python-scipyHow do I use Python and SciPy to apply a high pass filter?

The SciPy library provides a variety of functions for applying high pass filters. To use Python and SciPy to apply a high pass filter, first import the necessary SciPy library functions:

from scipy import signal

Next, define the filter parameters. For example, to create a high pass filter with a cutoff frequency of 0.1 Hz and a filter order of 4:

cutoff = 0.1
order = 4

Then, use the butter function from the signal module to create the filter:

b, a = signal.butter(order, cutoff, btype='highpass')

Finally, apply the filter to a given signal using the lfilter function from the signal module:

filtered_signal = signal.lfilter(b, a, signal)

The filtered_signal will contain the filtered signal with the high pass filter applied.

Code explanation

• from scipy import signal: imports the SciPy library functions necessary for applying high pass filters.
• cutoff = 0.1: defines the cutoff frequency of the filter.
• order = 4: defines the filter order.
• b, a = signal.butter(order, cutoff, btype='highpass'): creates the filter.
• filtered_signal = signal.lfilter(b, a, signal): applies the filter to the given signal.

Helpful links

• scipy.signal.butter
• scipy.signal.lfilter

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