I am working on ECG Compression as a part of that i require IF sampler. Which includes Integrater and Thresholding. I have doubt in Integration as well as in Thresholding. Please help me about this Process
I do not understand if you need to encode from uniform sampling to IF or if you need to decode from IF to a uniform sampling.
However: encoding is very simple.
When you start encoding you set to zero time and integrator counter.
You integrate your discrete signal by making the sum of discrete samples you receive from the machine until you reach the extablished threshold.
At that point you save the time and reset to zero the time as well as the sum.
The less is the threshold the more the decoding will be accurate as well it depends on the rate of samples you create while encoding.
Decoding is a bit less easy.
Dear zoppo
Thanks for your valuable answer
I want to do non-uniform sampling to IF sample because i am going to sample ECG signal
where the first process is integration second process is to differentiate the signal using threshold and the final step is to reset to zero when the threshold is reached
I want to know about how the threshold value is fixed and how the reset value is reached
The treshold depends on the driver design or the elctronics of the acquiring sistem.
But it may strongly depend on the application you need.
If you simply need to count and store the BPM, you may need less samples.
If you are interested at the shape of the heartbeat, Its value should be low enough to resolve al the main parameters of an heartbeat.
However a longer explication of your problem may help me to help you better.
Onset and reset threshold will depend on nature of signal, window length and what you want to achieve. In normal course, twice of the average of the signal is used as onset threshold.
- Badges
- Science topic
- Similar topics
- Engineering
- Electrical Engineering
- Electrodes