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. 2020 Oct 9;22(10):1141. doi: 10.3390/e22101141

Figure 4.

Figure 4

(a) Frequency response of filter 3, created in the frequency range 8–13 Hz using empirical wavelet function. (b) Frequency response of filter 4, created in the frequency range 13–30 Hz using empirical wavelet function. (c) Frequency response of filter 5, created in the frequency range 30–75 Hz using empirical wavelet function. (d) Frequency response of filter 6, created in the frequency range 75–256 Hz using empirical wavelet function.