Tim Wescott <[email protected]> wrote in
news:[email protected]:

> This pretty much confirms my understanding. I've spend the last two
> hours of my day finding a pretty picture of an EKG waveform on the web,
> synthesizing a fake one in SciLab, and filtering it a couple of
> different ways for this article I'm writing. I'm laughing right now
> because right before I read your post I found out that if I filter it at
> about 400Hz it looks pretty good...


I "think" I have an ECG simulator, if I can find it. It was given to me, I
have no idea if it works, and I don't know what kind of batteries it takes.
If I can dig it up, you can give it a go. Alternatively, I might be able
to record some for you, AC coupled at a frequency slightly higher than
what's wise, and no promises re aliasing. I'd use an AD instruments
powerlab, but I need to dig up an accessory pack before I could record
this. It wouldn't be standard clinical EKG lead locations, but leads I,
II, and III on the Einthoven triangle. It might take some time.

If you absolutely need the waveform from long-term acquisition (like a
Holter Monitor), I wouldn't go for lossy compression, but I'd try to dump
the data to a large SD card, or disk. If you just need heart rate, I'd do
some sort of QRS detection using a window discriminator or fancier
technique, and just save the time stamps.


--
Scott
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