butterworth filter

Hello, I am an italian cardiologist and with the help of other coders from RAC I made a nice VB6 program to analyze digitally stored ElectroCardioGrams. I use this program for educational purposes. One of the most interesting aspects of ECG analysis is linked to ECG signal filtering. To analyze the impact of different filters to the appearance and diagnostic relevance of filtered ECG recordings I use (so far) the computations provided by this Web site: [url removed, login to view]~fisher/mkfilter An example: Specifying these parameters: filtertype = Butterworth passtype = Bandpass order = 2 samplerate = 300 corner1 = 1 corner2 = 40 I get from the Web site these "coefficients" written in C code: #define GAIN 9.413148578e+00 static void filterloop() { for (;;) { xv[0] = xv[1]; xv[1] = xv[2]; xv[2] = xv[3]; xv[3] = xv[4]; xv[4] = next input value / GAIN; yv[0] = yv[1]; yv[1] = yv[2]; yv[2] = yv[3]; yv[3] = yv[4]; yv[4] = (xv[0] + xv[4]) - 2 * xv[2] + ( [url removed, login to view] * yv[0]) + ( 1.5285630711 * yv[1]) + ( [url removed, login to view] * yv[2]) + ( 2.8764697661 * yv[3]); next output value = yv[4]; } } Although I don't know C code, the routine is easy enough to be translated in VB6. Well, in my program I already wrote some routines with already defined filtering criteria, but I wish I could make the computations of the Butterworth filter at runtime, changing the corner frequencies and getting the corresponding coefficients. This way I could evaluate the impact of different filters of the ECG morphology without the need to stop the program, copy the coefficients from the Web site, paste them, an so on. I hope you can help me. Thanks in advance. Dario Barbieri

## Deliverables

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## Platform

Windows XP Visual Basic 6

Habilidades: Vale Tudo

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