My signal graph is as follows
I have < 10 reputation, thus cannot post the photo...
The graph are simply roughly the series of -5, 0, +5, 0, -5, 0, +5, 0.... but with sawtooth-like small peaks around the prominent peaks.
I am going to do the peak detection. But what I need to count is the "prominent peaks".
i.e. The "sawtooth" small peaks around the main peaks should not be counted.
I have known that the small peaks are due to high-freq noises.
My range of interest is 0~4Hz.
Thus, before counting the peak number, I have to low pass filter the signal first.
Being a beginner in signal processing, I have no idea which type of filter is the most proper. Chebyshev or Bessel or the classic Butterworth?
Thanks in advance!