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SMPTE IN
This balanced connector receives SMPTE or EBU timecode to synchronise the DD1500 to
external equipment. The DD1500 can receive SMPTE/EBU at all frame rates and this is
set on the DL1500.
SMPTE OUT
This used to synchronise external devices to the DD1500. When receiving external
timecode through the SMPTE input, the DD1500m can be set to generate fresh,
electronic timecode at the SMPTE output. This may be useful if the source timecode is
defective in any way (for example, coming from a tape that has a lot of dropouts).
Furthermore, it is possible to set it so that the timecode being generated is different to that
being received for those occasions where conversion from one frame rate to another is
required or where you need to convert one timecode type to another (for example,
converting SMPTE/EBU to bi-phase or vice versa).
LEVEL
A level control is also provided so that you may set the output level of the timecode.
MIDI IN, OUT, THRU
MIDI IN will accept MIDI data to control the DD1500's internal 16-channel mixer. Using a
synchronised MIDI sequencer, mix data can be recorded into the sequencer to achieve
automated mixing. The MIDI OUT will send out MIDI Clock and MIDI Time Code (MTC) for
synchronising external MIDI sequencer. A tempo map function on the DD1500 allows
tempo changes and time signatures to be programmed for more precise control over the
external sequencer. The THRU passes a copy of the data received at the MIDI IN.
WORDCK (A)/VIDEO SYNC (A) IN
This BNC connection can accept TTL wordclock or video sync signals such as 'black and
burst' house sync signals. The TERM switch allows you to switch video sync termination on
or off. If the DD1500m is the last device in the chain of sync signals, termination should be
ON but if the DD1500m is somewhere in the middle of a chain, it should be set to OFF.
It is recommended to synchronise the DD1500m to a common house sync source using
this connection in order to maintain precise sync throughout your system.
WORDCLOCK (B) IN/OUT
This BNC connection functions as a wordclock output only and can be used when the
DD1500 is being used as a wordclock master (for example, when sync'ing a digital mixing
console).
VIDEO - VITC/SYNC (B) IN
This BNC connection has two uses. When you wish to lock playback to VITC, this
connection should be used and the VITC signal is derived from the VTR's video output
(also a BNC connection).
Another use for this connection is as an alternative video sync source. In this way, you
may have, for example, a TTL wordclock signal connected to WORDCK (A) and a video
sync signal connected to this input and switch between them as appropriate from the
DL1500. When synchronising to a video sync source through this input, the correct
termination should be set to ensure reliable operation.
BI-PHASE SYNC IN
This allows you to synchronise the DD1500 to film machines that generate bi-phase sync
signals. You may set the system to synchronise to 24 and 25 frames per second and may
select 2, 4 and 10 cycles from the DL1500.
BI-PHASE SYNC OUT
The DD1500m can generate bi-phase as well as sync to it and this connection allows you
to synchronise external film machines to the DD1500. A variety of frame rates can be
generated and these are set on the DL1500.
Version 2.00 - March, 1996
CONNECTIONS - DD1500M - 4
Page 11
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