[PyQt] Assign Label Text as number in Hz

[DeaD_EyE]

Hello, I can only help a bit with signal processing.
Instead of making a fft and throwing the negative frequencies away, you should do a rfft.

Here a corrected version and additional the same with a rfft.

def getFFT(data, rate):
    """Given some data and rate, returns FFTfreq and FFT (half)."""
    window_size = len(data)
    data *= np.hamming(window_size)
    fft = np.fft.fft(data).real
    freq = np.fft.fftfreq(window_size, 1.0 / rate)
    half_size = slice(None, window_size // 2)
    return freq[half_size], fft[half_size]


def getRFFT(data, rate):
    """Given some data and rate, returns RFFTfreq and RFFT."""
    window_size = len(data)
    data *= np.hamming(window_size)
    rfft = np.fft.rfft(data).real
    freq = np.fft.rfftfreq(window_size, 1.0 / rate)
    return freq, rfft