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Video Sync Pulse Polarity — Parallax Forums

Video Sync Pulse Polarity

Vega256

Vega256 Posts: 197

2011-03-29 13:15 edited 2011-03-29 14:08 in Propeller 1

Hey Guys,

Does any one know the polarity of the sync pulses that the Propeller generates in order to produce a composite video signal?

Comments

Phil Pilgrim (PhiPi) Posts: 23,514

2011-03-29 13:28 edited 2011-03-29 13:28

The sync pulses are negative, when compared to the black level.

-Phil
Vega256 Posts: 197

2011-03-29 14:07 edited 2011-03-29 14:07

In general, does any portion of video signal go below 0V?
Phil Pilgrim (PhiPi) Posts: 23,514

2011-03-29 14:08 edited 2011-03-29 14:08

Not if it's DC-coupled.

-Phil

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