Another thing they do in the rate algorithms is make sure each beat falls in accordance with the previous 3 or 4 beats.
Sent from mobile On Feb 20, 2013, at 6:02 AM, Bob Camp <[email protected]> wrote: > 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. _______________________________________________ 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.
