal. Therefore, the Delta‐Link MADI HD is equipped with a WordClock
input connector.
Depending on the type of unit that is connected to the MADI port, the Sample Rate will no longer
change automatically when a setting is selected in the PC or Mac software (because there is no
command channel). Therefore, the Sample Rate needs to be set manualy at both ends (in the Pro
Tools software and on the hardware connected to the MADI port).

WordClock / FrameClock

The WordClock input can translate WordClock or FrameClock to the required Sample Rate.
The ʺLOCKʺ LED on the front panel indicates reception of a stable signal.
NOTE: When a ʺmultiplexingʺ mode is used for digital audio transfers, the frame rate of the audio
clock is equal to the audio sample rate at up to 48kHz, half of the audio sample rate at up to 96kHz
or a quarter of the audio sample rate at up to 192kHz.. For instance, at 44.1kHz, 88.2kHz or
176.4kHz, the frame rate is 44.1kHz. At 48kHz, 96kHz or 192kHz, the frame rate is 48kHz. The
term ʺFrameClockʺ denotes such an audio clock signal that is proportional but not always equal to
the sample rate.
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