Hi Actually I have the 70's beat by a decade in terms of playing with home made ECG gear….
Bob On Feb 20, 2013, at 2:39 AM, Ed Breya <[email protected]> wrote: > If you only need cardiac pulse rate, an optical pulse-oximeter type interface > - but without the oximetry part - would be much simpler than an ECG system, > and it doesn't need galvanic connection. If you need more than that, then ECG > methods should suffice. > > Back in the 1970s, there was a lot of interest in biofeedback and TM > techniques, using ECG and EEG. Common feedback signals were sound and light > related to the detected physiological signals. A chart display is a good > visual feedback with dynamics too, and it records the events for further > study, so you can investigate the QRST details and whatever else is > interesting. Detecting and processing the signals is nearly trivial now with > modern electronics - it wasn't even that hard back then. If you study what's > transpired over the last forty years, you'll get a pretty good idea of the > whole history of the field, and the technologies involved. Nowadays of > course, the PC can take care of most of the processing and feedback/indicator > functions. > > For a DIY, I'd recommend for each channel run the high-gain instrumentation > amplifier into a V-F or FM converter to translate the signal into a workable > frequency range like a few hundred Hz, then use a sound card and SW to > post-process. Copy front-end interface ideas from the real stuff - > professional medical equipment - to make sure it's safe to hook up to your > own hide. If you don't need absolute details, you can AC-couple the > physiological signals into the V-F process with appropriate time constants, > to avoid the drift, and average in SW. > > I doubt that interest in this area has waned over the decades, so it's likely > there are all kinds of cooler, newer stuff available off-shelf, so you may be > able to find it ready to go - and even way beyond what you had in mind. > > Ed > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
