I want to calculate First HPF and then FFT of an acceleration data for which I use the following code.

```
# Make Function
def filter(s):
# Signal after HPF
fc = 0.1
b = 0.08
N = int(np.ceil((4 / b)))
if not N % 2: N += 1
n = np.arange(N)
sinc_func = np.sinc(2 * fc * (n - (N - 1) / 2.))
window = np.blackman(N)
sinc_func = sinc_func * window
sinc_func = sinc_func / np.sum(sinc_func)
# reverse function
sinc_func = -sinc_func
sinc_func(int((N - 1) / 2)) += 1
#s = list(df(' acc.y'))
new_signal = np.convolve(s, sinc_func)
a=np.fft.fft(new_signal)
return a
```

The question is this returns an array now I want to calculate the **single-valued** Magnitude of this Numpy ie I need the Magnitude for the signal whose FFT i calculate