Re: Modern Vector demo!

From: MyPearl <mypearl_at_dds.nl>
Date: Wed Aug 08 2007 - 06:23:32 EDT

Well, that doesn't work then...

Tried it on two tek scopes, so that should not be the problem.

----- Original Message -----
From: "Frank Palazzolo" <palazzol@comcast.net>
To: <vectorlist@vectorlist.org>
Sent: Wednesday, August 08, 2007 3:32 AM
Subject: Re: VECTOR: Modern Vector demo!

> MyPearl wrote:
>> Another problem I noticed (and expected) is that the soundcards
>> output is AC coupled and therefore the center of the image
>> on the scope drifts in both x and y direction. Maybe I need
>> to chop up an old soundblaster just for this demo :)
>
> It appears he is offsetting the beam to the four corners of the display
> for certain amounts of time, probably to add the proper "DC offset" via AC
> components. I think this must be how he gets around this limitation of
> sound cards. Otherwise, I can't see how an arbitrary AC-coupled audio
> signal could work.
>
> This is quite an amazing piece of work - both the demo and this technique.
>
> -Frank
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Received on Wed Aug 8 12:27:42 2007

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