ECG signal processing algorithm

Hi everyone, I am wondering if anyone can help me with DSP algorithm to extract different components of the ECG signal, like the QRS, P or T waves
On the other hand, I tried using piezoelectric microphone/sensor to obtain heart signal, however, I got some sort of signal (see attachment) that is neither ECG nor heart sound. I am wondering if anyone knows what is this signal called.
Thank you

One way to extract the various waves (pqrst) would be to differentiate the wave form and detect zero crossings and therefore detect the various peaks and troughs. Combing this data with zero crossings and amplitudes on the original data should enable you to identify the various points.

Simple integration can be done by subtracting the current value from the previous one.

Mike.
P.S. I found this interesting diagram at This Page.
**broken link removed**

Thanks

Thanks Mike, I will try it out and see how it goes. The waveform in the link you give me is an ECG signal, but the output of my piezoelectric sensor does not resemble it. I am wondering maybe if you have any idea what waveform is that in my attached picture.

Darwin

AFAIK , the PQRST belongs to the ECG signal(electrical impulses) , yours is the audio signal of the heart beat.