Sony SDDS Print Master Manual do Utilizador descarregar pdf (Página 8)

2 Notes, Hints and T ips

SDDS Print Master Guidelines, Page 8 of 26

in the dubbi ng theatr e and di gi tal audio i s used when the negati ve i s made. Extra car e

must be taken.

If NT S C v i deo sync is used i n the dubbi ng theatr e, it is very important that the

master tapes are pr e- s tr i ped wi th 30 non-drop fr ame ti mecode at 60Hz. This will then

mean that the ti mecode tr ack, control track and A/D converter are all running at the

same s peed, second for second. 30 frames of code for 44100 samples and 24 frames

of picture. During r ecor di ng of the mas ter , the machi ne mus t be “pulled down” using

the F s shift function. This has the effect of locking the A/D converter with the NT S C

29.97 fps video input. This means that the machi ne tr ans por t, the ti mecode and the

A/D converter will all run slow. 29.97 fps and 44.056kHz. The pr oj ector in this case will

be r unning at 23.96 fps. Therefore 24 frames of picture will still equal 44100 samples.

NEVER stripe at 29.97 NDF. T he “s econds ” of the NDF code will be of longer duration

than the “s econds ” of the contr ol track. Therefore 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 appl y , but the r ecor di ng

sampling fr equency would be 47.952kHz in this case.

2.3

Mult i-format print masters

T he S DDS format has been carefully designed to enable i t to fi t in well with other

digital audio pri nt master sessions, as the moni tor i ng s tandar ds are compati ble. T he

RMS pink noise at -20dBfs specification is the s ame as DTS and S RD, however some

small differences may be found wi th SRD due to his tor ical RMS measurement

techniques. This is currently being addr essed by Dolby and s hor tl y all formats will be

within 0.5dB. To s ave ti me at the s ession, the S DDS master can be taken as a par allel

feed and all masters can be r ecor ded at the s ame ti me. However it is very important

that the S DDS master is then played back with picture to check for errors.

2.4

Foreign language pr int masters

Normally the pr ocedur e i s to r ecor d the mas ter along with all other formats as above,

then, if time i s short, to us e the S DDS master to make the L tR t. This fold-down

process is not ideal for monitoring the mas ter , but allows the S DDS master to be

checked to s ome ex tent. Ideally a s epar at e pl ayback pass should be made (cl ones can

be made at this time, perhaps).

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