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user 36591
In signal processing, a filter is a device or process that transforms a signal by selectively choosing specific frequencies and leaving others with appropriate gain or as it is.
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How to correctly set the zi parameter (initial condition) for a scipy IIR filter
Let's take as an example an IIR filter using the 'sos' output, as this is what I use the most. To apply a bandpass filter, you can do:
from scipy.signal import butter, sosfilt
fs = 512 # Sampling rat …
- 213
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vote
1
answer
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Initial conditions for 2 IIR causal filters applied to the same time-series consecutively
This buffer and all the new samples are filtered with IIR causal filters, but different channels might be filtered by different filters. … Assuming I have 6 channels (0-indexed), and 2 filters:
filter1 applied to channels 0, 1, 2, 3
filter2 applied to channels 2, 3, 4, 5
How should I handle the initial conditions zi used for new_data on …
- 213
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1
answer
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Applying a lowpass filter to a noisy square signal leads to a shift of the signal
cutoff, fs, order=5):
nyq = 0.5 * fs
normal_cutoff = cutoff / nyq
b, a = bessel(order, normal_cutoff, btype='low', analog=False)
y = lfilter(b, a, data)
return y
I then call both filters …
- 213
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votes
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answers
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Filtering a square signal with a median filtering to preserve the edges
If needed, you can find my first post for this problem here.
I am trying to clean the following signal:
As proposed in the comment, I tried to use this post proposing 2 methods: median filtering and …
- 213
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votes
1
answer
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Problem wih (diverging?) digital IIR filter for an online acquisition system
I am trying to plot windows of acquired data from an LSL-compatible system. For the example below, let's consider 1-second window of a 64 channel EEG system. In practice, I use shorter 0.2-window, but …
- 213