Ltc Sync; Dubbing Mode; Virtual Tape Mode; Virtual Tape Format - Merging Pyramix User Manual

LTC sync

EXAMPLE - where a cinema projector must be the master
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All LTC sync ballistics in the Pyramix software have been carefully designed to both allow a large locking range (-7
to +5%) while still exhibiting extremely low instantaneous jitter and more importantly a controlled maximum
speed change slope - not more than about 25 PPM per ms (25 Parts Per Million/millisecond) - in order to make sure
that any other digital audio equipment connected to it's Wordclock output is provided with a smoothly changing
clock speed (free of any abrupt speed changes). When used with Tascam digital multi-tracks such as the DA-88 this
in turn allows the TDIF input decoding circuitry in Pyramix to properly decode the digital audio data at all times
without disruptions while the complete system follows the actual master speed changes.
Driving the pyramix with the LTC output of the DA-88 is maybe possible in some situations but will demonstrate
several limitations which should not occur if you precisely follow the recommended setup as described above.
Keep in mind that the DA-88 does exhibit big instantaneous 1000 PPM (0.1%) speed changes and this prohibits
proper TDIF decoding at the other end.

Dubbing Mode

This mode is provided principally for film re-recording. It allows Tracks to be Armed or Disarmed for recording
while recording is taking place.
Dubbing Mode is selected via All Settings > Settings > Project > Record
Enable Dubbing
When checked, Dubbing Mode is engaged.
Confirm Track Arming
Only available when Dubbing Mode is selected in the adjacent check box. A check in this box means that any
changes to Track arming made whilst recording must be confirmed by a new Record command before they will
take effect.
Example
When recording a final mix in stems (E.g. Dialogue, Effects and Music) you may well wish to retain a previous take
for, say Effects, until a certain point. This can be achieved by arming the Dialogue and Music Track Groups, playing
the transport and punching into record at the desired point. Once in record, the Effects Track Group can be
dropped straight into record at the appropriate moment by simply arming it, or if the Confirm Track Arming box
is checked, by arming it and, applying a second record command when you wish to begin recording. (either on
screen or via MMC, 9-pin etc.)

Virtual Tape Mode

This media format type / mode allows real destructive punches to be made directly into BWF files.

Virtual Tape Format

A separate application allows a Virtual Tape to be prepared.
Cinema projector follows mains (or is crystal controlled) and sends biphase signal to a Biphase -to
LTC converter. (E.g. the Rosendahl BIF)
Converter's LTC output is directly fed to Pyramix LTC input
Pyramix is set to "LTC sync" mode and will adapt it's own internal clock to sync to LTC whenever the
Pyramix is set to lock and the external LTC is recognized to be playing at about 1x forward speed.
Pyramix feeds it's own clock to the DA-88 (or similar machine used as an A/D converter) via Word-
clock.
The DA-88 (or equivalent) is set to sync to external Wordclock
The DA-88 in turn provides the Pyramix TDIF daughtercard input with digital audio data.
Applications : LTC sync 20 - 464