Setting the 3-2 Pulldown, Pulldown auto setting

Setting the 3-2 Pulldown

Encoding image film material

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)

3-2 Pulldown auto setting

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.

Film

1st scene

2nd scene

3rd scene

4th scene

HDTV VTR	Field	Field	Field	Field	Field	Field Field		Field	Field	Field
	1	2	1	2	1	2	1	2	1	2
	Frame 1		Frame 2		Frame 3		Frame 4		Frame 5
ENCODER
ENCODER	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.