human
fft low frequency signal.
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Here is a Python function to fft low frequency signal

import numpy as np

def _fft_low_freq(signal):
    """Return the low frequency signal of the given signal.
    This is the signal with the DC component removed.
    """
    return signal - signal.mean()

# Enter the signal
signal = np.array([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])

# Calling the function
low_freq_signal = _fft_low_freq(signal)

print(low_freq_signal)

#Example Output
# [-4.5 -3.5 -2.5 -1.5 -0.5  0.5  1.5  2.5  3.5  4.5]

#Remember to inspect code for bugs.