Sony SDDS Print Master manual 1.3Synchronisation

1 SDDS Print Master Format

1.3Synchronisation

Sampling frequency 44.1kHz. i.e. 44100 samples for every 24 frames of picture. 48kHz can be used, but this will be sample-rate-converted in the camera. Make sure the box is CLEARLY marked if the master is at 48kHz.

T imecode 25 frames per second, referenced to 50Hz, film speed 24 fps

Or 30 frames per second, non drop frame, referenced to 60Hz, film speed 24fps NOT E: For NT SC referenced mixing, the master tape must be pre-striped at 30fps/60Hz, then “pulled down” on the mixing stage to 29.97fps NT SC sync with 44.056kHz sampling frequency. I n this case the film speed is 23.98 fps.

T imecode must be referenced to the digital audio. Reel 1 = 1 hour start, reel 2 = 2 hour etc.

Head pop/sync pip should start two seconds or 3 feet before the first frame of picture. e.g. for reel 1, pip at 1:00:06:00, first frame at 1:00:08:00.

1.4Audio and levels

Operating level is –20dBfs. Wide band pink noise at the same RMS value as this will produce the following SPLs in the cinema. Please note, to compare levels of tone and pink noise, a true RMS voltmeter must be used. Console meters will read differently for tone and pink noise.

Channel	SPL C-Weighted measurement
LEFT	85
LEFT CENT RE	85
CENT RE	85
RI GHT CENT RE	85
RI GHT	85
SUBWOOFER	Approx 91 see*
LEFT SURROUND	82
RI GHT SURROUND	82

*T he subwoofer channel has 10dB of in band gain. For a full explanation of this, see the “Subwoofers” section on page 21.

T ones should be recorded on all used channels at the head of each reel. 30 seconds each of 1kHz at –20dBfs, and pink noise at the RMS level of the 1kHz tone.

Surround delay is set in the cinema processor. No delay on the master.

Overlap. 2 seconds or 3 feet of audio from the subsequent reel must be recorded after the end of the reel. T his can optionally end with a tail pip.

A/D conversion. No audio pre-emphasis.

SDDS Print Master Guidelines, Page 5 of 26