Sony SDDS Print Master manual Sdds Print Master Guidelines, Page 8

2 Notes, Hints and T ips

in the dubbing theatre and digital audio is used when the negative is made. Extra care must be taken.

I f NT SC 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

29.97fps 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.

2.3Multi-format print masters

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.

2.4Foreign language print masters

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).

SDDS Print Master Guidelines, Page 8 of 26