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Don't think it's a good idea to detect the PQRST peaks using hardware. Nowsaday, high end microcontroller or DSP controller is cheap already. Usually we aquire the signal using ADC and detect it in software. My colleague did before. His circuit contained instrumental amplifier (frm TI-BB), 12-ADC (frm Analog Device, 10us conversation time), notch filter (frm TI-BB, to reject AC main frequency), and link to PC.
His circuit grabbed the signal and process using PC. He used AI technique to detect the PQRST peaks. His circuit followed the standard set by American Heart Society (or Organization).
There are many different techniques for QRS detection. Are you looking for papers describing them or reference implementations? I think a lot of things can be found through google!
J. Pan and W. J. Tompkins,
"A real-time QRS detection algorithm,''
IEEE Trans. Biomed. Eng., vol. 32, no. 3, pp. 220-236, 1985.
Ahlstrom, M. L. and Tompkins, W. J. 1985.
"Digital Filters for real-time ECG signal processing using microprocessors",
IEEE Trans. Biomed. Eng. BME-32 708-13
D. T. Kaplan,
"Simultaneous QRS detection and feature extraction using simple matched filter basis functions,''
Computers in Cardiology. 1991, pp. 503-506, IEEE Computer Society Press.
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