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PICList Thread
'[OT] Video Sync Delay Device'
1998\04\21@125509 by Harrison Cooper

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OK world, I hate to use the bandwidth again, but with 1700 members, I might
strike gold here.

My company does not have the availble engineers to develop a device that
takes in either sep H/V or a composite sync, and generate two composite
syncs, but one delayed by N number of lines from the other, but still
remain completly in phase.  First, anyone know of a device off the shelf,
and second, any stateside engineering firms done anything similiar to
this and might be able to adapt an existing design?  We are talking about
a complete packaged product here, and about 100 units.

reply to private email  spam_OUThcooperTakeThisOuTspames.com

1998\04\21@131544 by John Shreffler

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part 0 815 bytes
-----Original Message-----
From:   Harrison Cooper [SMTP:.....hcooperKILLspamspam@spam@ES.COM]
Sent:   Tuesday, April 21, 1998 12:54 PM
To:     PICLISTspamKILLspamMITVMA.MIT.EDU
Subject:        [OT] Video Sync Delay Device

OK world, I hate to use the bandwidth again, but with 1700 members, I might
strike gold here.

My company does not have the availble engineers to develop a device that
takes in either sep H/V or a composite sync, and generate two composite
syncs, but one delayed by N number of lines from the other, but still
remain completly in phase.  First, anyone know of a device off the shelf,
and second, any stateside engineering firms done anything similiar to
this and might be able to adapt an existing design?  We are talking about
a complete packaged product here, and about 100 units.

reply to private email  .....hcooperKILLspamspam.....es.com

1998\04\21@185628 by Gennady Palitsky

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>At a hundred units there is no way to develop such a circuit in one device.
>But a combination of a sync detector chip, some counters, a synch generator
>chip, and some glue chips, it would be a snap to put something like that
into
{Quote hidden}

Well, some time ago I asked piclicters to advice on synchronizing PIC to
video (I had jitters in switched video due to those "3-4 cycles interrupt
latency" in PIC).
I've lost a hope to do it with PIC (ordered special crystals, but didn't
have time to wait) and decided to try Scenix. At 14.38MHz crystal (same one
I used for PIC) jitters almost disappeared. Reasons: ~70nS cycle time (280
for PIC) and exactly 5 cycles of interrupt latency.
Just a thought...

Gennady Palitsky
Jefferson Audio Video Systems
EraseMEgennadypspam_OUTspamTakeThisOuTmainlink.net

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