Video frame grabbers

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Article #20204

#20204

From: John Welch
Date: Tue, 13 Dec 1988 22:04

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Does anyone know of a convenient way to remove the sync pulses from
a NTSC video signal?

I designing a video frame grabber and am having a problem removing
the sync pulses from the video signals.  I have DC restored the blank
level of the signal to ground and need to remove the sync pulses
before I digitize the signal.


                 \                           /
          VIDEO    \                       /      VIDEO
                    \                    /
                     |                   |  <------ black level
                     |                   |
                     | _______     ______| <------ blank level
                              |    |
                              |    | 
                              |____| <------ SYNC tip


The Micropower ADC I am using does not like any input values below
ground.

Any help or information I get would be greatly appreciated.

Please try to e-mail any responses. I will summarize if warranted.

Thanks.

John E. Welch
Compugraphic Corp. 
200 Ballardvale St.
Wilmington Ma, 01887

(508) 658 5600 x7017

..!ulowell!
            >cg-atla!welch
...!decvax!

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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!ncrlnk!ncrcae!hubcap!gatech!bloom-beacon!husc6!m2c!ulowell!cg-atla!welch
From: welch@cg-atla.UUCP (John Welch)
Newsgroups: sci.electronics
Subject: Video frame grabbers
Summary: SYNC stripping anyone?
Message-ID: <6321@cg-atla.UUCP>
Date: 13 Dec 88 22:04:32 GMT
Organization: Compugraphic Corp., Wilmington, Mass
Lines: 40