Ideas on pure analogy QRS detector

[biomed_man]

qrs detector

Hey,

Does anyone have any ideas on how to design a pure analogy QRS detector?

was thinking of something like this.....

Say if R peak = 1mV
With both P and T <1mV
Assume a gain of around 1000 with the ECG amp output.

Use a multiplier to multiply out the P and T to nothing, with no change in the QRS wave. I.e. Vin^4 = Vout

Then a half wave rectifier and a comparator to flatten out the pulse, and give it the +5V characteristics.

Is there a simpler way?

 

[D_A_V_E]

simple qrs detection code

use a software QRS detection!

Its easy to do. If you need code tell me! Its the tompkins QRS detector

 

[biomed_man]

tompkins qrs detection code

Its has to be analog..... its a prac for a class (software is easy)

 

[springbuterflay]

why qrs detection

excuse me i need tompkins QRS detector

 

[ajay_bharadwaj]

qrs tomkins

Please send the QRS detector code.

thanks

 

[akss_here]

tompkins+qrs

tompkins QRS detector paper

HAPPY

 

[rbardwell]

The hardware way to do that is a peak detector---in the old days was usually done with an op-amp **broken link removed**- analgous to a noise gate in the audio world - uses the R wave as a trigger if you want like a TTL pulse. In the old days this would drive a rate meter that would average over 8-16 beats. The downside to the hardware method is that tall T waves as is the case with hyperkalemia tend to double count and throw the HR off. Better to do in software but then it gets complicated in many ways. There is actually an open source QRS detector out there at http://www.eplimited.com/software.htm