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in the dubbing theatre and digital audio is used when the negative is made. Extra care
must be taken.
I f NT S C video sync is used in the dubbing theatre, it is very important that the
master tapes are pre-striped with 30 non-drop frame timecode at 60Hz. T his will then
mean that the timecode track, control track and A/D converter are all running at the
same speed, second for second. 30 frames of code for 44100 samples and 24 frames
of picture. During recording of the master, the machine must be "pulled down" using
the Fs shift function. T his has the effect of locking the A/D converter with the NT SC
29.97 fps video input. T his means that the machine transport, the timecode and the
A/D converter will all run slow. 29.97 fps and 44.056kHz. T he projector in this case will
be running at 23.96 fps. T herefore 24 frames of picture will still equal 44100 samples.
NEVER stripe at 29.97 NDF. T he "seconds" of the NDF code will be of longer duration
than the "seconds" of the control track. T herefore 44100 samples of audio will not
equal 30 frames of code and 24 frames of picture.
Obviously, if a 48kHz master is required, then similar rules apply, but the recording
sampling frequency would be 47.952kHz in this case.
2.3
Mult i-f or mat pr int mast er s
T he SDDS format has been carefully designed to enable it to fit in well with other
digital audio print master sessions, as the monitoring standards are compatible. T he
RMS pink noise at -20dBfs specification is the same as DT S and SRD, however some
small differences may be found with SRD due to historical RMS measurement
techniques. T his is currently being addressed by Dolby and shortly all formats will be
within 0.5dB. T o save time at the session, the SDDS master can be taken as a parallel
feed and all masters can be recorded at the same time. However it is very important
that the SDDS master is then played back with picture to check for errors.
2.4
For eign language pr int mast er s
Normally the procedure is to record the master along with all other formats as above,
then, if time is short, to use the SDDS master to make the LtRt. T his fold-down
process is not ideal for monitoring the master, but allows the SDDS master to be
checked to some extent. I deally a separate playback pass should be made (clones can
be made at this time, perhaps).
2 Notes, Hints and T ips
SDDS Print Master G uidelines, Page
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