Nagra Seven Operating Instructions Manual page 66

30 fps:
30 df:
In Cinema applications always verify with the post production facilities which frame rate should be used prior
to starting the recording.
It is important to know, that inside the Nagra Seven the time code system is locked to the sampling frequency
selected for the digital recording. The sampling frequency depends on the reference frequency selection
(usually "Master" in a stand-alone situation). This means, for example, that if the sampling frequency is set to
48 kHz and the reference frequency is set to "Master + 0.1%", and the time code is set to the 23.976 frame
rate then the result will be a file with a sampling frequency of 48'048 kHz and a time code of 24 fps, which is
suitable for slow-down from 30 fps to 29.97 to render a sampling frequency of 48 kHz for NTSC applications.
If the machine is clocked by an external digital clock frequency, then the internal time code generator will
follow this external clock and this guarantees a perfect coherence between the audio sampling frequency and
the time code. The time code system of the Nagra Seven is able to follow variations in the external clock of up
to ±4%
When using an external clock this coherence will remain perfect as long as the machine is still powered. If the
machine is switched off, then when restarted, it will take the time code from the internal RTC based on its
internal reference.
Time code can be recorded in either the "Time of day" mode or can be set to any arbitrary value by the user.
All the time code settings are made in the menu mode.
Chapter IV
NTSC black and white frame rate (typically countries with 60 Hz mains supply). It
should be used if the audio (and pictures) are to be transferred to NTSC video for
editing purposes.
This frame rate uses the drop frame compensation system at 30 frames per second.
It allows audio to be slowed down by 0.1% and remain compatible with the NTSC
color television system. It is not often used and the count is 0.1% faster than real
time.
65 March 2014