Grass Valley PDR v.2.2 - Manual (Page 65)

Analog Composite Video Input Vertical Interval
Profile Family 47
For each Video Line, position the slider pointer to one of the following:
• Normal indicates the vertical interval video line is passed-through.
• Notch applies notch filtering to the vertical interval video line (chrominance
information and any luminance around the chroma subcarrier are removed).
• Pass On Y passes luminance information straight through. This is useful for
VITC and closed-caption or data filtering.
• Delete removes the vertical interval video line and replaces it with black.