M-AUDIO Pro Tools Recording Studio - Manual (Page 1038)

Pro Tools Reference Guide 1020
Example of Auto Match Pull Factors
The Auto Match Pull Factors option links audio
and video pull factors when changing session
frame rate.
For example, assume a Pro Tools session is set to
a frame rate of 25 fps, the audio and video are
both playing with no pull ups, and Auto Match
Pull Factors is enabled.
If you then change the session Frame Rate to
24 fps, both the Audio and Video Rate Pull set-
tings would change by –4.0% (the appropriate
pull setting required by the change in frame
rate).
Auto Match-enabled pull factors are applied to
any existing Audio Rate Pull Up/Down or Video
Rate Pull Up/Down settings.
For example, if audio was already being pulled
–0.1% when you changed the session Frame
Rate from 29.97 to 24 fps, then the Audio Rate
Pull Up/Down menu would switch to None.
Audio Sample Rate Pull Up and
Down
The Audio Rate Pull Up/Down setting applies pull
up or down factors to session audio record and
playback. All pull rates are available, regardless
of session frame rate.
Audio Rates and Pull Up/Down Options
Table 48 lists actual sample rates of each pull up
and pull down option and combination
(rounded to the nearest whole Hz):
See also “Auto Match Pull Factors” on
page 1019.
Table 48. Sample Rates at Pull Up and Pull Down Settings
Pull Up/Down
Sample Rate
44100 48000 88200 96000 176400 192000
+4.1667%
and +0.1%
45983 50050 91967 100100 n/a n/a
+4.1667% 45938 50000 91875 100000 n/a n/a
+4.1667%
and –0.1% 45892 49950 91783 99900 n/a n/a
+0.1% 44144 48048 88288 96096 176576 192192
–0.1% 44056 47952 88112 95904 176224 191808
–4.0% and
+0.1%
42378 46126 84757 92252 n/a n/a
–4.0% 42336 46080 84672 92160 n/a n/a
–4.0% and
–0.1%
42294 46034 84587 92068 n/a n/a