3 - PCI Card & Interfaces
The Sync Daughter Card
The Sync Daughter Card
The Sync Daughter card (included in the E-MU 1820MS system only) provides word
clock in and out, SMPTE (LTC) in and out and an additional MIDI output for trans-
mitting MIDI Time Code (MTC). MIDI Time Code is a special rendering of SMPTE that
can be transmitted over MIDI cables. For additional information about SMPTE, please
refer to SMPTE Background.
Synchronization is a basic technique needed for connecting multiple pieces of
equipment. Word Clock, S/PDIF or ADAT optical are all industry standard methods of
synchronizing digital equipment together at the system sample rate (44.1kHz, 48kHz,
96kHz, or 192kHz). The master clock source is set in the Mixer Session Settings menu.
See System Settings for more information.
Recording equipment can also be synchronized so that two audio recorders or an audio
and video recorder can lock together as a single machine. SMPTE and MTC sync are used
because they convey absolute time information. Word clock, S/PDIF or ADAT optical
sync only synchronize the sample rate and unlike SMPTE and MTC, do not convey song
position information. In a synchronized system, there is usually one MASTER machine,
and one or more SLAVES. When the master starts, the others will follow (chase).
The Sync Daughter card is a format converter. It converts incoming SMPTE time code to
MIDI Time Code (MTC) and passes this information to the host computer to be used by
a sequencer or audio recorder application. When your computer application is the
OMaster�, the Sync Daughter card converts MTC into SMPTE and sends it out to another
SMPTE device.
Connecting Cables to the Sync
Daughter Card
The Sync Daughter Card contains Word Clock
inputs and outputs for clock signals used in a
studio where a common sample rate reference is
Inrequired to keep multiple pieces of digital
equipment running together. This is referred to Word Clock
as Ohouse clock� or Ohouse sync,� and is set to
the actual sample rate of the system. Use a cable Out
with BNC connectors to connect incoming clock
signals to the Word Clock In jack on the Sync
Daughter card. Connect the Word Clock Out to
Inyour other digital equipment to use the Sync
Daughter Card as the Master Word Clock source. SMPTE
See Word Clock In/Out.
Out
The Sync Daughter Card provides SMPTE (LTC)
sync in and out, on two 1/4� phone jacks. LTC
can be recorded onto an unused audio track on
MTC Outan analog or digital recorder and then fed back
into the SMPTE input to synchronize your
computer sequencer/recorder. See SMPTE
Background for more information.
MIDI Time Code is also output whenever MTC
is being generated by the host application
(sequencer or audio recorder). A special cable
converts the mini DIN to a standard MIDI jack.
See the Sync Daughter Card Supplement for more information about using the Sync
Daughter Card.
14Creative Professional |
ACEC
