Simple Automatic Threshold Generation for Embedded Systems

RE: Simple Automatic Threshold Generation for Embedded Systems

satyavrat — Wed, 22 Mar 2017 14:37:43 GMT

[mention:b0bc65b9ecdc4307bd967592f00e340a:e9ed411860ed4f2ba0265705b8793d05][mention:4966e6ad97f64dac9ea8919abb220e1d:e9ed411860ed4f2ba0265705b8793d05]

Thank you for your suggestions! I'm actually working on a project which will require a dynamic thresholding method. This was my attempt at designing an algorithm that would serve the purpose! I'll surely look into both your suggested algorithms and see what I can learn!

RE: Simple Automatic Threshold Generation for Embedded Systems

shabaz — Tue, 21 Mar 2017 02:07:57 GMT

Interesting post : )

In the analog world this is a common task, for example when trying to decode a bitstream with out-of-band noise especially a low frequency offset or DC offset.

There sometimes they use a 'slicer' which is basically comparing the input signal with an averaged (low-pass) signal derived from the input signal, e.g. just a RC filter.

RE: Simple Automatic Threshold Generation for Embedded Systems

DAB — Mon, 20 Mar 2017 20:27:38 GMT

Setting thresholds is always an issue.

I found that the simplest method is a running filter, usually eight samples, which you average.

You then set the threshold at some value above the average so as the noise gets worse, you detect less.

Now if you really need a good dynamic filter, you use an adaptive algorithm. Look for work by Dr. Peter Raeth. He and I wrote a number of papers on this technique a while back.

DAB