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6
SR Motion (With HKSR-9002 Installed)
Chapter
Overview
The SR Motion functions of HDCAM-SR allow
you to obtain slow and quick motion effects in
high-quality, high-resolution full HD
(1920×1080). By selecting the number of frames
to shoot (the number of frames recorded each
second), you can obtain slow and quick motion
effects on playback. You can review the motion
effects immediately after shooting. Since only the
required number of frames are recorded to tape,
no format conversion is needed before playback.
SR Motion has the following function.
Function
Features
Select FPS
Provides smooth slow
and quick motion
effects without skipped
frames. Changing the
number of frames to
extract during
recording provides
motion effects with
variable speeds (Ramp
function).
Interval
Provides slow and
Frame
quick motion effects
without afterimaging.
Changing the number
of frames to extract
during recording
provides motion effects
with variable speeds
(Ramp function).
Notes
• The optional HKSR-9002 Picture Cache Board is
required to use SR Motion.
• Audio signals are not recorded correctly during SR
Motion recording.
Overview of SR Motion
Recording/Playback
SR Motion allows you to obtain motion effects by
setting the number of frames at shooting time to a
different value than the number of frames in the
recorded material (number of frames at playback
time, target frame frequency).
Target frame frequency
Normally, the frame frequency of recorded
material is set before shooting. For example, it is
usually 24 Hz for movies, and usually 29.97 Hz or
25 Hz for TV programming.
After shooting, when the material is played back,
it is played at that set rate. In SR Motion, the
number of frames per second in the recorded
material is called the "target frame frequency".
SR Motion achieves motion effects by
appropriately setting three variables: the "target
Reference
frame frequency", the "system frequency" at
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shooting time, and the "number of frames shot" at
shooting time.
In SR Motion shooting, you can obtain slow or
quick motion effects by recording with a system
frequency or number of frames set to a value
different from the target frame frequency. If you
record with the system frequency and the number
of frames set to the same value as the target frame
frequency, normal speed video can be obtained.
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Examples of how to use SR Motion
Example of slow motion
This example describes shooting and recording
with Select FPS function at the system frame
frequency of 50P, and playback at the system
frame frequency of 23.98PsF. When video shot
and recorded at 50 frames/second (FPS) is played
back at 24 FPS, it is played back in slow motion
at 24/50 = 0.48 times normal playback speed. If
you set the format for recording according to the
target frame frequency (system frequency at
playback), the timecode can continuously
advance during playback. The recorded tape can
Overview
101
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