Sound Devices 664 - Manual (Page 39)

Time code Hold Off
Some devices that send rec-run time code will sometimes have a tendency to send short burst of
running time code. When using time code to trigger recording on the 664 (External time code auto-
record modes) this behavior can result in unintentional recordings on the 664. To eliminate this
problem, the 664 features a Time code Hold Off function.
When using external time code auto-record modes, the 664 will wait (“hold off”) for the amount of
time specified in Setup Menu option TIMECODE/SYNC > Hold Off before beginning recording. Run-
ning time code lasting less than the Time code Hold Off value will not trigger a recording on the 664.
Things to consider when using Time code Hold Off:
• This feature only applies in Ext-TC Auto-Rec and Ext-TC Auto-Rec/Cont.
• If Pre-Roll is set, it will be applied (
see Pre-Roll ). Pre-Roll will only capture audio from the initial
detection of a time code signal. If no Pre-Roll is selected, the file will begin after the Hold Off time
expires. It is best practice to set Pre-Roll, in the Setup Menu option RECORDER > Pre-Roll Time,
to a value greater than the selected Time code Hold Off value. This ensures that audio is captured
from the moment a time code signal is detected and that unintentional files triggered by short
bursts of time code are not generated.
F Sampling Rate Modes
48.048k and 48.048kF
The 48.048kF mode (F stands for fake, faux, Fostex—take your pick) is a specific compatibility mode
for use with the Fostex DV40 software (1.74 and previous), Avid, Final Cut Pro, and other post-pro-
duction environments that do not recognize audio files written at 48.048 kHz. In this mode files are
recorded at a 48.048 kHz sampling rate but are stamped at 48 kHz. When played, they will play back
0.1% slower than real time.
One use for the 48.048kF mode is to force a 0.1% speed reduction (pull down) of audio to match
MOS-telecined film (24 fps-to-NTSC) in non-linear edit systems, such as Avid or Final Cut Pro. Since
the file is stamped as a 48 kHz file, the edit system will play it back at 48 kHz and not at 48.048 kHz.
This “audio pull down” will match the transferred picture without the need for an intermediate step
through other software to create the pull down.
The time code frame rate (actual recording rate) is forced to 30 ND in 48.048kF mode. The LCD dis-
play will show 30 ND during recording. No other frame rate is available in 48.048kF mode.
664 User Guide and Technical Information
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