Texas Instruments MC-780PIx User Manual

Page 24

External Sync With Interlace

3-2

Using the External SYNC Mode

3.1

External Sync With Interlace

On the rear panel, set switch 5 of mode switch SW3 to ON.

3.1.1

External Sync Signal Input Conditions

HD signals: 15.734 kHz

1% (63.5

1%)

VD signals: 262.5 H

Phase

In Figure 3–1, when the last VD transition is between 47.42

s ahead and

16.13

s behind relative to the last HD transition, it becomes the ODD field.

When the last VD transition is between 16.13

s ahead and 47.42

s behind

relative to a 1/2 H point from the last HD transition, it becomes the EVEN field.

Figure 3–1. External Sync Timing

1/2 H

1 H

odd field

even field