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Fix: normalization of power spectra... #15

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Fix: normalization of power spectra... #15

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5 changes: 3 additions & 2 deletions neurodynex/tools/spike_tools.py
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Original file line number Diff line number Diff line change
Expand Up @@ -297,7 +297,8 @@ def _get_spike_train_power_spectrum(spike_train, delta_t, subtract_mean=False):
N_signal = data.size
ps = np.abs(np.fft.fft(data))**2
# normalize
ps = ps * delta_t / N_signal # TODO: verify: subtract 1 (N_signal-1)?
T_signal = N_signal * delta_t
ps = ps / T_signal # TODO: verify: subtract 1 (N_signal-1)?
freqs = np.fft.fftfreq(N_signal, delta_t)
ps = ps[:(N_signal/2)]
freqs = freqs[:(N_signal/2)]
Expand Down Expand Up @@ -420,7 +421,7 @@ def get_population_activity_power_spectrum(
k_ps = np.abs(np.fft.fft(data))**2
ps = np.mean(k_ps, 0)
# normalize
ps = ps * delta_t / N_signal # TODO: verify: subtract 1 (N_signal-1)?
ps = ps / T_signal # TODO: verify: subtract 1 (N_signal-1)?
freqs = np.fft.fftfreq(N_signal, delta_t)
ps = ps[:(N_signal/2)]
freqs = freqs[:(N_signal/2)]
Expand Down