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1 SDDS Print Master Format
SDDS Print Master Guidelines, Page 5 of 26
1.3
Synchronisation
Sampling f r equency 44.1kHz. i.e. 44100 samples for every 24 frames of picture.
48kHz can be us ed, but this will be s ampl e- r ate- conver ted i n the camer a. Make s ur e
the box is CLEARLY marked i f the mas ter is at 48kHz.
T imecode 25 frames per second, referenced to 50Hz, film speed 24 fps
Or 30 frames per second, non drop fr ame, referenced to 60Hz, film speed 24fps
NOT E: For NTSC r ef er enced mi x ing, the mas ter tape mus t be pr e- s tr i ped at
30fps/60Hz, then “pulled down” on the mi xing s tage to 29.97fps NTSC s y n c wi t h
44.056kHz sampling fr equency. In this case the film speed is 23.98 fps.
T imecode mus t be r efer enced to the di gi tal audio.
Reel 1 = 1 hour start, reel 2 = 2 hour etc.
Head pop/ sync pi p should s tar t two s econds or 3 feet before the fir s t frame of
picture. e.g. for reel 1, pip at 1:00:06:00, first frame at 1:00:08:00.
1.4
Audio and levels
Oper ating level is –20dBfs. Wide band pi nk noise at the s ame RMS value as this will
produce the following S PLs in the ci nema. Please note, to compar e level s of tone and
pink noise, a t r ue RMS voltmeter must be us ed. Console meter s will read di fferently for
tone and pi nk noise.
Channel SPL C-Weighted measur ement
LEFT 85
LEFT CENTRE 85
CENT RE 85
RI GHT CENTRE 85
RI GHT 85
SUBWOOF E R Appr ox 91 see*
LEFT SURROUND 82
RI GHT SURROUND 82
*T he s ubwoofer channel has 10dB of in band gai n. For a f ull explanation of this, see
the “S ubwoofer s ” s ection on page 21.
T ones should be r ecor ded on all used channels at the head of each reel . 30 seconds
each of 1kHz at –20dBfs, and pink noise at the R MS level of the 1kHz tone.
Surround delay is set in the cinema pr ocessor. No delay on the mas ter .
Overlap. 2 seconds or 3 feet of audio fr om the s ubs equent reel must be r ecor ded
after the end of the r eel . This can optionally end wi th a t ail pip.
A/D conversion. No audi o pr e-emphas i s.