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TP 113 v. 2.1 • 2/93
LD-V8000 Level I & III User’s Manual
44)
SELECT PLAYBACK FIELD
Function:
Selects the field from which interleaved video playback is started.
NOTE:
Both the RM and IM commands are used in
Interleaved
Video Playback
,
Frame Mode
, and
Field Mode
.
Format:
Integer
I M
Explanation:
This command indicates the field from which interleaved video
playback is started. Integers 0-127 can be selected. See
Appendix H, Interleaved Video Playback
, for details.
Execution:
* Initial Condition: Memory Control OFF, Frame Mode Selected
18RG 1RM 2IM 1AD 1SE 500PL <C/R>
R <C/R>
*
Interleaved Video Playback, Field Mode
is selected, Select Frame
Interval is set to play every other Frame. “Select Playback Field” is
set to play back the first field of every second frame, Audio
channel 1 is ON. Search to the beginning of the program material
at Frame 1, play back the first field of every second frame starting
at Frame 2, up to Frame 500.
NOTE:
When Field 1 of every other frame of video is played, the player plays Field 1 of
Frame 1, holds that field in it’s memory and displays it, then displays it again for a
second field time. Then Field 1 of Frame 3 is held in memory and displayed two field
times, and so forth, through Frame 5,7, 9 etc. This allows the player to play at a
constant rate of 30 frames per second and put out un-interrupted audio from channel 1
or 2 to accompany the interleaved video playback. (The player is actually playing
through the full frame, while holding one field in memory. Audio is output without
interruption.)
NOTE:
One Frame = 1/30th of a second; One Field = 1/60th of a second.
Interleaved Video Playback Program Example
Three different programs are laid down on tape in interleaved fashion and encoded to LaserDisc for
interleaved access using the
Interleaved Mode
control commands.
Here are some sample commands for
Interleaved Playback
. The RM command indicates how many
Frames to skip; the IM command indicates the field on which playback will start.
Frame Mode, playback every frame, skipping no fields:
2RG
0RM 0IM 1SEPL
Plays back A1 B1 C1 A2 B2 C2 A3 B3 C3, etc.
Frame Mode, playback every 2nd frame, skipping 2 fields:
2RG
1RM 2IM 1SEPL
Plays back B1 B1 A2 A2 C2 C2 B3 B3, etc.
Frame Mode, playback every 3rd frame, skipping 4 fields:
2RG
2RM 4IM 1SEPL
Plays back C1 C1 C1 C2 C2 C2 C3 C3 C3 etc.
Chapter Four • LD-V8000 Level I & III
SELECT PLAYBACK FIELD
Fld 1
Fld 2
Frame A-1
Frame B-1
Frame C-1
Frame A-2
Frame B-2
Frame C-2
Frame A-3
Frame B-3
Frame C-3
Fld 1
Fld 2
Fld 1
Fld 2
Fld 1
Fld 2
Fld 1
Fld 2
Fld 1
Fld 2
Fld 1
Fld 2
Fld 1
Fld 2
Fld 1
Fld 2
Figure 4-R
Frame 1
Frame 2
Frame 3
Frame 4
Frame 5
Frame 6
Frame 7
Frame 8
Frame 9