JVC HDTV Encoder DM-JV600U - Manual (Page 26)

26
It is required to convert the video signal (Pulldown) in order to view the image recorded with
24 frames per second such as movie film on a system for HDTV video signal that is 30
frames per second (60 field) used in TV broadcasting. Normally, HDTV VTR utilize 3 - 2
Pulldown (Telecine) method to achieve image signal conversion before recording on tape.
When this equipment is encoding signals which have been recorded with 3 - 2 Pulldown
processing, it is possible to encode by automatically skip 24 frames in order to increase
compression ratio. (Inverse Telecine)
For 3-2 Pulldown method, the odd number frame is converted to 2 fields and the even num-
ber frame is converted to 3 fields. With this feature, it is possible to convert 2 frames into 5
fields which means that 24 frames could be converted into 60 fields.
Setting the 3-2 Pulldown
Encoding image film material
Film 1st scene 2nd scene 3rd scene 4th scene
HDTV VTR
ENCODER
Field
1
Field
2
Field
1
Field
2
Field
1
Field
2
Field
1
Field
2
Field
1
Field
2
Frame 1 Frame 2 Frame 3 Frame 4 Frame 5
Frame 1 Frame 2 Frame 3 Frame 4
When 3- 2 Pulldown under the Operate Param Menu is set to AUTO, input image signals will
automatically be detected for 3 -2 Pulldown processing information, unnecessary fields will
be discarded and only the original 24 frames will be encoded.
3-2 Pulldown auto setting