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'BTC stuff'
2003\05\07@191840 by David Harris

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Hi Des-
Can I have details of your code for the BTC stuff? -- I am just getting
to the stage of giving it a try myself.
David


Des Bromilow wrote:

{Quote hidden}

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2003\05\07@192921 by Des Bromilow

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David,

All I have is the code from Roman's website... my own modifications, I will not release until I know they work (I've had hiccups with IIC, and flow control of the program) Once I get my device working, I'll be happy to send it all out, but until then I worry any errors in my code will simply complicate the issue.

Des

>>> .....dpharrisKILLspamspam@spam@TELUS.NET 8/05/03 9:19:40 am >>>
Hi Des-
Can I have details of your code for the BTC stuff? -- I am just getting
to the stage of giving it a try myself.
David


Des Bromilow wrote:

{Quote hidden}

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2003\05\07@193407 by Dave VanHorn

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At 04:19 PM 5/7/2003 -0700, David Harris wrote:
>Hi Des-
>Can I have details of your code for the BTC stuff? -- I am just getting
>to the stage of giving it a try myself.

I'm curious as well, what is this?

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2003\05\07@194002 by David Harris

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Dave et al-
Original idea and implimentation by Roman Black -- website is:
centauri.ezy.net.au/~fastvid/picsound.htm
<centauri.ezy.net.au/%7Efastvid/picsound.htm>
David

Dave VanHorn wrote:

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2003\05\07@194011 by Scott Dattalo

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On Thu, 8 May 2003, Des Bromilow wrote:

> David,
>
> All I have is the code from Roman's website... my own modifications, I will not release until I know they work (I've had hiccups with IIC, and flow control of the program)
> Once I get my device working, I'll be happy to send it all out, but until then I worry any errors in my code will simply complicate the issue.


You may want to look at this Octave (Matlab) script:

http://www.dattalo.com/swsd.m

There's a decent description of the theory behind the process.

Here are few plots illustrating the results:

http://www.dattalo.com/p2.png
http://www.dattalo.com/p3.png
http://www.dattalo.com/p4.png

I haven't written any pic code to test this stuff out.

Scott

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2003\05\07@194615 by David Harris

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Scott-
This is great - as usual you come through with the theoretical.  Are the
synthesized plots before filtering, and the filtered after filtering?  I
think I like the synthesized ones better.
Now I will have to look into  Octave.
David

Scott Dattalo wrote:

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2003\05\07@195736 by Scott Dattalo

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On Wed, 7 May 2003, David Harris wrote:

> Scott-
> This is great - as usual you come through with the theoretical.  Are the
> synthesized plots before filtering, and the filtered after filtering?  I
> think I like the synthesized ones better.
> Now I will have to look into  Octave.

There are 3 sine waves in the plot: The ideal, synthesized, and filtered.
The ideal is an analog signal that the DAC is targeting. The synthesized
is the signal that the DAC thinks it's generating. The filtered is the
signal that you'd see on a scope. For the filter, the script assumes a
simple RC filter. The difference between p2.png and p4.png are due to a
different RC filter. (I don't recall which RC corresponds to which plot)

p3.png is a close up of the waveforms.

Octave is nice if you're familiar with MATLAB. However, if I was starting
from scratch, I'd consider Python instead.

Scott

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2003\05\07@200409 by Herbert Graf

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Very neat, unfortunately it looks like it doesn't work on win2k. Doh...

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2003\05\07@202648 by David Harris

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Hi-
I just played with it on Win98 --
For the example, I found 24750 ohms and 0.01uF came out best.
Now, what if we have an active circuit on the output, as we will
probably have to buffer the signal anyway -- can we do better?
David

Herbert Graf wrote:

>Very neat, unfortunately it looks like it doesn't work on win2k. Doh...
>
>
>
>>{Original Message removed}

2003\05\07@203532 by Scott Dattalo

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On Wed, 7 May 2003, David Harris wrote:

> Hi-
> I just played with it on Win98 --
> For the example, I found 24750 ohms and 0.01uF came out best.
> Now, what if we have an active circuit on the output, as we will
> probably have to buffer the signal anyway -- can we do better?

Sure!

If you have an ideal integrator then you can simplify the software
algorithm. It's much easier for a PIC to predict the output of an
integrator than an RC circuit when a step function is applied to the
input.

Scott

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2003\05\07@204717 by David Harris

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Scott Dattalo wrote:

{Quote hidden}

Hi-
What about a filter with positive feedback or would that be unstable --
also, if you could - how do you modify your script to handle three
cases?   (you can see I've had no formal electronics/engineering
training :( )
David

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